Multiple use-after-free vulnerabilities in the (1) htmlPArsePubidLiteral and (2) htmlParseSystemiteral functions in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allow remote attackers to cause a denial of service via a crafted XML document.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libxml2: Use after free via namespace node in XPointer ranges (CVE-2016-4658)

  - libxml2: Missing validation for external entities in xmlParsePEReference (CVE-2017-7375)

  - libxml2 through 2.9.1 does not properly handle external entities expansion unless an application developer     uses the xmlSAX2ResolveEntity or xmlSetExternalEntityLoader function, which allows remote attackers to     cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read     arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be     argued that because libxml2 already provides the ability to disable external entity expansion, the     responsibility for resolving this issue lies with application developers; according to this argument, this     entry should be REJECTed and each affected application would need its own CVE. (CVE-2013-0339)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

According to its self-reported version, the Nessus Network Monitor running on the remote host is prior to 6.2.2. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2023-23 advisory. Several of the third-party components were found to contain vulnerabilities, and updated versions have been made available by the providers. Out of caution and in line with best practice, Tenable has opted to upgrade these components to address the potential impact of the issues. Nessus Network Monitor 6.2.2 updates the following components:

  - c-ares from version 1.10.0 to version 1.19.1.
  - curl from version 7.79.1 to version 8.1.2.
  - libbzip2 from version 1.0.6 to version 1.0.8.
  - libpcre from version 8.42 to version 8.44.
  - libxml2 from version 2.7.7 to version 2.11.1.
  - libxslt from version 1.1.26 to version 1.1.37.
  - libxmlsec from version 1.2.18 to version 1.2.37.
  - sqlite from version 3.27.2 to version 3.40.1.
  - jQuery Cookie from version 1.3.1 to version 1.4.1.
  - jQuery UI from version 1.13.0 to version 1.13.2.
  - OpenSSL from version 3.0.8 to version 3.0.9.

Update to latest upstream release, includes several security related fixes.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Tenable Log Correlation Engine (LCE) installed on the remote host is prior to 4.8.1. It is, therefore, affected by the following vulnerabilities :

  - Multiple cross-site scripting (XSS) vulnerabilities     exist in the Handlebars library in the     lib/handlebars/utils.js script due to a failure to     properly escape input passed as unquoted attributes to     templates. An unauthenticated, remote attacker can     exploit these vulnerabilities, via a specially crafted     request, to execute arbitrary script code in a user's     browser session. (CVE-2015-8861, CVE-2015-8862)

  - A heap-based buffer overflow condition exists in the     Perl-Compatible Regular Expressions (PCRE) component     that is triggered when processing nested back references     in a duplicate named group. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition or the execution of arbitrary code.
    (CVE-2016-1283)

  - An out-of-bounds read error exists in the libxml2     component in parserInternals.c due to improper parsing     of characters in an XML file. An unauthenticated, remote     attacker can exploit this to disclose sensitive     information or cause a denial of service condition.
    (CVE-2016-1833)

  - An overflow condition exists in the libxml2 component in     xmlstring.c due to improper validation of user-supplied     input when handling a string with NULL. An     unauthenticated, remote attacker can exploit this, via a     specially crafted file, to cause a denial of service     condition or the execution of arbitrary code.
    (CVE-2016-1834)

  - Multiple use-after-free errors exist in the libxml2     component in parser.c that is triggered when parsing     complex names. An unauthenticated, remote attacker can     exploit these issues, via a specially crafted file, to     dereference already freed memory and potentially execute     arbitrary code. (CVE-2016-1835, CVE-2016-1836)

  - Multiple heap-based buffer overflow conditions exist in     the libxml2 component in HTMLparser.c and xmlregexp.c     due to improper validation of user-supplied input when     parsing characters in a range. An unauthenticated,     remote attacker can exploit these issues, via a     specially crafted file, to cause a denial of service     condition or the execution of arbitrary code.
    (CVE-2016-1837, CVE-2016-1839, CVE-2016-1840)

  - Multiple out-of-bounds read errors exist in the libxml2     component in parser.c. An unauthenticated, remote     attacker can exploit these issues to disclose sensitive     information or cause a denial of service condition.
    (CVE-2016-1838, CVE-2016-4447)

  - A heap buffer overflow condition exists in the OpenSSL     component in the EVP_EncodeUpdate() function within file     crypto/evp/encode.c that is triggered when handling a     large amount of input data. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition. (CVE-2016-2105)

  - A heap buffer overflow condition exists in the OpenSSL     component in the EVP_EncryptUpdate() function within     file crypto/evp/evp_enc.c that is triggered when     handling a large amount of input data after a previous     call occurs to the same function with a partial block.
    An unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2016-2106)

  - Flaws exist in the aesni_cbc_hmac_sha1_cipher()     function in file crypto/evp/e_aes_cbc_hmac_sha1.c and     the aesni_cbc_hmac_sha256_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered     when the connection uses an AES-CBC cipher and AES-NI     is supported by the server. A man-in-the-middle attacker     can exploit these to conduct a padding oracle attack,     resulting in the ability to decrypt the network traffic.
    (CVE-2016-2107)

  - A remote code execution vulnerability exists in the     OpenSSL component in the ASN.1 encoder due to an     underflow condition that occurs when attempting to     encode the value zero represented as a negative integer.
    An unauthenticated, remote attacker can exploit this to     corrupt memory, resulting in the execution of arbitrary     code. (CVE-2016-2108)

  - Multiple unspecified flaws exist in the d2i BIO     functions when reading ASN.1 data from a BIO due to     invalid encoding causing a large allocation of memory.
    An unauthenticated, remote attacker can exploit these to     cause a denial of service condition through resource     exhaustion. (CVE-2016-2109)

  - An out-of-bounds read error exists in the     X509_NAME_oneline() function within file     crypto/x509/x509_obj.c when handling very long ASN1     strings. An unauthenticated, remote attacker can exploit     this to disclose the contents of stack memory.
    (CVE-2016-2176)

  - An overflow condition exists in the Perl-Compatible     Regular Expressions (PCRE) component due to improper     validation of user-supplied input when handling the     (*ACCEPT) verb. An unauthenticated, remote attacker can     exploit this to cause a denial of service condition or     the execution of arbitrary code. (CVE-2016-3191)

  - A flaw exists in the libxml2 component in parser.c that     occurs when handling XML content in recovery mode. An     unauthenticated, remote attacker can exploit this to     cause a stack exhaustion, resulting in a denial of     service condition. (CVE-2016-3627)

  - A flaw exists in the libxml2 component in parser.c due     to improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit this to     cause a stack exhaustion, resulting in a denial of     service condition. (CVE-2016-3705)

  - A format string flaw exists in the libxml2 component due     to improper use of string format specifiers (e.g. %s and     %x). An unauthenticated, remote attacker can exploit     this to cause a denial of service condition or the     execution of arbitrary code. (CVE-2016-4448)

  - An XML external entity injection vulnerability exists in     parser.c due to improper parsing of XML data. An     unauthenticated, remote attacker can exploit this, via     specially crafted XML data, to disclose arbitrary files     or cause a denial of service condition. (CVE-2016-4449)

  - An out-of-bounds read error exists in the libxml2     component in xmlsave.c that occurs when handling XML     content in recovery mode. An unauthenticated, remote     attacker can exploit this to disclose sensitive     information or cause a denial of service condition.
    (CVE-2016-4483)

  - A security bypass vulnerability exists in the libcurl     component due to the program attempting to resume TLS     sessions even if the client certificate fails. An     unauthenticated, remote attacker can exploit this to     bypass validation mechanisms. (CVE-2016-5419)

  - An information disclosure vulnerability exists in the     libcurl component due to the program reusing TLS     connections with different client certificates. An     unauthenticated, remote attacker can exploit this to     disclose sensitive cross-realm information.
    (CVE-2016-5420)

  - A use-after-free error exists in the libcurl component     that is triggered as connection pointers are not     properly cleared for easy handles. An unauthenticated,     remote attacker can exploit this to dereference already     freed memory, potentially resulting in the execution of     arbitrary code. (CVE-2016-5421)

  - Multiple stored cross-site scripting (XSS)   	vulnerabilities exist due to improper validation of   	user-supplied input. An authenticated, remote attacker   	can exploit these, via a specially crafted request, to   	execute arbitrary script code in a user's browsers   	session. (CVE-2016-9261)

This update for libxml2 fixes the following security issues :

  - CVE-2016-2073, CVE-2015-8806, CVE-2016-1839: A     Heap-buffer overread was fixed in libxml2/dict.c     [bsc#963963, bsc#965283, bsc#981114].

  - CVE-2016-4483: Code was added to avoid an out of bound     access when serializing malformed strings [bsc#978395].

  - CVE-2016-1762: Fixed a heap-based buffer overread in     xmlNextChar [bsc#981040].

  - CVE-2016-1834: Fixed a heap-buffer-overflow in     xmlStrncat [bsc#981041].

  - CVE-2016-1833: Fixed a heap-based buffer overread in     htmlCurrentChar [bsc#981108].

  - CVE-2016-1835: Fixed a heap use-after-free in     xmlSAX2AttributeNs [bsc#981109].

  - CVE-2016-1837: Fixed a heap use-after-free in     htmlParsePubidLiteral and htmlParseSystemiteral     [bsc#981111].

  - CVE-2016-1838: Fixed a heap-based buffer overread in     xmlParserPrintFileContextInternal [bsc#981112].

  - CVE-2016-1840: Fixed a heap-buffer-overflow in     xmlFAParsePosCharGroup [bsc#981115].

  - CVE-2016-4447: Fixed a heap-based buffer-underreads due     to xmlParseName [bsc#981548].

  - CVE-2016-4448: Fixed some format string warnings with     possible format string vulnerability [bsc#981549],

  - CVE-2016-4449: Fixed inappropriate fetch of entities     content [bsc#981550].

  - CVE-2016-3705: Fixed missing increment of recursion     counter.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Daniel Veillard reports :

More format string warnings with possible format string vulnerability (David Kilzer)

Avoid building recursive entities (Daniel Veillard)

Heap-based buffer overread in htmlCurrentChar (Pranjal Jumde)

Heap-based buffer-underreads due to xmlParseName (David Kilzer)

Heap use-after-free in xmlSAX2AttributeNs (Pranjal Jumde)

Heap use-after-free in htmlParsePubidLiteral and htmlParseSystemiteral (Pranjal Jumde)

Fix some format string warnings with possible format string vulnerability (David Kilzer)

Detect change of encoding when parsing HTML names (Hugh Davenport)

Fix inappropriate fetch of entities content (Daniel Veillard)

Bug 759398: Heap use-after-free in xmlDictComputeFastKey (Pranjal Jumde)

Bug 758605: Heap-based buffer overread in xmlDictAddString (Pranjal Jumde)

Bug 758588: Heap-based buffer overread in xmlParserPrintFileContextInternal (David Kilzer)

Bug 757711: heap-buffer-overflow in xmlFAParsePosCharGroup (Pranjal Jumde)

Add missing increments of recursion depth counter to XML parser.
(Peter Simons)

Fix NULL pointer deref in XPointer range-to

The specific version of Mac OS X that the system is running is reportedly affected by the following vulnerabilities:

- Apple Mac OS X contains a use-after-free error in the WindowServer process that is triggered when handling CFData objects in memory. This may allow a local attacker to dereference already freed memory and gain elevated privileges. (CVE-2016-1804)

- Apple Mac OS X contains an array indexing flaw in the blit3d_submit_commands() function within the IOAcceleratorFamily component. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1815)

- Multiple Apple products contains a flaw as HTTP and HTTPS requests are not properly handled. This may allow an attacker with the ability to intercept network traffic (e.g. MitM, DNS cache poisoning) to disclose transmitted data. (CVE-2016-1801)

- Multiple Apple products contain a flaw that is triggered when handling return values related to key lengths in CommonCrypto (CCCrypt). This may allow a local attacker to gain unauthorized access to sensitive user information. (CVE-2016-1802)

- Multiple Apple products contain a NULL pointer dereference flaw in CoreCapture that is triggered as input is not properly validated. This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1803)

- Multiple Apple products contain a flaw related to disk images that is triggered by a race condition related to locking. This may allow a local attacker to gain unauthorized access to kernel memory information. (CVE-2016-1807)

- Multiple Apple products contain a flaw that is triggered as user-supplied input is not properly validated when handling disk images. This may allow a local attacker to corrupt memory to cause a denial of service or potentially execute arbitrary code. (CVE-2016-1808)

- Multiple Apple products contain a NULL pointer dereference flaw in ImageIO that is triggered when handling a specially crafted image. This may allow a context-dependent attacker to cause a denial of service. (CVE-2016-1811)

- Multiple Apple products contain an overflow condition in the IOAcceleratorFamily component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a buffer overflow and potentially execute arbitrary code with kernel privileges. (CVE-2016-1817)

- Multiple Apple products contains a flaw in the IOAcceleratorFamily component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1818)

- Multiple Apple products contain a use-after-free condition in the IOAcceleratorFamily component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to dereference already freed memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1819)

- Multiple Apple products contain a NULL pointer dereference in IOAcceleratorFamily related to improper locking. This may allow a local attacker to cause a denial of service. (CVE-2016-1814)

- Multiple Apple products contain a NULL pointer dereference in the IOAccelSharedUserClient2::page_off_resource() function that is triggered as user-supplied input is not properly sanitized. This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1813)

- Multiple Apple products contains an out-of-bounds access flaw in the IOHIDFamily component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1823)

- Multiple Apple products contains a flaw in the IOHIDFamily component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory to cause a denial of service or potentially execute arbitrary code with kernel privileges. (CVE-2016-1824)

- Multiple Apple products contain a flaw in the kernel. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code with kernel privileges. (CVE-2016-1827, CVE-2016-1828, CVE-2016-1829, CVE-2016-1830, CVE-2016-1831)

- Multiple Apple products contains a flaw in libc. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code. (CVE-2016-1832)

- Libxml2 contains an overflow condition in the xmlStrncatNew() function of xmlstring.c . The issue is triggered as user-supplied input is not properly validated when handling a string with a NULL. With a specially crafted file, a context-dependent attacker can cause a heap-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code. (CVE-2016-1834)

- Libxml2 contains a use-after-free error in the xmlParseStartTag2() function of parser.c. The issue is triggered when parsing complex names. With a specially crafted file, a context-dependent attacker can dereference already freed memory and potentially execute arbitrary code. (CVE-2016-1835)

- Libxml2 contains a use-after-free error in the xmlParseNCNameComplex() function of parser.c. The issue is triggered when parsing complex names. With a specially crafted file, a context-dependent attacker can dereference already freed memory and potentially execute arbitrary code. (CVE-2016-1836)

- Libxml2 contains an overflow condition in the htmlParseSystemLiteral() and htmlParsePubidLiteral() functions of HTMLparser.c. The issue is triggered as user-supplied input is not properly validated when parsing characters in a range. With a specially crafted file, a context-dependent attacker can cause a heap-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code. (CVE-2016-1837)

- Libxml2 contains an overflow condition in the xmlFAParseCharRange() function of xmlregexp.c. The issue is triggered as user-supplied input is not properly validated when parsing characters in a range. With a specially crafted file, a context-dependent attacker can cause a heap-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code. (CVE-2016-1840)

- Multiple Apple products contains a flaw in libxslt. The issue is triggered as user-supplied input is not properly validated when handling a specially crafted website. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code. (CVE-2016-1841)

- Multiple Apple products contain a flaw in MapKit that is triggered as shared links are transferred insecurely over HTTP. This may potentially allow a man-in-the-middle attacker to gain unauthorized access to sensitive information in these links. (CVE-2016-1842)

- Multiple Apple products contains a flaw in the OpenGL component. The issue is triggered as user-supplied input is not properly validated when handling specially crafted web content. This may allow a context-dependent attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code. (CVE-2016-1847)

- Apple Mac OS X contains a flaw in the AMD component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1792)

- Apple Mac OS X contains a flaw in the AMD component. The issue is triggered as bounds are not properly checked. This may allow a local attacker to determine kernel memory layout. (CVE-2016-1791)

- Apple Mac OS X contains a NULL pointer dereference flaw in the AppleGraphicsControl component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1793)

- Apple Mac OS X contains a NULL pointer dereference flaw in the AppleGraphicsControlClient::checkArguments() function in AppleMuxControl.kext that is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1794)

- Apple Mac OS X contains a flaw in the AppleGraphicsPowerManagement component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1795)

- Apple Mac OS X contains an out-of-bounds read flaw in the ATS component. This may allow a local attacker to potentially disclose kernel memory layout. (CVE-2016-1796)

- Apple Mac OS X contains a flaw in the ATS component that is triggered the sandbox policy is not properly implemented for FontValidator. This may allow a local attacker to potentially execute arbitrary code with system privileges. (CVE-2016-1797)

- Apple Mac OS X contains a NULL pointer dereference flaw in the Audio component that is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a denial of service. (CVE-2016-1798)

- Apple Mac OS X contains a flaw in the Audio component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and potentially execute arbitrary code with kernel privileges. (CVE-2016-1799)

- Apple Mac OS X contains a flaw in the Captive Network Assistant component that is triggered as URL schemes are not properly validated. This may allow a user-assisted, man-in-the-middle attacker to potentially execute arbitrary code. (CVE-2016-1800)

- Apple Mac OS X contains an unspecified configuration flaw in the CoreStorage component. This may allow a local attacker to potentially execute arbitrary code with kernel privileges. (CVE-2016-1805)

- Apple Mac OS X contains a flaw in the Crash Reporter component (com.apple.SubmitDiagInfo) that is triggered when handling user-supplied paths when creating directories. This may allow a local attacker to execute arbitrary code with root privileges. (CVE-2016-1806)

- Apple Mac OS X contains a flaw in the Disk Utility component that is triggered as the incorrect keys were used to encrypt disk images. This may result in disk images not being properly compressed and encrypted. (CVE-2016-1809)

- Apple Mac OS X contains a NULL pointer dereference flaw in the ImageIO component that is triggered when handling a specially crafted image. This may allow a context-dependent attacker to cause a denial of service. (CVE-2016-1810)

- Apple Mac OS X contains an overflow condition in the Intel Graphics Driver component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code with kernel privileges. (CVE-2016-1812)

- Apple Mac OS X contains a NULL pointer dereference in IOAcceleratorFamily that is triggered as user-supplied input is not properly sanitized. This may allow a local attacker to execute arbitrary code with kernel privileges. (CVE-2016-1816)

- Apple Mac OS X contains an overflow condition in the IOAudioFamily component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to cause a buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code with kernel privileges. (CVE-2016-1820)

- Apple Mac OS X contains a NULL pointer dereference in the IOAudioFamily component. This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1821)

- Apple Mac OS X contains a flaw in the IOFireWireFamily component. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code with kernel privileges. (CVE-2016-1822)

- Apple Mac OS X contains multiple flaws in the IOHIDFamily component. These issues are triggered as user-supplied input is not properly validated. This may allow a local attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code with kernel privileges. (CVE-2016-1825)

- Apple Mac OS X contains an integer overflow condition in its dtrace implementation. The issue is triggered as user-supplied input is not properly validated. This may allow a local attacker to execute arbitrary code with kernel privileges. (CVE-2016-1826)

- Apple Mac OS X contains a flaw in the Messages component that is triggered by a failure to properly validate roster changes. This may allow an authenticated remote attacker, or a malicious server, to manipulate another user's contact list. (CVE-2016-1844)

- Apple Mac OS X contains a flaw in the Messages component that is triggered by an encoding issue in filename parsing. This may allow a remote attacker to gain unauthorized access to potentially sensitive user information. (CVE-2016-1843)

- Apple Mac OS X contains a NULL pointer dereference flaw in the nvCommandQueue::GetHandleIndex() function in the NVIDIA Graphics Driver (GeForce.kext). This may allow a local attacker to cause a crash or potentially execute arbitrary code with kernel privileges. (CVE-2016-1846)

- Apple Mac OS X contains a flaw in the QuickTime component. The issue is triggered as user-supplied input is not properly validated when handling a specially crafted file. This may allow a context-dependent attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code. (CVE-2016-1848)

- Apple Mac OS X contains a flaw in the SceneKit component. The issue is triggered as user-supplied input is not properly validated when handling a specially crafted file. This may allow a context-dependent attacker to corrupt memory and cause a denial of service or potentially execute arbitrary code. (CVE-2016-1850)

- Apple Mac OS X contains a flaw in the management of password profiles. This may allow a physically present attacker to bypass the screen lock and reset an expired password. (CVE-2016-1851)

- Apple Mac OS X contains a flaw in the Tcl component related to the usage of SSLv2. This may potentially allow an attacker with the ability to intercept network traffic (e.g. MitM, DNS cache poisoning) to disclose transmitted data. (CVE-2016-1853)

- Apple Mac OS X contains an overflow condition in the NVIDIA Graphics Driver (GeForce.kext). This may allow a local attacker to cause a stack-based buffer overflow and potentially execute arbitrary code with kernel privileges. (CVE-2016-1861)

- No description supplied (CVE-2016-1833, CVE-2016-1839, CVE-2016-1815, CVE-2016-1804)

A heap-based buffer overflow flaw was found in the way libxml2 parsed certain crafted XML input. A remote attacker could provide a specially crafted XML file that, when opened in an application linked against libxml2, would cause the application to crash or execute arbitrary code with the permissions of the user running the application.
(CVE-2016-1834 , CVE-2016-1840)

Multiple denial of service flaws were found in libxml2. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, could cause that application to crash. (CVE-2016-1762 , CVE-2016-1833 , CVE-2016-1835 , CVE-2016-1836 , CVE-2016-1837 , CVE-2016-1838 , CVE-2016-1839 , CVE-2016-3627 , CVE-2016-3705 , CVE-2016-4447 , CVE-2016-4448 , CVE-2016-4449)

The remote host is running a version of Mac OS X version 10.11.x prior to 10.11.5 and is affected by multiple vulnerabilities in the following components :

 - AMD
 - apache_mod_php
 - AppleGraphicsControl
 - AppleGraphicsPowerManagement
 - ATS
 - Audio
 - Captive Network Assistant
 - CFNetwork Proxies
 - CommonCrypto
 - CoreCapture
 - CoreStorage
 - Crash Reporter
 - Disk Images
 - Disk Utility
 - Graphics Drivers
 - ImageIO
 - Intel Graphics Driver
 - IOAcceleratorFamily
 - IOAudioFamily
 - IOFireWireFamily
 - IOHIDFamilyKernel
 - libc
 - libxml2
 - libxslt
 - MapKit
 - Messages
 - Multi-Touch
 - NVIDIA Graphics Drivers
 - OpenGL
 - QuickTime
 - SceneKit
 - Screen Lock
 - Tcl

Security Fix(es) :

A heap-based buffer overflow flaw was found in the way libxml2 parsed certain crafted XML input. A remote attacker could provide a specially crafted XML file that, when opened in an application linked against libxml2, would cause the application to crash or execute arbitrary code with the permissions of the user running the application.
(CVE-2016-1834, CVE-2016-1840)

Multiple denial of service flaws were found in libxml2. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, could cause that application to crash. (CVE-2016-1762, CVE-2016-1833, CVE-2016-1835, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, CVE-2016-3627, CVE-2016-3705, CVE-2016-4447, CVE-2016-4448, CVE-2016-4449)

An update for libxml2 is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

[Updated 18 July 2016] This advisory has been updated to push packages into the Red Hat Enterprise Linux 6 Desktop channels. The packages included in this revised update have not been changed in any way from the packages included in the original advisory.

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es) :

A heap-based buffer overflow flaw was found in the way libxml2 parsed certain crafted XML input. A remote attacker could provide a specially crafted XML file that, when opened in an application linked against libxml2, would cause the application to crash or execute arbitrary code with the permissions of the user running the application.
(CVE-2016-1834, CVE-2016-1840)

Multiple denial of service flaws were found in libxml2. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, could cause that application to crash. (CVE-2016-1762, CVE-2016-1833, CVE-2016-1835, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, CVE-2016-3627, CVE-2016-3705, CVE-2016-4447, CVE-2016-4448, CVE-2016-4449)

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Update doc/redhat.gif in tarball

  - Add libxml2-oracle-enterprise.patch and update logos in     tarball

  - Heap-based buffer overread in xmlNextChar     (CVE-2016-1762)

  - Bug 763071: Heap-buffer-overflow in xmlStrncat     (CVE-2016-1834)

  - Bug 757711: Heap-buffer-overflow in     xmlFAParsePosCharGroup (CVE-2016-1840)

  - Bug 758588: Heap-based buffer overread in     xmlParserPrintFileContextInternal (CVE-2016-1838)

  - Bug 758605: Heap-based buffer overread in     xmlDictAddString (CVE-2016-1839)

  - Bug 759398: Heap use-after-free in xmlDictComputeFastKey     (CVE-2016-1836)

  - Fix inappropriate fetch of entities content     (CVE-2016-4449)

  - Heap use-after-free in htmlParsePubidLiteral and     htmlParseSystemiteral (CVE-2016-1837)

  - Heap use-after-free in xmlSAX2AttributeNs     (CVE-2016-1835)

  - Heap-based buffer-underreads due to xmlParseName     (CVE-2016-4447)

  - Heap-based buffer overread in htmlCurrentChar     (CVE-2016-1833)

  - Add missing increments of recursion depth counter to XML     parser. (CVE-2016-3705)

  - Avoid building recursive entities (CVE-2016-3627)

  - Fix some format string warnings with possible format     string vulnerability (CVE-2016-4448)

  - More format string warnings with possible format string     vulnerability (CVE-2016-4448)

  - Fix large parse of file from memory (rhbz#862969)

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-1292 advisory.

    - Heap-based buffer overread in xmlNextChar (CVE-2016-1762)
    - Bug 763071: Heap-buffer-overflow in xmlStrncat <https://bugzilla.gnome.org/show_bug.cgi?id=763071>     (CVE-2016-1834)
    - Bug 757711: Heap-buffer-overflow in xmlFAParsePosCharGroup     <https://bugzilla.gnome.org/show_bug.cgi?id=757711> (CVE-2016-1840)
    - Bug 758588: Heap-based buffer overread in xmlParserPrintFileContextInternal     <https://bugzilla.gnome.org/show_bug.cgi?id=758588> (CVE-2016-1838)
    - Bug 758605: Heap-based buffer overread in xmlDictAddString     <https://bugzilla.gnome.org/show_bug.cgi?id=758605> (CVE-2016-1839)
    - Bug 759398: Heap use-after-free in xmlDictComputeFastKey     <https://bugzilla.gnome.org/show_bug.cgi?id=759398> (CVE-2016-1836)
    - Fix inappropriate fetch of entities content (CVE-2016-4449)
    - Heap use-after-free in htmlParsePubidLiteral and htmlParseSystemiteral (CVE-2016-1837)
    - Heap use-after-free in xmlSAX2AttributeNs (CVE-2016-1835)
    - Heap-based buffer-underreads due to xmlParseName (CVE-2016-4447)
    - Heap-based buffer overread in htmlCurrentChar (CVE-2016-1833)
    - Add missing increments of recursion depth counter to XML parser. (CVE-2016-3705)
    - Avoid building recursive entities (CVE-2016-3627)
    - Fix some format string warnings with possible format string vulnerability (CVE-2016-4448)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update brings libxml2 to version 2.9.4.

These security issues were fixed :

  - CVE-2016-3627: The xmlStringGetNodeList function in     tree.c, when used in recovery mode, allowed     context-dependent attackers to cause a denial of service     (infinite recursion, stack consumption, and application     crash) via a crafted XML document (bsc#972335).

  - CVE-2016-1833: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1834,     CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840 (bsc#981108).

  - CVE-2016-1835: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document     (bsc#981109).

  - CVE-2016-1837: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1834, CVE-2016-1836, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840 (bsc#981111).

  - CVE-2016-1836: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1834, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840 (bsc#981110).

  - CVE-2016-1839: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1840 (bsc#981114).

  - CVE-2016-1838: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1839, and CVE-2016-1840 (bsc#981112).

  - CVE-2016-1840: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1839 (bsc#981115).

  - CVE-2016-4483: out-of-bounds read parsing an XML using     recover mode (bnc#978395).

  - CVE-2016-1834: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document, a     different vulnerability than CVE-2016-1833,     CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840 (bsc#981041).

  - CVE-2016-3705: The (1) xmlParserEntityCheck and (2)     xmlParseAttValueComplex functions in parser.c in libxml2     did not properly keep track of the recursion depth,     which allowed context-dependent attackers to cause a     denial of service (stack consumption and application     crash) via a crafted XML document containing a large     number of nested entity references (bsc#975947).

  - CVE-2016-1762: libxml2 allowed remote attackers to     execute arbitrary code or cause a denial of service     (memory corruption) via a crafted XML document     (bsc#981040).

This non-security issue was fixed :

  - bnc#983288: Fix attribute decoding during XML schema     validation

This update for libxml2 fixes the following security issues :

  - CVE-2016-2073, CVE-2015-8806, CVE-2016-1839: A     Heap-buffer overread was fixed in libxml2/dict.c     [bsc#963963, bsc#965283, bsc#981114].

  - CVE-2016-4483: Code was added to avoid an out of bound     access when serializing malformed strings [bsc#978395].

  - CVE-2016-1762: Fixed a heap-based buffer overread in     xmlNextChar [bsc#981040].

  - CVE-2016-1834: Fixed a heap-buffer-overflow in     xmlStrncat [bsc#981041].

  - CVE-2016-1833: Fixed a heap-based buffer overread in     htmlCurrentChar [bsc#981108].

  - CVE-2016-1835: Fixed a heap use-after-free in     xmlSAX2AttributeNs [bsc#981109].

  - CVE-2016-1837: Fixed a heap use-after-free in     htmlParsePubidLiteral and htmlParseSystemiteral     [bsc#981111].

  - CVE-2016-1838: Fixed a heap-based buffer overread in     xmlParserPrintFileContextInternal [bsc#981112].

  - CVE-2016-1840: Fixed a heap-buffer-overflow in     xmlFAParsePosCharGroup [bsc#981115].

  - CVE-2016-4447: Fixed a heap-based buffer-underreads due     to xmlParseName [bsc#981548].

  - CVE-2016-4448: Fixed some format string warnings with     possible format string vulnerability [bsc#981549],

  - CVE-2016-4449: Fixed inappropriate fetch of entities     content [bsc#981550].

  - CVE-2016-3705: Fixed missing increment of recursion     counter.

This update was imported from the SUSE:SLE-12:Update update project.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2994-1 advisory.

    It was discovered that libxml2 incorrectly handled certain malformed documents. If a user or automated     system were tricked into opening a specially crafted document, an attacker could possibly cause libxml2 to     crash, resulting in a denial of service. (CVE-2015-8806, CVE-2016-2073, CVE-2016-3627, CVE-2016-3705,     CVE-2016-4447)

    It was discovered that libxml2 incorrectly handled certain malformed documents. If a user or automated     system were tricked into opening a specially crafted document, an attacker could cause libxml2 to crash,     resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-1762, CVE-2016-1834)

    Mateusz Jurczyk discovered that libxml2 incorrectly handled certain malformed documents. If a user or     automated system were tricked into opening a specially crafted document, an attacker could cause libxml2     to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-1833,     CVE-2016-1838, CVE-2016-1839)

    Wei Lei and Liu Yang discovered that libxml2 incorrectly handled certain malformed documents. If a user or     automated system were tricked into opening a specially crafted document, an attacker could cause libxml2     to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-1835,     CVE-2016-1837)

    Wei Lei and Liu Yang discovered that libxml2 incorrectly handled certain malformed documents. If a user or     automated system were tricked into opening a specially crafted document, an attacker could cause libxml2     to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only applied to     Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. (CVE-2016-1836)

    Kostya Serebryany discovered that libxml2 incorrectly handled certain malformed documents. If a user or     automated system were tricked into opening a specially crafted document, an attacker could cause libxml2     to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-1840)

    It was discovered that libxml2 would load certain XML external entities. If a user or automated system     were tricked into opening a specially crafted document, an attacker could possibly obtain access to     arbitrary files or cause resource consumption. (CVE-2016-4449)

    Gustavo Grieco discovered that libxml2 incorrectly handled certain malformed documents. If a user or     automated system were tricked into opening a specially crafted document, an attacker could possibly cause     libxml2 to crash, resulting in a denial of service. (CVE-2016-4483)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause a denial of service against the application, or potentially the execution of arbitrary code with the privileges of the user running the application.

For Debian 7 'Wheezy', these problems have been fixed in version 2.8.0+dfsg1-7+wheezy6.

We recommend that you upgrade your libxml2 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause a denial-of-service against the application, or potentially the execution of arbitrary code with the privileges of the user running the application.

Versions of Apple TV earlier than 9.2.1 are unpatched for vulnerabilities in the following components :

 - CFNetwork Proxies
 - CommonCrypto
 - CoreCapture
 - Disk Images
 - ImageIO
 - IOAcceleratorFamily
 - IOHIDFamily
 - Kernel
 - libc
 - libxml2
 - libxslt
 - OpenGL
 - WebKit
 - WebKit Canvas
 

The remote host is running a version of iOS that is prior to version 9.3.2 and the following components contain vulnerabilities :

 - Accessibility
 - CFNetwork Proxies
 - CommonCrypto
 - CoreCapture
 - Disk Images
 - ImageIO
 - IOAcceleratorFamily
 - IOHIDFamily
 - Kernel
 - libc
 - libxml2
 - libxslt
 - MapKit
 - OpenGL
 - Safari
 - Siri
 - WebKit
 - WebKit Canvas

According to its banner, the version of the remote Apple TV device is prior to 9.2.1. It is, therefore, affected by multiple vulnerabilities in the following components :

  - CFNetwork Proxies
  - CommonCrypto
  - CoreCapture
  - Disk Images
  - ImageIO
  - IOAcceleratorFamily
  - IOHIDFamily
  - Kernel
  - libc
  - libxml2
  - libxslt
  - OpenGL
  - WebKit
  - WebKit Canvas

Note that only 4th generation models are affected by the vulnerabilities.

The remote host is running a version of Mac OS X that is 10.9.5 or 10.10.5 and is missing Security Update 2016-003. It is, therefore, affected by multiple vulnerabilities in the following components :

  - AMD
  - Captive Network Assistant
  - libxml2
  - libxslt
  - OpenGL

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

The remote host is running a version of Mac OS X that is 10.11.x prior to 10.11.5. It is, therefore, affected by multiple vulnerabilities in the following components :

  - AMD
  - apache_mod_php
  - AppleGraphicsControl
  - AppleGraphicsPowerManagement
  - Assistant
  - ATS
  - Audio
  - Captive
  - CFNetwork
  - CommonCrypto
  - CoreCapture
  - CoreStorage
  - Crash
  - Disk
  - Disk
  - Driver
  - Drivers
  - Drivers
  - Graphics
  - Graphics
  - Graphics
  - ImageIO
  - Images
  - Intel
  - IOAcceleratorFamily
  - IOAudioFamily
  - IOFireWireFamily
  - IOHIDFamily
  - Kernel
  - libc
  - libxml2
  - libxslt
  - Lock
  - MapKit
  - Messages
  - Multi-Touch
  - Network
  - NVIDIA
  - OpenGL
  - Proxies
  - QuickTime
  - Reporter
  - SceneKit
  - Screen
  - Tcl
  - Utility

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

The mobile device is running a version of iOS prior to 9.3.2. It is, therefore, affected by multiple vulnerabilities in the following components :

  - Accessibility
  - CFNetwork Proxies
  - CommonCrypto
  - CoreCapture
  - Disk Images
  - ImageIO
  - IOAcceleratorFamily
  - IOHIDFamily
  - Kernel
  - libc
  - libxml2
  - libxslt
  - MapKit
  - OpenGL
  - Safari
  - Siri
  - WebKit
  - WebKit Canvas

ID	Name	Product	Family	Severity
198481	RHEL 5 : libxml2 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	critical
99492	Fedora 24 : libxml2 (2017-be8574d593)	Nessus	Fedora Local Security Checks	critical
99491	Fedora 25 : libxml2 (2017-a3a47973eb)	Nessus	Fedora Local Security Checks	critical
97893	Tenable Log Correlation Engine (LCE) < 4.8.1 Multiple Vulnerabilities	Nessus	Misc.	critical
93154	SUSE SLES11 Security Update : libxml2 (SUSE-SU-2016:1604-1)	Nessus	SuSE Local Security Checks	critical
93145	FreeBSD : libxml2 -- multiple vulnerabilities (e195679d-045b-4953-bb33-be0073ba2ac6)	Nessus	FreeBSD Local Security Checks	high
802004	macOS < 10.11.5 Multiple Vulnerabilities	Log Correlation Engine	Operating System Detection	high
92221	Amazon Linux AMI : libxml2 (ALAS-2016-719)	Nessus	Amazon Linux Local Security Checks	critical
9392	Mac OS X 10.11.x < 10.11.5 Multiple Vulnerabilities	Nessus Network Monitor	Operating System Detection	high
91808	Scientific Linux Security Update : libxml2 on SL6.x, SL7.x i386/x86_64 (20160623)	Nessus	Scientific Linux Local Security Checks	critical
91802	RHEL 6 / 7 : libxml2 (RHSA-2016:1292)	Nessus	Red Hat Local Security Checks	critical
91800	OracleVM 3.3 / 3.4 : libxml2 (OVMSA-2016-0087)	Nessus	OracleVM Local Security Checks	critical
91797	Oracle Linux 6 / 7 : libxml2 (ELSA-2016-1292)	Nessus	Oracle Linux Local Security Checks	critical
91786	CentOS 6 / 7 : libxml2 (CESA-2016:1292)	Nessus	CentOS Local Security Checks	critical
91656	SUSE SLED12 / SLES12 Security Update : libxml2 (SUSE-SU-2016:1538-1)	Nessus	SuSE Local Security Checks	critical
91640	openSUSE Security Update : libxml2 (openSUSE-2016-734)	Nessus	SuSE Local Security Checks	high
91639	openSUSE Security Update : libxml2 (openSUSE-2016-733)	Nessus	SuSE Local Security Checks	critical
91499	Ubuntu 14.04 LTS / 16.04 LTS : libxml2 vulnerabilities (USN-2994-1)	Nessus	Ubuntu Local Security Checks	high
91472	Debian DLA-503-1 : libxml2 security update	Nessus	Debian Local Security Checks	high
91447	Debian DSA-3593-1 : libxml2 - security update	Nessus	Debian Local Security Checks	high
9337	Apple TV < 9.2.1 Multiple Vulnerabilities	Nessus Network Monitor	Internet Services	high
9332	Apple iOS < 9.3.2 Multiple Vulnerabilities	Nessus Network Monitor	Mobile Devices	high
91311	Apple TV < 9.2.1 Multiple Vulnerabilities	Nessus	Misc.	high
91229	Mac OS X 10.9.5 / 10.10.5 Multiple Vulnerabilities (Security Update 2016-003)	Nessus	MacOS X Local Security Checks	high
91228	Mac OS X 10.11.x < 10.11.5 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	high
91225	Apple iOS < 9.3.2 Multiple Vulnerabilities	Nessus	Mobile Devices	high

Detections

Analytics

CVE-2016-1837

medium

Tenable Plugins

critical

critical

critical

critical

critical

critical

high

high

critical

high

critical

critical

critical

critical

critical

critical

high

critical

high

high

high

high

high

high

high

high

high