A maliciously constructed HTTP/2 request could cause mod_http2 in Apache HTTP Server 2.4.24, 2.4.25 to dereference a NULL pointer and crash the server process.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:2483 advisory.

    The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

    Security Fix(es):

    * It was discovered that the httpd's mod_auth_digest module did not properly initialize memory before     using it when processing certain headers related to digest authentication. A remote attacker could     possibly use this flaw to disclose potentially sensitive information or cause httpd child process to crash     by sending specially crafted requests to a server. (CVE-2017-9788)

    * It was discovered that the use of httpd's ap_get_basic_auth_pw() API function outside of the     authentication phase could lead to authentication bypass. A remote attacker could possibly use this flaw     to bypass required authentication if the API was used incorrectly by one of the modules used by httpd.
    (CVE-2017-3167)

    * A NULL pointer dereference flaw was found in the httpd's mod_ssl module. A remote attacker could use     this flaw to cause an httpd child process to crash if another module used by httpd called a certain API     function during the processing of an HTTPS request. (CVE-2017-3169)

    * A NULL pointer dereference flaw was found in the mod_http2 module of httpd. A remote attacker could use     this flaw to cause httpd child process to crash via a specially crafted HTTP/2 request. (CVE-2017-7659)

    * A buffer over-read flaw was found in the httpd's ap_find_token() function. A remote attacker could use     this flaw to cause httpd child process to crash via a specially crafted HTTP request. (CVE-2017-7668)

    * A buffer over-read flaw was found in the httpd's mod_mime module. A user permitted to modify httpd's     MIME configuration could use this flaw to cause httpd child process to crash. (CVE-2017-7679)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

The remote host is running a version of macOS that is prior to 10.13. It is, therefore, affected by multiple vulnerabilities in the following components :

 - Apache
 - AppSandbox
 - AppleScript
 - Application Firewall
 - ATS
 - Audio
 - CFNetwork
 - CFNetwork Proxies
 - CFString
 - Captive Network Assistant
 - CoreAudio
 - CoreText
 - DesktopServices
 - Directory Utility
 - file
 - Fonts
 - fsck_msdos
 - HFS
 - Heimdal
 - HelpViewer
 - IOFireWireFamily
 - ImageIO
 - Installer
 - Kernel
 - kext tools
 - libarchive
 - libc
 - libexpat
 - Mail
 - Mail Drafts
 - ntp
 - Open Scripting Architecture
 - PCRE
 - Postfix
 - Quick Look
 - QuickTime
 - Remote Management
 - SQLite
 - Sandbox
 - Screen Lock
 - Security
 - Spotlight
 - WebKit
 - zlib

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

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.26. It is, therefore, affected by the following vulnerabilities :

 - An authentication bypass vulnerability exists due to third-party modules using the ap_get_basic_auth_pw() function outside of the authentication phase. An unauthenticated, remote attacker can exploit this to bypass authentication requirements. (CVE-2017-3167)

 - A NULL pointer dereference flaw exists due to third-party module calls to the mod_ssl ap_hook_process_connection() function during an HTTP request to an HTTPS port. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. (CVE-2017-3169)

 - A NULL pointer dereference flaw exists in mod_http2 that is triggered when handling a specially crafted HTTP/2 request. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. Note that this vulnerability does not affect 2.2.x. (CVE-2017-7659)

 - An out-of-bounds read error exists in the ap_find_token() function due to improper handling of header sequences. An unauthenticated, remote attacker can exploit this, via a specially crafted header sequence, to cause a denial of service condition. (CVE-2017-7668)

 - An out-of-bounds read error exists in mod_mime due to improper handling of Content-Type response headers. An unauthenticated, remote attacker can exploit this, via a specially crafted Content-Type response header, to cause a denial of service condition or the disclosure of sensitive information. (CVE-2017-7679)

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

This update for apache2 fixes several issues.

These security issues were fixed :

  - CVE-2017-9789: When under stress (closing many     connections) the HTTP/2 handling code would sometimes     access memory after it has been freed, resulting in     potentially erratic behaviour (bsc#1048575).

  - CVE-2017-7659: A maliciously constructed HTTP/2 request     could cause mod_http2 to dereference a NULL pointer and     crash the server process (bsc#1045160).

These non-security issues were fixed :

  - Use the full path to a2enmod and a2dismod in the     apache-22-24-upgrade script (bsc#1042037)

  - Fall back to 'localhost' as hostname in gensslcert     (bsc#1057406)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This update for apache2 fixes several issues. These security issues were fixed :

  - CVE-2017-9789: When under stress (closing many     connections) the HTTP/2 handling code would sometimes     access memory after it has been freed, resulting in     potentially erratic behaviour (bsc#1048575).

  - CVE-2017-7659: A maliciously constructed HTTP/2 request     could cause mod_http2 to dereference a NULL pointer and     crash the server process (bsc#1045160).

The update package also includes non-security fixes. See advisory for details.

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.

The remote host is running Mac OS X 10.11.6 or Mac OS X 10.12.6 and is missing a security update. It is therefore, affected by multiple vulnerabilities affecting the following components :

  - 802.1X
  - apache
  - AppleScript
  - ATS
  - Audio
  - CFString
  - CoreText
  - curl
  - Dictionary Widget
  - file
  - Fonts
  - fsck_msdos
  - HFS
  - Heimdal
  - HelpViewer
  - ImageIO
  - Kernel
  - libarchive
  - Open Scripting Architecture
  - PCRE
  - Postfix
  - Quick Look
  - QuickTime
  - Remote Management
  - Sandbox
  - StreamingZip
  - tcpdump
  - Wi-Fi

The remote host is affected by the vulnerability described in GLSA-201710-32 (Apache: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Apache. Please review       the referenced CVE identifiers for details.
  Impact :

    The Optionsbleed vulnerability can leak arbitrary memory from the server       process that may contain secrets.  Additionally attackers may cause a       Denial of Service condition, bypass authentication, or cause information       loss.
  Workaround :

    There is no known workaround at this time.

The remote host is running a version of FireEye Operating System (FEOS) that is affected by multiple vulnerabilities. See vendor release notes for details.

The remote host is running a version of Mac OS X that is prior to 10.10.5, 10.11.x prior to 10.11.6, 10.12.x prior to 10.12.6, or is not macOS 10.13. It is, therefore, affected by multiple vulnerabilities in the following components :

  - apache
  - AppSandbox
  - AppleScript
  - Application Firewall
  - ATS
  - Audio
  - CFNetwork
  - CFNetwork Proxies
  - CFString
  - Captive Network Assistant
  - CoreAudio
  - CoreText
  - DesktopServices
  - Directory Utility
  - file
  - Fonts
  - fsck_msdos
  - HFS
  - Heimdal
  - HelpViewer
  - IOFireWireFamily
  - ImageIO
  - Installer
  - Kernel
  - kext tools
  - libarchive
  - libc
  - libexpat
  - Mail
  - Mail Drafts
  - ntp
  - Open Scripting Architecture
  - PCRE
  - Postfix
  - Quick Look
  - QuickTime
  - Remote Management
  - SQLite
  - Sandbox
  - Screen Lock
  - Security
  - Spotlight
  - WebKit
  - zlib

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

ap_find_token() buffer overread :

A buffer over-read flaw was found in the httpd's ap_find_token() function. A remote attacker could use this flaw to cause httpd child process to crash via a specially crafted HTTP request. (CVE-2017-7668 )

Apache HTTP Request Parsing Whitespace Defects :

It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in conjunction with a proxy or backend server that interpreted those characters differently, a remote attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache poisoning. (CVE-2016-8743)

ap_get_basic_auth_pw() authentication bypass :

It was discovered that the use of httpd's ap_get_basic_auth_pw() API function outside of the authentication phase could lead to authentication bypass. A remote attacker could possibly use this flaw to bypass required authentication if the API was used incorrectly by one of the modules used by httpd. (CVE-2017-3167)

mod_mime buffer overread :

A buffer over-read flaw was found in the httpd's mod_mime module. A user permitted to modify httpd's MIME configuration could use this flaw to cause httpd child process to crash. (CVE-2017-7679)

mod_http2 NULL pointer dereference :

A NULL pointer dereference flaw was found in the mod_http2 module of httpd. A remote attacker could use this flaw to cause httpd child process to crash via a specially crafted HTTP/2 request.
(CVE-2017-7659)

mod_ssl NULL pointer dereference :

A NULL pointer dereference flaw was found in the httpd's mod_ssl module. A remote attacker could use this flaw to cause a httpd child process to crash if another module used by httpd called a certain API function during the processing of an HTTPS request. (CVE-2017-3169)

File /etc/sysconfig/httpd is ghosted now

----

Version update

----

Security fix for CVE-2017-3167 CVE-2017-3169 CVE-2017-7659 CVE-2017-7668 CVE-2017-7679

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.

Security fix for CVE-2017-3167 CVE-2017-3169 CVE-2017-7659 CVE-2017-7668 CVE-2017-7679

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.

New httpd packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

Several vulnerabilities have been found in the Apache HTTPD server.

  - CVE-2017-3167     Emmanuel Dreyfus reported that the use of     ap_get_basic_auth_pw() by third-party modules outside of     the authentication phase may lead to authentication     requirements being bypassed.

  - CVE-2017-3169     Vasileios Panopoulos of AdNovum Informatik AG discovered     that mod_ssl may dereference a NULL pointer when     third-party modules call ap_hook_process_connection()     during an HTTP request to an HTTPS port leading to a     denial of service.

  - CVE-2017-7659     Robert Swiecki reported that a specially crafted HTTP/2     request could cause mod_http2 to dereference a NULL     pointer and crash the server process.

  - CVE-2017-7668     Javier Jimenez reported that the HTTP strict parsing     contains a flaw leading to a buffer overread in     ap_find_token(). A remote attacker can take advantage of     this flaw by carefully crafting a sequence of request     headers to cause a segmentation fault, or to force     ap_find_token() to return an incorrect value.

  - CVE-2017-7679     ChenQin and Hanno Boeck reported that mod_mime can read     one byte past the end of a buffer when sending a     malicious Content-Type response header.

According to its banner, the version of Apache running on the remote host is 2.2.x prior to 2.2.33-dev or 2.4.x prior to 2.4.26. It is, therefore, affected by the following vulnerabilities :

  - An authentication bypass vulnerability exists due to     third-party modules using the ap_get_basic_auth_pw()     function outside of the authentication phase. An     unauthenticated, remote attacker can exploit this to     bypass authentication requirements. (CVE-2017-3167)

  - A NULL pointer dereference flaw exists due to     third-party module calls to the mod_ssl     ap_hook_process_connection() function during an HTTP     request to an HTTPS port. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition. (CVE-2017-3169)

  - A NULL pointer dereference flaw exists in mod_http2 that     is triggered when handling a specially crafted HTTP/2     request. An unauthenticated, remote attacker can exploit     this to cause a denial of service condition. Note that     this vulnerability does not affect 2.2.x.
    (CVE-2017-7659)

  - An out-of-bounds read error exists in the     ap_find_token() function due to improper handling of     header sequences. An unauthenticated, remote attacker     can exploit this, via a specially crafted header     sequence, to cause a denial of service condition.
    (CVE-2017-7668)

  - An out-of-bounds read error exists in mod_mime due to     improper handling of Content-Type response headers. An     unauthenticated, remote attacker can exploit this, via a     specially crafted Content-Type response header, to cause     a denial of service condition or the disclosure of     sensitive information. (CVE-2017-7679)

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

The Apache httpd project reports :

- ap_get_basic_auth_pw() Authentication Bypass (CVE-2017-3167) : Use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed.

- mod_ssl NULL pointer Dereference (CVE-2017-3169):mod_ssl may dereference a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port.

- mod_http2 NULL pointer Dereference (CVE-2017-7659): A maliciously constructed HTTP/2 request could cause mod_http2 to dereference a NULL pointer and crash the server process.

- ap_find_token() Buffer Overread (CVE-2017-7668):The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.

- mod_mime Buffer Overread (CVE-2017-7679):mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header.

ID	Name	Product	Family	Severity
210279	RHEL 6 / 7 : httpd24-httpd (RHSA-2017:2483)	Nessus	Red Hat Local Security Checks	critical
700511	macOS < 10.13 Multiple Vulnerabilities	Nessus Network Monitor	Operating System Detection	critical
98911	Apache 2.4.x < 2.4.26 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
106523	openSUSE Security Update : apache2 (openSUSE-2018-104)	Nessus	SuSE Local Security Checks	high
106471	SUSE SLES12 Security Update : Recommended update for apache2 (SUSE-SU-2018:0261-1)	Nessus	SuSE Local Security Checks	high
104379	macOS and Mac OS X Multiple Vulnerabilities (Security Update 2017-001 and 2017-004)	Nessus	MacOS X Local Security Checks	critical
104233	GLSA-201710-32 : Apache: Multiple vulnerabilities (Optionsbleed)	Nessus	Gentoo Local Security Checks	critical
103673	FireEye Operating System Multiple Vulnerabilities (AX < 7.7.7 / EX < 8.0.1)	Nessus	Firewalls	critical
103598	macOS < 10.13 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	critical
102178	Amazon Linux AMI : httpd24 (ALAS-2017-863)	Nessus	Amazon Linux Local Security Checks	critical
101778	Fedora 25 : httpd (2017-9ded7c5670)	Nessus	Fedora Local Security Checks	critical
101670	Fedora 26 : httpd (2017-81976b6a91)	Nessus	Fedora Local Security Checks	critical
101511	Fedora 24 : httpd (2017-cf9599a306)	Nessus	Fedora Local Security Checks	critical
101117	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : httpd (SSA:2017-180-03)	Nessus	Slackware Local Security Checks	critical
101013	Debian DSA-3896-1 : apache2 - security update	Nessus	Debian Local Security Checks	critical
100995	Apache 2.2.x < 2.2.33-dev / 2.4.x < 2.4.26 Multiple Vulnerabilities	Nessus	Web Servers	critical
100881	FreeBSD : Apache httpd -- several vulnerabilities (0c2db2aa-5584-11e7-9a7d-b499baebfeaf)	Nessus	FreeBSD Local Security Checks	critical

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CVE-2017-7659

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