Use-after-free vulnerability in validators/DTD/DTDScanner.cpp in Apache Xerces C++ 3.1.3 and earlier allows context-dependent attackers to have unspecified impact via an invalid character in an XML document.

The remote Redhat Enterprise Linux 6 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.

  - xerces-c: Use-after-free in heap on specially crafted XML input (CVE-2016-2099)

  - internal/XMLReader.cpp in Apache Xerces-C before 3.1.2 allows remote attackers to cause a denial of     service (segmentation fault and crash) via crafted XML data. (CVE-2015-0252)

  - Stack-based buffer overflow in Apache Xerces-C++ before 3.1.4 allows context-dependent attackers to cause     a denial of service via a deeply nested DTD. (CVE-2016-4463)

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

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - xerces-c: Use-after-free in heap on specially crafted XML input (CVE-2016-2099)

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

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote Ubuntu 16.04 ESM / 18.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4784-1 advisory.

    It was discovered that Xerces-C++ XML Parser mishandles certain kinds of external DTD references,     resulting in a user-after-free. An attacker could use this vulnerability to cause a denial of service     (crash) or possibly execute arbitrary code. This issue affected only Ubuntu 16.04 ESM. (CVE-2016-2099)

    It was discovered that Xerces-C++ XML Parser fails to successfully parse a DTD that is too deeply nested.
    An unauthenticated attacker could use this vulnerability to cause a denial of service. This issue affected     only Ubuntu 16.04 ESM. (CVE-2016-4463)

    It was discovered that Xerces-C++ mishandles certain kinds of external DTD references, resulting in     dereference of a NULL pointer. An attacker could use this vulnerability to cause a denial of service.
    (CVE-2017-12627)

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.

Use-after-free vulnerability in validators/DTD/DTDScanner.cpp in Apache Xerces C++ 3.1.3 and earlier does not properly handle exceptions raised in the XMLReader class, which allows context-dependent attackers to have unspecified impact via an invalid character in an XML document. (CVE-2016-2099)

The remote host is affected by the vulnerability described in GLSA-201612-46 (Xerces-C++: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xerces-C++. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could entice a user to process a specially crafted       file, possibly resulting in the remote execution of arbitrary code with       the privileges of the process, or a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

xerces-c was updated to fix one security issue.

This security issue was fixed :

  - CVE-2016-2099: Use-after-free vulnerability in     validators/DTD/DTDScanner.cpp in Apache Xerces C++ did     not properly handle exceptions raised in the XMLReader     class, which allowed context-dependent attackers to have     unspecified impact via an invalid character in an XML     document (bsc#979208).

  - CVE-2016-4463: Apache Xerces-C XML Parser crashed on     malformed DTD (bnc#985860). This update was imported     from the SUSE:SLE-12:Update update project.

xerces-c was updated to fix one security issue. This security issue was fixed :

  - CVE-2016-2099: Use-after-free vulnerability in     validators/DTD/DTDScanner.cpp in Apache Xerces C++ did     not properly handle exceptions raised in the XMLReader     class, which allowed context-dependent attackers to have     unspecified impact via an invalid character in an XML     document (bsc#979208).

  - CVE-2016-4463: Apache Xerces-C XML Parser crashed on     malformed DTD (bnc#985860).

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.

Apache reports :

The Xerces-C XML parser fails to successfully parse a DTD that is deeply nested, and this causes a stack overflow, which makes a denial of service attack against many applications possible by an unauthenticated attacker.

Also, CVE-2016-2099: Use-after-free vulnerability in validators/DTD/DTDScanner.cpp in Apache Xerces C++ 3.1.3 and earlier allows context-dependent attackers to have unspecified impact via an invalid character in an XML document.

This update for xerces-c fixes the following issues :

  - CVE-2016-4463 Apache Xerces-C XML Parser Crashes on     Malformed DT (boo#985860) 

  - CVE-2016-2099 Exception handling mistake causing use     after free (boo#979208)

Update to xerces-c 3.1.4, fixing CVE-2016-2099 and CVE-2016-4463

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.

MinGW cross compiled xerces-c 3.1.4, fixing CVE-2016-0729, CVE-2016-2099 and CVE-2016-4463

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.

xerces-c was updated to fix one security issue.

This security issue was fixed :

  - CVE-2016-2099: Use-after-free vulnerability in     validators/DTD/DTDScanner.cpp in Apache Xerces C++. It     did not properly handle exceptions raised in the     XMLReader class, which allowed context-dependent     attackers to have unspecified impact via an invalid     character in an XML document (bsc#979208).

Gustavo Grieco discovered an use-after-free vulnerability in xerces-c, a validating XML parser library for C++, due to not properly handling invalid characters in XML input documents in the DTDScanner.

XMLReader class can raise an exception if an invalid character is encountered, and the exception crosses stack frames in an unsafe way that causes a higher level exception handler to access an already-freed object.

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.

ID	Name	Product	Family	Severity
199305	RHEL 6 : xerces-c (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
199296	RHEL 7 : xerces-c (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
195582	RHEL 7 : xerces-c (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
195547	RHEL 6 : xerces-c (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
183141	Ubuntu 16.04 ESM / 18.04 ESM : Xerces-C++ vulnerabilities (USN-4784-1)	Nessus	Ubuntu Local Security Checks	critical
105466	F5 Networks BIG-IP : Apache Xerces vulnerability (K04253390)	Nessus	F5 Networks Local Security Checks	critical
96126	GLSA-201612-46 : Xerces-C++: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
93336	openSUSE Security Update : xerces-c (openSUSE-2016-1046)	Nessus	SuSE Local Security Checks	critical
93308	SUSE SLED12 / SLES12 Security Update : xerces-c (SUSE-SU-2016:2154-1)	Nessus	SuSE Local Security Checks	critical
92575	FreeBSD : xercesi-c3 -- multiple vulnerabilities (cb09a7aa-5344-11e6-a7bd-14dae9d210b8)	Nessus	FreeBSD Local Security Checks	critical
92354	openSUSE Security Update : xerces-c (openSUSE-2016-876)	Nessus	SuSE Local Security Checks	critical
92291	Fedora 23 : xerces-c (2016-d2d6890690)	Nessus	Fedora Local Security Checks	critical
92267	Fedora 24 : xerces-c (2016-9284772686)	Nessus	Fedora Local Security Checks	critical
92263	Fedora 23 : mingw-xerces-c (2016-87e8468465)	Nessus	Fedora Local Security Checks	critical
92262	Fedora 22 : xerces-c (2016-84373c5f4f)	Nessus	Fedora Local Security Checks	critical
92257	Fedora 22 : mingw-xerces-c (2016-7615febbd6)	Nessus	Fedora Local Security Checks	critical
92226	Fedora 24 : mingw-xerces-c (2016-0a061f6dd9)	Nessus	Fedora Local Security Checks	critical
91953	openSUSE Security Update : xerces-c (openSUSE-2016-833)	Nessus	SuSE Local Security Checks	critical
91174	Debian DSA-3579-1 : xerces-c - security update	Nessus	Debian Local Security Checks	critical
91107	Debian DLA-467-1 : xerces-c security update	Nessus	Debian Local Security Checks	critical

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CVE-2016-2099

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