The htmlParseNameComplex function in HTMLparser.c in libxml2 allows attackers to cause a denial of service (out-of-bounds read) via a crafted XML document.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Heap-based buffer overflow in the xmlStrncat function 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, allows remote attackers to
    execute arbitrary code or cause a denial of service (memory corruption) via a crafted XML document.
    (CVE-2016-1834)

  - The xmlNextChar function in libxml2 before 2.9.4 allows remote attackers to cause a denial of service
    (heap-based buffer over-read) via a crafted XML document. (CVE-2016-1762)

  - The htmlCurrentChar function 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, allows remote attackers to cause a denial of service
    (heap-based buffer over-read) via a crafted XML document. (CVE-2016-1833)

  - Use-after-free vulnerability in the xmlSAX2AttributeNs function in libxml2 before 2.9.4, as used in Apple
    iOS before 9.3.2 and OS X before 10.11.5, allows remote attackers to cause a denial of service via a
    crafted XML document. (CVE-2016-1835)

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.

The remote host is affected by the vulnerability described in GLSA-201701-37 (libxml2: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in libxml2. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could entice a user or automated system to process a       specially crafted XML document, possibly resulting in 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.

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.

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.

ID	Name	Product	Family	Severity
401038	Alpine: multiple libxml2 packages, multiple py3-libxml2 packages: security update to 2.9.3-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	high
401038	Alpine: multiple libxml2 packages, multiple py3-libxml2 packages: security update to 2.9.3-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	critical
96541	GLSA-201701-37 : libxml2: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
93154	SUSE SLES11 Security Update : libxml2 (SUSE-SU-2016:1604-1)	Nessus	SuSE Local Security Checks	critical
91656	SUSE SLED12 / SLES12 Security Update : libxml2 (SUSE-SU-2016:1538-1)	Nessus	SuSE Local Security Checks	critical
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

Detections

Analytics

CVE-2016-2073

medium

Tenable Plugins

high

high

critical

critical

critical

critical

critical

high

high

high