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.

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.

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

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)

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 version of Apple iTunes running on the remote Windows host is prior to 12.4.2. It is, therefore, affected by multiple vulnerabilities :

  - Multiple memory corruption issues exist in the libxslt     component due to improper validation of user-supplied     input. An unauthenticated, remote attacker can exploit     this to cause a denial of service condition or the     execution of arbitrary code. (CVE-2016-1684,     CVE-2016-4607, CVE-2016-4608, CVE-2016-4609,     CVE-2016-4610, CVE-2016-4612)

  - Multiple memory corruption issues exist in the libxml2     component that allow a remote attacker to cause a denial     of service condition or the execution of arbitrary code.
    (CVE-2016-1836, CVE-2016-4447, CVE-2016-4448,     CVE-2016-4483, CVE-2016-4614, CVE-2016-4615,     CVE-2016-4616, CVE-2016-4619)

  - An XXE (Xml eXternal Entity) injection vulnerability     exists in the libxml2 component due to an incorrectly     configured XML parser accepting XML external entities     from an untrusted source. A remote attacker can exploit     this, via a specially crafted XML file, to disclose     arbitrary files and user information. (CVE-2016-4449)

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 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.

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 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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Use-after-free vulnerability in the xmlDictComputeFastKey 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 via a crafted XML document. (CVE-2016-1836)

Note that Nessus relies on the presence of the package as reported by the vendor.

According to its banner, the version of the remote Apple TV device is prior to 9.2.2. It is, therefore, affected by multiple vulnerabilities in the following components :

  - CoreGraphics
  - ImageIO
  - IOAcceleratorFamily
  - IOHIDFamily
  - Kernel
  - libxml2
  - libxslt
  - Sandbox Profiles
  - WebKit
  - WebKit Page Loading

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

The version of iOS running on the mobile device is prior to 9.3.3. It is, therefore, affected by multiple vulnerabilities, the most serious of which can result in remote code execution, in the following components :

  - Calendar
  - CoreGraphics
  - FaceTime
  - ImageIO
  - IOAcceleratorFamily
  - IOHIDFamily
  - Kernel
  - libxml2
  - libxslt
  - Safari
  - Sandbox Profiles
  - Siri Contacts
  - Web Media
  - WebKit
  - WebKit JavaScript Bindings
  - WebKit Page Loading

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 running a version of Mac OS X that is 10.11.x prior to 10.11.6. It is, therefore, affected by multiple vulnerabilities in the following components :

  - apache_mod_php
  - Audio
  - bsdiff
  - CFNetwork
  - CoreGraphics
  - FaceTime
  - Graphics Drivers
  - ImageIO
  - Intel Graphics Driver
  - IOHIDFamily
  - IOKit
  - IOSurface
  - Kernel
  - libc++abi
  - libexpat
  - LibreSSL
  - libxml2
  - libxslt
  - Login Window
  - OpenSSL
  - QuickTime
  - Safari Login AutoFill
  - Sandbox Profiles

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
91447	Debian DSA-3593-1 : libxml2 - security update	Nessus	Debian Local Security Checks	2016/6/3	2021/1/11	high
91499	Ubuntu 14.04 LTS / 16.04 LTS : libxml2 vulnerabilities (USN-2994-1)	Nessus	Ubuntu Local Security Checks	2016/6/7	2024/8/27	high
91640	openSUSE Security Update : libxml2 (openSUSE-2016-734)	Nessus	SuSE Local Security Checks	2016/6/17	2021/1/19	high
91802	RHEL 6 / 7 : libxml2 (RHSA-2016:1292)	Nessus	Red Hat Local Security Checks	2016/6/24	2020/4/8	critical
91808	Scientific Linux Security Update : libxml2 on SL6.x, SL7.x i386/x86_64 (20160623)	Nessus	Scientific Linux Local Security Checks	2016/6/24	2021/1/14	critical
92411	Apple iTunes < 12.4.2 Multiple Vulnerabilities (uncredentialed check)	Nessus	Peer-To-Peer File Sharing	2016/7/19	2026/1/30	critical
96541	GLSA-201701-37 : libxml2: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2017/1/17	2026/1/5	critical
99491	Fedora 25 : libxml2 (2017-a3a47973eb)	Nessus	Fedora Local Security Checks	2017/4/20	2025/12/25	critical
99492	Fedora 24 : libxml2 (2017-be8574d593)	Nessus	Fedora Local Security Checks	2017/4/20	2025/12/25	critical
91225	Apple iOS < 9.3.2 Multiple Vulnerabilities	Nessus	Mobile Devices	2016/5/18	2026/3/23	high
219285	Linux Distros Unpatched Vulnerability : CVE-2016-1836	Nessus	Misc.	2025/3/4	2026/1/28	medium
92494	Apple TV < 9.2.2 Multiple Vulnerabilities	Nessus	Misc.	2016/7/21	2026/1/30	critical
92359	Apple iOS < 9.3.3 Multiple Vulnerabilities	Nessus	Mobile Devices	2016/7/19	2026/3/23	critical
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	2023/6/30	2023/7/6	critical
92496	Mac OS X 10.11.x < 10.11.6 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	2016/7/21	2024/5/28	critical

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