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.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2016-545:01 advisory.

    This library allows to manipulate XML files. It includes support     to read, modify and write XML and HTML files. There is DTDs support     this includes parsing and validation even with complex DtDs, either     at parse time or later once the document has been modified. The output     can be a simple SAX stream or and in-memory DOM like representations.
    In this case one can use the built-in XPath and XPointer implementation     to select sub nodes or ranges. A flexible Input/Output mechanism is     available, with existing HTTP and FTP modules and combined to an     URI library.
    Security issues fixed with this release:
    CVE-2016-1762     libxml2 in Apple iOS before 9.3, OS X before 10.11.4, Safari before     9.1, tvOS before 9.2, and watchOS before 2.2 allows remote attackers     to execute arbitrary code or cause a denial of service (memory     corruption) via a crafted XML document.
    CVE-2016-1833     libxml2, 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, a different vulnerability than     CVE-2016-1834, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1834     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1835     libxml2, as used in Apple iOS before 9.3.2 and OS X before 10.11.5,     allows remote attackers to execute arbitrary code or cause a denial of     service (memory corruption) via a crafted XML document.
    CVE-2016-1836     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1837     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1838     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1839     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1840.
    CVE-2016-1840     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1839.
    CVE-2016-3627     The xmlStringGetNodeList function in tree.c in libxml2 2.9.3 and     earlier, when used in recovery mode, allows context-dependent     attackers to cause a denial of service (infinite recursion, stack     consumption, and application crash) via a crafted XML document.
    CVE-2016-3705     The (1) xmlParserEntityCheck and (2) xmlParseAttValueComplex functions     in parser.c in libxml2 2.9.3 do not properly keep track of the     recursion depth, which allows 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.
    CVE-2016-4447     The xmlParseElementDecl function in parser.c in libxml2 before 2.9.4     allows context-dependent attackers to cause a denial of service     (heap-based buffer underread and application crash) via a crafted     file, involving xmlParseName.
    CVE-2016-4448     Format string vulnerability in libxml2 before 2.9.4 allows attackers     to have unspecified impact via format string specifiers in unknown     vectors.
    CVE-2016-4449     XML external entity (XXE) vulnerability in the     xmlStringLenDecodeEntities function in parser.c in libxml2 before     2.9.4, when not in validating mode, allows context-dependent attackers     to read arbitrary files or cause a denial of service (resource     consumption) via unspecified vectors.

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

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

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

  - The xmlDictAddString 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-2016-1839)

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

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)

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.

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.

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 issues :

  - CVE-2017-9047, CVE-2017-9048: The function     xmlSnprintfElementContent in valid.c was vulnerable to a     stack-based buffer overflow (bsc#1039063, bsc#1039064)

  - CVE-2017-9049: The function xmlDictComputeFastKey in     dict.c was vulnerable to a heap-based buffer over-read.
    (bsc#1039066)

  - CVE-2017-9050: The function xmlDictAddString was     vulnerable to a heap-based buffer over-read     (bsc#1039661)

  - CVE-2016-1839: heap-based buffer overflow     (xmlDictAddString func) (bnc#1039069)

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

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2016-544:01 advisory.

    Description:
    This library allows to manipulate XML files. It includes support     to read, modify and write XML and HTML files. There is DTDs support     this includes parsing and validation even with complex DtDs, either     at parse time or later once the document has been modified. The output     can be a simple SAX stream or and in-memory DOM like representations.
    In this case one can use the built-in XPath and XPointer implementation     to select subnodes or ranges. A flexible Input/Output mechanism is     available, with existing HTTP and FTP modules and combined to an     URI library.
    Security issues fixed with this release:
    CVE-2016-1762     libxml2 in Apple iOS before 9.3, OS X before 10.11.4, Safari before     9.1, tvOS before 9.2, and watchOS before 2.2 allows remote attackers     to execute arbitrary code or cause a denial of service (memory     corruption) via a crafted XML document.
    CVE-2016-1833     libxml2, 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, a different vulnerability than     CVE-2016-1834, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1834     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1835     libxml2, as used in Apple iOS before 9.3.2 and OS X before 10.11.5,     allows remote attackers to execute arbitrary code or cause a denial of     service (memory corruption) via a crafted XML document.
    CVE-2016-1836     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1837, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1837     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1838,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1838     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1839, and CVE-2016-1840.
    CVE-2016-1839     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1840.
    CVE-2016-1840     libxml2, 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, a different vulnerability than     CVE-2016-1833, CVE-2016-1834, CVE-2016-1836, CVE-2016-1837,     CVE-2016-1838, and CVE-2016-1839.
    CVE-2016-3627     The xmlStringGetNodeList function in tree.c in libxml2 2.9.3 and     earlier, when used in recovery mode, allows context-dependent     attackers to cause a denial of service (infinite recursion, stack     consumption, and application crash) via a crafted XML document.
    CVE-2016-3705     The (1) xmlParserEntityCheck and (2) xmlParseAttValueComplex functions     in parser.c in libxml2 2.9.3 do not properly keep track of the     recursion depth, which allows 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.
    CVE-2016-4447     The xmlParseElementDecl function in parser.c in libxml2 before 2.9.4     allows context-dependent attackers to cause a denial of service     (heap-based buffer underread and application crash) via a crafted     file, involving xmlParseName.
    CVE-2016-4448     Format string vulnerability in libxml2 before 2.9.4 allows attackers     to have unspecified impact via format string specifiers in unknown     vectors.
    CVE-2016-4449     XML external entity (XXE) vulnerability in the     xmlStringLenDecodeEntities function in parser.c in libxml2 before     2.9.4, when not in validating mode, allows context-dependent attackers     to read arbitrary files or cause a denial of service (resource     consumption) via unspecified vectors.

Tenable has extracted the preceding description block directly from the MiracleLinux 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 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)

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
289699	MiracleLinux 7 : libxml2-2.9.1-6.0.1.el7.AXS7.3 (AXSA:2016-545:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	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
219307	Linux Distros Unpatched Vulnerability : CVE-2016-1839	Nessus	Misc.	2025/3/4	2026/9/2	medium
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
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	2023/6/30	2023/7/6	critical
91639	openSUSE Security Update : libxml2 (openSUSE-2016-733)	Nessus	SuSE Local Security Checks	2016/6/17	2021/1/19	critical
91656	SUSE SLED12 / SLES12 Security Update : libxml2 (SUSE-SU-2016:1538-1)	Nessus	SuSE Local Security Checks	2016/6/17	2021/1/6	critical
93154	SUSE SLES11 Security Update : libxml2 (SUSE-SU-2016:1604-1)	Nessus	SuSE Local Security Checks	2016/8/29	2026/1/28	critical
100708	openSUSE Security Update : libxml2 (openSUSE-2017-663)	Nessus	SuSE Local Security Checks	2017/6/9	2025/12/16	high
289734	MiracleLinux 4 : libxml2-2.7.6-21.1.0.1.AXS4 (AXSA:2016-544:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
97893	Tenable Log Correlation Engine (LCE) < 4.8.1 Multiple Vulnerabilities	Nessus	Misc.	2017/3/22	2025/12/29	critical

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