libxslt has been updated to fix two denial of service issues via crashes by NULL pointer dereference on attacker supplied XSLT scripts.
(CVE-2012-6139)

Two denial of service problems (crashes with NULL pointer derference) were fixed in libxslt, which could potentially be used by remote attackers to crash libxslt using programs.

Nicolas Gregoire discovered that libxslt, an XSLT processing runtime library, is prone to denial of service vulnerabilities via crafted XSL stylesheets.

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.

libxslt received a security update to fix a security issue :

  - The XSL implementation in libxslt allowed remote     attackers to cause a denial of service (crash) via an     invalid DTD. (addendum due to incomplete fix for     CVE-2012-2825). (CVE-2013-4520)

Updated libxslt packages fix security vulnerability :

Nicholas Gregoire discovered that libxslt incorrectly handled certain empty values. If a user or automated system were tricked into processing a specially crafted XSLT document, a remote attacker could cause libxslt to crash, causing a denial of service (CVE-2012-6139).

The remote host is affected by the vulnerability described in GLSA-201401-07 (libxslt: Denial of Service)

    Multiple vulnerabilities have been found in libxslt:
      Multiple errors exist in pattern.c and functions.c (CVE-2012-2870,         CVE-2012-6139).
      A double-free error exists in templates.c (CVE-2012-2893).
      A NULL pointer dereference in keys.c (CVE-2012-6139).
      An error in handling stylesheets containing DTDs (CVE-2013-4520).
  Impact :

    A remote attacker could entice a user to process a specially crafted       file in an application linked against libxslt, possibly resulting in a       Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Nicholas Gregoire discovered that libxslt incorrectly handled certain empty values. If a user or automated system were tricked into processing a specially crafted XSLT document, a remote attacker could cause libxslt to crash, causing a denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Update to libxslt-1.1.28 to fix CVE-2012-6139 where the library could crash on invalid key references in stylesheets

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Solaris system is missing necessary patches to address security updates :

  - libxslt before 1.1.28 allows remote attackers to cause a     denial of service (NULL pointer dereference and crash)     via an (1) empty match attribute in a XSL key to the     xsltAddKey function in keys.c or (2) uninitialized     variable to the xsltDocumentFunction function in     functions.c. (CVE-2012-6139)

ID	Name	Product	Family	Published	Updated	Severity
66290	SuSE 10 Security Update : libxslt (ZYPP Patch Number 8534)	Nessus	SuSE Local Security Checks	5/1/2013	1/19/2021	medium
74951	openSUSE Security Update : libxslt (openSUSE-SU-2013:0585-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	medium
66288	SuSE 11.2 Security Update : libxslt (SAT Patch Number 7569)	Nessus	SuSE Local Security Checks	5/1/2013	1/19/2021	medium
65793	Debian DSA-2654-1 : libxslt - denial of service	Nessus	Debian Local Security Checks	4/4/2013	1/11/2021	medium
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	6/30/2023	7/6/2023	critical
70843	SuSE 11.2 / 11.3 Security Update : libxslt (SAT Patch Numbers 8500 / 8501)	Nessus	SuSE Local Security Checks	11/12/2013	1/19/2021	medium
66153	Mandriva Linux Security Advisory : libxslt (MDVSA-2013:141)	Nessus	Mandriva Local Security Checks	4/20/2013	1/6/2021	medium
71907	GLSA-201401-07 : libxslt: Denial of Service	Nessus	Gentoo Local Security Checks	1/12/2014	1/6/2021	medium
65786	Ubuntu 8.04 LTS / 10.04 LTS / 11.10 / 12.04 LTS / 12.10 : libxslt vulnerability (USN-1784-1)	Nessus	Ubuntu Local Security Checks	4/3/2013	9/19/2019	medium
66005	Fedora 18 : libxslt-1.1.28-1.fc18 (2013-4507)	Nessus	Fedora Local Security Checks	4/18/2013	1/11/2021	medium
80694	Oracle Solaris Third-Party Patch Update : libxslt (cve_2012_5581_denial_of1)	Nessus	Solaris Local Security Checks	1/19/2015	1/14/2021	medium

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