#VU32709 Input validation error in libxslt - CVE-2012-6139

Vulnerability identifier: #VU32709

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-6139

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libxslt
Universal components / Libraries / Libraries used by multiple products

Vendor: Gnome Development Team

Description

The vulnerability allows remote attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can 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.

Mitigation
Update to version 1.1.28.

Vulnerable software versions

libxslt: 1.1.0 - 1.1.27

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2013-April/102065.html
https://lists.opensuse.org/opensuse-updates/2013-04/msg00020.html
https://lists.opensuse.org/opensuse-updates/2013-04/msg00028.html
https://secunia.com/advisories/52745
https://secunia.com/advisories/52805
https://secunia.com/advisories/52813
https://secunia.com/advisories/52884
https://www.debian.org/security/2013/dsa-2654
https://www.mandriva.com/security/advisories?name=MDVSA-2013:141
https://www.securitytracker.com/id/1028338
https://www.ubuntu.com/usn/USN-1784-1
https://xmlsoft.org/XSLT/news.html
https://bugzilla.gnome.org/show_bug.cgi?id=685328
https://bugzilla.gnome.org/show_bug.cgi?id=685330
https://git.gnome.org/browse/libxslt/commit/?id=6c99c519d97e5fcbec7a9537d190efb442e4e833
https://git.gnome.org/browse/libxslt/commit/?id=dc11b6b379a882418093ecc8adf11f6166682e8d
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0107
https://www.suse.com/support/update/announcement/2013/suse-su-20131654-1.html
https://www.suse.com/support/update/announcement/2013/suse-su-20131656-1.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.