Input validation error in libxslt for Libxml2

1) Input validation error

EUVDB-ID: #VU32709

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 - Improper input validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:gnome:libxslt:1.1.0:*:*:*:*:libxml2:*:*
• cpe:2.3:a:gnome:libxslt:1.1.1:*:*:*:*:libxml2:*:*
• cpe:2.3:a:gnome:libxslt:1.1.2:*:*:*:*:libxml2:*:*

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

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.