Input validation error in libxslt for Libxml2

1) Input validation error

EUVDB-ID: #VU32709

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

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

External links

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