libxslt "xsltDocumentFunction()" and "xsltAddKey()" Denial of Service Vulnerabilities

2013-03-25 / 2013-03-26

Credit: Agostino Sarubbo

Risk: Medium

Local: Yes

Remote: Yes

CVE: CVE-2012-6139

CWE: CWE-Other

CVSS Base Score: 5/10

Impact Subscore: 2.9/10

Exploitability Subscore: 10/10

Exploit range: Remote

Attack complexity: Low

Authentication: No required

Confidentiality impact: None

Integrity impact: None

Availability impact: Partial

From the secunia advisory: https://secunia.com/advisories/52805/
1) An error within the "xsltDocumentFunction()" function (libxslt/functions.c)
when parsing XSL templates can be exploited to cause a crash.
Commit code:
http://git.gnome.org/browse/libxslt/commit/?id=6c99c519d97e5fcbec7a9537d190efb442e4e833
2) A NULL-pointer dereference error within the "xsltAddKey()" function
(libxslt/keys.c) when parsing XSL keys can be exploited to cause a crash.
Commit code:
http://git.gnome.org/browse/libxslt/commit/?id=dc11b6b379a882418093ecc8adf11f6166682e8d
Both issue are fixed in the version 1.1.28
--
Agostino Sarubbo
Gentoo Linux Developer

References:

http://git.gnome.org/browse/libxslt/commit/?id=6c99c519d97e5fcbec7a9537d190efb442e4e833

http://git.gnome.org/browse/libxslt/commit/?id=dc11b6b379a882418093ecc8adf11f6166682e8d

https://secunia.com/advisories/52805/

See this note in RAW Version

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libxslt "xsltDocumentFunction()" and "xsltAddKey()" Denial of Service Vulnerabilities

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