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Vigil@nce: libxml2, two vulnerabilities

November 2008 by Vigil@nce

SYNTHESIS

An attacker can create a special XML file in order to create a
denial of service or to execute code when it is analyzed by
libxml2.

Gravity: 2/4

Consequences: user access/rights, denial of service of service

Provenance: document

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Number of vulnerabilities in this bulletin: 2

Creation date: 17/11/2008

IMPACTED PRODUCTS

 Debian Linux
 Fedora
 Mandriva Corporate
 Mandriva Linux
 Red Hat Enterprise Linux
 Slackware Linux
 Unix - plateform

DESCRIPTION

The libxml2 library implements features to handle data in the XML
format. It has two vulnerabilities.

A big XML file generates an integer overflow in the
xmlSAX2Characters() function of SAX2.c, leading to code execution.
[grav:2/4; 470466, BID-32326, CVE-2008-4226]

A big XML file generates an infinite loop in the xmlBufferResize()
function of tree.c. [grav:1/4; 470480, BID-32331, CVE-2008-4225]

An attacker can therefore create a big XML file in order to create
a denial of service or to execute code when it is analyzed by
libxml2.

CHARACTERISTICS

Identifiers: 470466, 470480, BID-32326, BID-32331, CVE-2008-4225,
CVE-2008-4226, DSA 1666-1, FEDORA-2008-10000, FEDORA-2008-9729, FEDORA-2008-9773, MDVSA-2008:231, RHSA-2008:0988-01, SSA:2008-324-01, VIGILANCE-VUL-8250

http://vigilance.fr/vulnerability/8250


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