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Vigil@nce - libxslt: denial of service of xsltDocumentFunction

April 2013 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can create a malicious XSL file using document(), and
send it to applications linked to libxslt, in order to stop them.

Impacted products: Debian, openSUSE, Unix (platform)

Severity: 2/4

Creation date: 25/03/2013

DESCRIPTION OF THE VULNERABILITY

The XSLT document() function is used to access to node of an
external XML document.

The xsltDocumentFunction() function of the libxslt/functions.c
file implements XSLT document(). However when the parameter of the
document() function is an uninitialized variable, the
xsltDocumentFunction() function dereferences a NULL pointer.

An attacker can therefore create a malicious XSL file using
document(), and send it to applications linked to libxslt, in
order to stop them.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/libxslt-denial-of-service-of-xsltDocumentFunction-12565


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