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Vigil@nce: GNU Enscript, buffer overflow via escape setfilename

November 2008 by Vigil@nce

SYNTHESIS

An attacker can invite the victim to convert a malicious file with
GNU Enscript in order to execute code on his computer.

Gravity: 2/4

Consequences: user access/rights

Provenance: document

Means of attack: 1 attack

Ability of attacker: technician (2/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: medium (2/3)

Creation date: 06/11/2008

IMPACTED PRODUCTS

 Fedora
 Novell Linux Desktop
 Novell Open Enterprise Server
 OpenSUSE
 SuSE Linux
 SUSE LINUX Enterprise Server
 Unix - plateform

DESCRIPTION

The GNU Enscript program converts a text file to PostScript, HTML
or RTF.

The "-e" option of enscript enables the support of special
patterns escaped by the null character (by default). For example,
a text document can contain:
\x00bgcolorr g b : indicates the background color
\x00setfilenamefilename : indicates the file to use
etc.

The read_special_escape() function of the src/psgen.c file
analyses these special patterns. When the "setfilename" pattern is
used, the file name (its size can be up to 4096 bytes) is copied
to a 512 bytes array, which creates an overflow.

An attacker can therefore create a text file containing a
malicious "setfilename" pattern, and invite the victim to open it
with "enscript -e" in order to execute code on his computer.

CHARACTERISTICS

Identifiers: BID-31858, CVE-2008-3863, FEDORA-2008-9351,
FEDORA-2008-9372, SUSE-SR:2008:024, VIGILANCE-VUL-8225

http://vigilance.fr/vulnerability/8225


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