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TITLE:
X11 libXfont CID Encoded Fonts Integer Overflows

SECUNIA ADVISORY ID:
SA21864

VERIFY ADVISORY:
http://secunia.com/advisories/21864/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
X Window System 11 (X11) 6.x
http://secunia.com/product/3913/
X Window System 11 (X11) 7.x
http://secunia.com/product/8806/

DESCRIPTION:
Some vulnerabilities have been reported in libXfont, which can be
exploited by malicious, local users to gain escalated privileges.

The vulnerabilities are caused due to integer overflows within the
"scan_cid()" function when handling CMAP and CIDFont data and the
"CIDADM()" function when parsing AFM (Adobe Font Metric) files. These
can be exploited to cause buffer overflows via specially crafted CID
encoded Type1 fonts.

Successful exploitation may allow execution of arbitrary code with
escalated privileges, but requires access to the "xset fp+" command
or similar.

The vulnerabilities have been reported in X11 X.Org 6.7.0. through
7.1.

SOLUTION:
Update to libXfont 1.2.2 or apply patches.

X11 X.Org 6.8.2:
http://xorg.freedesktop.org/releases/X11R6.8.2/patches/xorg-68x-cidfonts.patch

X11 X.Org 6.9.0:
http://xorg.freedesktop.org/releases/X11R6.9.0/patches/x11r6.9.0-cidfonts.diff

X11 X.Org 7.0 / libXfont 1.0.0:
http://xorg.freedesktop.org/releases/X11R7.0/patches/libXfont-1.0.0-cidfonts.diff

X11 X.Org 7.1 / libXfont 1.1.0:
http://xorg.freedesktop.org/releases/X11R7.1/patches/libXfont-1.1.0-cidfonts.diff

PROVIDED AND/OR DISCOVERED BY:
Discovered by an anonymous person and reported via iDEFENSE.

ORIGINAL ADVISORY:
X.Org:
http://lists.freedesktop.org/archives/xorg/2006-September/018021.html

iDEFENSE:
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=411
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=412

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About:
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