Secunia Security Advisory - Some vulnerabilities have been reported in libXfont, which can be exploited by malicious, local users to gain escalated privileges.
2ce0d436ab1cfc0105249143db57a5088260f5c1bc175cd0e337a24320be8411
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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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