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>> X.Org X11 "CIDAFM()" and "scan_cidfont()" Local Privilege Escalation Vulnerabilities

Title : X.Org X11 "CIDAFM()" and "scan_cidfont()" Local Privilege Escalation Vulnerabilities
VUPEN ID : VUPEN/ADV-2006-3581
CVE ID : CVE-2006-3739 - CVE-2006-3740
Rated as : Moderate Risk 
Remotely Exploitable : No
Locally Exploitable : Yes
Release Date : 2006-09-13


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Two vulnerabilities have been identified in X.Org X11, which could be exploited by malicious users to obtain elevated privileges or cause a denial of service.

The first issue is due to an integer overflow error in the "CIDAFM()" [Type1/afm.c] function when processing AFM (Adobe Font Metrics) files, which could be exploited by local attackers to execute arbitrary commands with root privileges.

The second flaw is due to an integer overflow error in the "scan_cidfont()" [Type1/scanfont.c] function when processing malformed "CMap" and "CIDFont" font data, which could be exploited by local attackers to execute arbitrary commands with root privileges.

Affected Products

X.Org X11 versions 6.7.0 through 7.1
X.Org libXfont versions 1.2.x

Solution

Upgrade to libXfont version 1.2.2 :
http://xorg.freedesktop.org/releases/individual/lib/

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

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

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

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

References

http://www.vupen.com/english/advisories/2006/3581
http://lists.freedesktop.org/archives/xorg/2006-September/018021.html
http://idefense.com/intelligence/vulnerabilities/display.php?id=412
http://idefense.com/intelligence/vulnerabilities/display.php?id=411

Credits

Vulnerabilities reported by iDEFENSE

ChangeLog

2006-09-13 : Initial release

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