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Category:   Application (Generic)  >   X Vendors:   X.org
X Buffer Overflow in Processing CID-encoded Type1 Fonts Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1016828
SecurityTracker URL:  http://securitytracker.com/id/1016828
CVE Reference:   CVE-2006-3739, CVE-2006-3740   (Links to External Site)
Updated:  Sep 13 2006
Original Entry Date:  Sep 12 2006
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.1 and prior versions
Description:   A vulnerability was reported in X. A remote authenticated user can execute arbitrary code on the target system.

The software does not properly validate data when parsing CID-encoded Type1 fonts. A remote authenticated user with the ability to set the X server font path can set the path to point to a specially crafted font to trigger an integer overflow in the "type1" module and execute arbitrary code on the target system.

The scan_cidfont() function in 'Type1/scanfont.c' is affected [CVE-2006-3739]. The CIDADM() function in 'Type1/afm.c' is affected [CVE-2006-3740].

The vendor credits iDefense with reporting these vulnerabilities.

Impact:   A remote authenticated user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (libXfont 1.2.1).

The following patches for earlier versions are available.

For earlier versions, apply one of the following patches:

X.Org 6.8.2

<http://xorg.freedesktop.org/releases/X11R6.8.2/patches/>
3943de39723099857403a50bea2b4408 xorg-68x-cidfonts.patch
1ff2c998453e233f9278be76ccb8a827cabbb067 xorg-68x-cidfonts.patch

X.Org 6.9.0

<http://xorg.freedesktop.org/releases/X11R6.9.0/patches/>
MD5: 7c0c53f1c7ffd97b429eda1eefdff9cb x11r6.9.0-cidfonts.diff
SHA1: bdb3b086e18fa1ee81020fa6a0657f097db7d037 x11r6.9.0-cidfonts.diff

X.Org 7.0 - libXfont 1.0.0

<http://xorg.freedesktop.org/releases/X11R7.0/patches/>
MD5: 8bcbe12444326fab69f8a899c78519ea libXfont-1.0.0-cidfonts.diff
SHA1: b0778179be6a52c5f10ddbb7cd349c06c3c8bd2d libXfont-1.0.0-cidfonts.diff

X.Org 7.1 - libXfont 1.1.0

<http://xorg.freedesktop.org/releases/X11R7.1/patches/>
MD5: 8bcbe12444326fab69f8a899c78519ea libXfont-1.1.0-cidfonts.diff
SHA1: b0778179be6a52c5f10ddbb7cd349c06c3c8bd2d libXfont-1.1.0-cidfonts.diff

Vendor URL:  www.x.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 13 2006 (Red Hat Issues Fix) X Buffer Overflow in Processing CID-encoded Type1 Fonts Lets Remote Users Execute Arbitrary Code
Red Hat has released a fix for Red Hat Enterprise Linux 4.
Sep 13 2006 (Red Hat Issues Fix for XFree86) X Buffer Overflow in Processing CID-encoded Type1 Fonts Lets Remote Users Execute Arbitrary Code
Red Hat has released a fix for XFree86 for Red Hat Enterprise Linux 2.1 and 3.
Sep 22 2006 (NetBSD Issues Fix) X Buffer Overflow in Processing CID-encoded Type1 Fonts Lets Remote Users Execute Arbitrary Code
NetBSD has released a fix.
Mar 30 2007 (VMware Issues Fix for ESX Server) X Buffer Overflow in Processing CID-encoded Type1 Fonts Lets Remote Users Execute Arbitrary Code
VMware has issued a fix for VMware ESX Server.



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