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Category:   Application (Generic)  >   X Vendors:   X.org
(IBM Issues Fix for AIX) X Server Bugs in XFree86, Xinput, TOG-CUP, MIT-SHM, and EVI Extensions Let Local Users Gain Root Privileges
SecurityTracker Alert ID:  1019521
SecurityTracker URL:  http://securitytracker.com/id/1019521
CVE Reference:   CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, CVE-2008-0006   (Links to External Site)
Date:  Feb 28 2008
Impact:   Disclosure of system information, Disclosure of user information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.3
Description:   Several vulnerabilities were reported in X. A local user can obtain root privileges on the target system. A local user can determine whether certain files or directories exist on the target system.

A local user can exploit any of several memory corruption errors in the X server to execute arbitrary code with the privileges of the target X server (typically root level privileges).

A local user can supply a specially PassMessage request to cause an out-of-bounds array index error and trigger a pointer dereference in the XFree86 Misc extension [CVE-2007-5760].

A local user can supply a certain type of command ('X :1 -sp <file>') specifying an arbitrary file or directory to identify whether the specified file exists in access-restricted directories based on the error message returned by the system [CVE-2007-5958].

A local user can trigger a heap corruption error in the Xinput extension [CVE-2007-6427].

A local user can read arbitrary memory contents by exploiting the ProcGetReservedColormapEntries() function in the TOG-CUP extension [CVE-2007-6428].

A local user can supply a specially crafted request to trigger an integer overflow in the pixmap creation process in the MIT-SHM and EVI extensions [CVE-2007-6429].

A local user can supply a specially crafted PCF font to trigger a buffer overflow [CVE-2008-0006].

regenrecht reported CVE-2007-5760, CVE-2007-6427, CVE-2007-6428, and CVE-2007-6429 via iDefense. Takuya Shiozaki of CodeBlog reported CVE-2008-0006. An anonymous researcher reported CVE-2007-5859.

Impact:   A local user can obtain root privileges on the target system.

A local user can determine whether files or directories exist on the target system.

Solution:   IBM has issued a fix for IBM AIX for CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, and CVE-2008-0006. AIX is not affected by CVE-2007-5760 and CVE-2007-5958.

IBM plans to issue the following APARs:

For 5.2.0: IZ13652
For 5.3.0: IZ13653
For 5.3.7: IZ13654
For 6.1.0: IZ13655

An interim fix is also available at:

ftp://aix.software.ibm.com/aix/efixes/security/X_ifix.tar

The IBM advisories are available at:

http://www.ibm.com/support/docview.wss?uid=isg1IZ13652
http://www.ibm.com/support/docview.wss?uid=isg1IZ13653
http://www.ibm.com/support/docview.wss?uid=isg1IZ13654
http://www.ibm.com/support/docview.wss?uid=isg1IZ13655

Vendor URL:  lists.freedesktop.org/archives/xorg/2008-January/031918.html (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.2, 5.3, 6.1

Message History:   This archive entry is a follow-up to the message listed below.
Jan 17 2008 X Server Bugs in XFree86, Xinput, TOG-CUP, MIT-SHM, and EVI Extensions Let Local Users Gain Root Privileges



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