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Category:   Application (Generic)  >   X Vendors:   X.org
(Gentoo Issues Fix for X) XFree86 pixmap Integer Overflows May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1014890
SecurityTracker URL:  http://securitytracker.com/id/1014890
CVE Reference:   CVE-2005-2495   (Links to External Site)
Date:  Sep 13 2005
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in XFree86. A local user may be able to gain elevated privileges. X is affected.

The software does not properly parse pixmap images. A local user can create a specially crafted pixmap image that, when loaded by the target user, will execute arbitrary code with elevate privileges.

The original bug report is available at:

https://bugs.freedesktop.org/show_bug.cgi?id=594

Luke Hutchison reported this vulnerability.

Impact:   A local user may be able to execute arbitrary code with elevated privileges.
Solution:   Gentoo has issued a fix and recommends that all X.org users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-x11-6.8.2-r3"

Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Sep 13 2005 XFree86 pixmap Integer Overflows May Let Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [Full-disclosure] [ GLSA 200509-07 ] X.Org: Heap overflow in pixmap


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Gentoo Linux Security Advisory                           GLSA 200509-07
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                                            http://security.gentoo.org/
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  Severity: High
     Title: X.Org: Heap overflow in pixmap allocation
      Date: September 12, 2005
      Bugs: #105688
        ID: 200509-07

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Synopsis
========

An integer overflow in pixmap memory allocation potentially allows any
X.Org user to execute arbitrary code with elevated privileges.

Background
==========

X.Org is X.Org Foundation's Public Implementation of the X Window
System.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  x11-base/xorg-x11     < 6.8.2-r3                      >= 6.8.2-r3

Description
===========

X.Org is missing an integer overflow check during pixmap memory
allocation.

Impact
======

An X.Org user could exploit this issue to make the X server execute
arbitrary code with elevated privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All X.org users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-x11-6.8.2-r3"

References
==========

  [ 1 ] CAN-2005-2495
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2495

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200509-07.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0


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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/
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