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Gentoo: XnView Stack-based buffer overflow Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo XnView is vulnerable to a stack-based buffer overflow and possible remote code execution when handling XPM image files.An attacker could entice a user to view a specially crafted XPM file with XnView that could trigger the vulnerability and possibly execute arbitrary code with the rights of the user running XnView.
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Gentoo Linux Security Advisory                           GLSA 200707-06
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: XnView: Stack-based buffer overflow
      Date: July 11, 2007
      Bugs: #175670
        ID: 200707-06

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Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D

XnView is vulnerable to a stack-based buffer overflow and possible
remote code execution when handling XPM image files.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

XnView is software to view and convert graphics files. XPixMap (XPM) is
a simple ascii-based graphics format.

Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  x11-misc/xnview       < 1.70                          Vulnerable!
    -------------------------------------------------------------------
     # Package 1 only applies to x86 users.
    -------------------------------------------------------------------
     NOTE: Certain packages are still vulnerable. Users should migrate
           to another package if one is available or wait for the
           existing packages to be marked stable by their
           architecture maintainers.

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

XnView is vulnerable to a stack-based buffer overflow while processing
an XPM file with an overly long section string (greater than 1024
bytes).

Impact
=3D=3D=3D=3D=3D=3D

An attacker could entice a user to view a specially crafted XPM file
with XnView that could trigger the vulnerability and possibly execute
arbitrary code with the rights of the user running XnView.

Workaround
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is no known workaround at this time.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

No update appears to be forthcoming from the XnView developer and
XnView is proprietary, so the XnView package has been masked in
Portage. We recommend that users select an alternate graphics viewer
and conversion utility, and unmerge XnView:

    # emerge --unmerge xnview

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

  [ 1 ] CVE-2007-2194
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2007-2194

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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

  http://security.gentoo.org/glsa/glsa-200707-06.xml

Concerns?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D=3D

Copyright 2007 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/2.5
 
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