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Gentoo Linux Security Advisory                           GLSA 200705-24
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: libpng: Denial of Service
      Date: May 31, 2007
      Bugs: #178004
        ID: 200705-24

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Synopsis
=======
A vulnerability in libpng may allow a remote attacker to crash
applications that handle untrusted images.

Background
=========
libpng is a free ANSI C library used to process and manipulate PNG
images.

Affected packages
================
    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-libs/libpng      < 1.2.17                         >= 1.2.17

Description
==========
Mats Palmgren fixed an error in file pngrutil.c in which the trans[]
array might be not allocated because of images with a bad tRNS chunk
CRC value.

Impact
=====
A remote attacker could craft an image that when processed or viewed by
an application using libpng causes the application to terminate
abnormally.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
Please note that due to separate bugs in libpng 1.2.17, Gentoo does not
provide libpng-1.2.17 but libpng-1.2.18. All libpng users should
upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.18"

References
=========
  [ 1 ] CVE-2007-2445
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2445

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

  https://security.gentoo.org/glsa/200705-24

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
https://bugs.gentoo.org/.

License
======
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.

https://creativecommons.org/licenses/by-sa/2.5/