[gentoo-announce] [ GLSA 200804-15 ] libpng: Execution of arbitrary code

[news 28]

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Gentoo Linux Security Advisory GLSA 200804-15

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http://security.gentoo.org/

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Severity: High

Title: libpng: Execution of arbitrary code

Date: April 15, 2008

Bugs: #217047

ID: 200804-15

 

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Synopsis

========

 

A vulnerability in libpng may allow for execution of arbitrary code in

certain 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 < 1.2.26-r1 >= 1.2.26-r1

 

Description

===========

 

Tavis Ormandy of the Google Security Team discovered that libpng does

not handle zero-length unknown chunks in PNG files correctly, which

might lead to memory corruption in applications that call

png_set_read_user_chunk_fn() or png_set_keep_unknown_chunks().

 

Impact

======

 

A remote attacker could entice a user or automated system to process a

specially crafted PNG image in an application using libpng and possibly

execute arbitrary code with the privileges of the user running the

application. Note that processing of unknown chunks is disabled by

default in most PNG applications, but some such as ImageMagick are

affected.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All libpng users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.26-r1"

 

References

==========

 

[ 1 ] CVE-2008-1382

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1382

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200804-15.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 ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2008 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