GLSA 201502-10: libpng: User-assisted execution of arbitrary code

http://security.gentoo.org/

Severity:	normal
Title:	libpng: User-assisted execution of arbitrary code
Date:	02/15/2015
Bugs:	#531264, #533358
ID:	201502-10

Synopsis

Two vulnerabilities have been found in libpng, possibly resulting in execution of arbitrary code.

Background

libpng is a standard library used to process PNG (Portable Network Graphics) images. It is used by several programs, including web browsers and potentially server processes.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
media-libs/libpng	< 1.6.16	>= 1.6.16	All supported architectures

Description

Two vulnerabilities have been discovered in libpng:

The png_user_version_check function contains an out-of-bounds memory access error (libpng 1.6.15 Release Notes)
The png_combine_row function contains an integer overflow error, which could result in a heap-based buffer overflow (CVE-2014-9495)

Impact

A context-dependent attacker could entice a user to open a specially crafted PNG file using an application linked against libpng, possibly resulting in execution of arbitrary code.

Workaround

There is no known workaround at this time.

Resolution

All libpng 1.6 users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.16"

All libpng 1.5 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.21"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201502-10.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 https://bugs.gentoo.org.