GLSA 201701-74: libpng: Remote execution of arbitrary code

http://security.gentoo.org/

Severity:	normal
Title:	libpng: Remote execution of arbitrary code
Date:	01/29/2017
Bugs:	#604082
ID:	201701-74

Synopsis

A null pointer dereference in libpng might allow remote attackers to execute 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	< 1.6.27	>= 1.6.27	All supported architectures

Description

A null pointer dereference was discovered in libpng in the png_push_save_buffer function. In order to be vulnerable, an application has to load a text chunk into the PNG structure, then delete all text, then add another text chunk to the same PNG structure, which seems to be an unlikely sequence, but it is possible.

Impact

A remote attacker, by enticing a user to process a specially crafted PNG file, could execute arbitrary code with the privileges of the process.

Workaround

There is no known workaround at this time.

Resolution

All libpng 1.6.x users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.27"

All libpng 1.5.x users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.28:1.5"

All libpng 1.2.x users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.57:1.2"

References

CVE-2016-10087

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201701-74.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.