libpng: Information disclosure

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200906-01 / libpng
Release Date	June 27, 2009
Latest Revision	June 27, 2009: 01
Impact	low
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/libpng	< 1.2.37	>= 1.2.37	All supported architectures

Related bugreports: #272970

Synopsis

A vulnerability has been discovered in libpng that allows for information disclosure.

2. Impact Information

Background

libpng is the official PNG reference library used to read, write and manipulate PNG images.

Description

Jeff Phillips discovered that libpng does not properly parse 1-bit interlaced images with width values that are not divisible by 8, which causes libpng to include uninitialized bits in certain rows of a PNG file.

Impact

A remote attacker might entice a user to open a specially crafted PNG file, possibly resulting in the disclosure of sensitive memory portions.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All libpng users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.37"

4. References

CVE-2009-2042

Page updated June 27, 2009

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.