libpng: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200611-09 / libpng
Release Date	November 17, 2006
Latest Revision	November 17, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/libpng	< 1.2.13	>= 1.2.13	All supported architectures

Related bugreports: #154380

Synopsis

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

2. Impact Information

Background

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

Description

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that a vulnerability exists in the sPLT chunk handling code of libpng, a large sPLT chunk may cause an application to attempt to read out of bounds.

Impact

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

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-1.2.13"

4. References

CVE-2006-5793

Updated November 17, 2006

Summary: This is a Gentoo Linux Security Advisory

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