libpng: Execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200804-15 / libpng
Release Date	April 15, 2008
Latest Revision	April 15, 2008: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/libpng	< 1.2.26-r1	>= 1.2.26-r1	All supported architectures

Related bugreports: #217047

Synopsis

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

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-1.2.26-r1"

4. References

CVE-2008-1382

Updated April 15, 2008

Summary: This is a Gentoo Linux Security Advisory

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