libpng: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200607-06 / libpng
Release Date	July 19, 2006
Latest Revision	July 19, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/libpng	< 1.2.12	>= 1.2.12	All supported architectures
app-emulation/emul-linux-x86-baselibs	< 2.5.1	>= 2.5.1	AMD64

Related bugreports: #138433, #138672

Synopsis

A buffer overflow has been found in the libpng library that could lead to the execution of arbitrary code.

2. Impact Information

Background

libpng is an open, extensible image format library, with lossless compression.

Description

In pngrutil.c, the function png_decompress_chunk() allocates insufficient space for an error message, potentially overwriting stack data, leading to a buffer overflow.

Impact

By enticing a user to load a maliciously crafted PNG image, an attacker could execute arbitrary code with the rights of the user, or crash the application using the libpng library, such as the emul-linux-x86-baselibs.

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-1.2.12"

All AMD64 emul-linux-x86-baselibs users should also upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-emulation/emul-linux-x86-baselibs-2.5.1"

4. References

Page updated July 19, 2006

Summary: This is a Gentoo Linux Security Advisory

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