GLSA 200607-06: libpng: Buffer overflow

http://security.gentoo.org/

Severity:	normal
Title:	libpng: Buffer overflow
Date:	07/19/2006
Bugs:	#138433, #138672
ID:	200607-06

Synopsis

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

Background

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

Affected packages

Package	Vulnerable	Unaffected	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

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.

Workaround

There is no known workaround at this time.

Resolution

All libpng users should upgrade to the latest version:

    # 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:


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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200607-06.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.