GLSA 200705-24: libpng: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	libpng: Denial of Service
Date:	05/31/2007
Bugs:	#178004
ID:	200705-24

Synopsis

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

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
media-libs/libpng	< 1.2.17	>= 1.2.17	All supported architectures

Description

Mats Palmgren fixed an error in file pngrutil.c in which the trans[] array might be not allocated because of images with a bad tRNS chunk CRC value.

Impact

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

Workaround

There is no known workaround at this time.

Resolution

Please note that due to separate bugs in libpng 1.2.17, Gentoo does not provide libpng-1.2.17 but libpng-1.2.18. All libpng users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.18"

References

CVE-2007-2445

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200705-24.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.