GLSA 200711-08: libpng: Multiple Denials of Service

http://security.gentoo.org/

Severity:	normal
Title:	libpng: Multiple Denials of Service
Date:	11/07/2007
Bugs:	#195261
ID:	200711-08

Synopsis

Several vulnerabilities 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	< 1.2.21-r3	>= 1.2.21-r3	All supported architectures

Description

An off-by-one error when handling ICC profile chunks in the png_set_iCCP() function was discovered (CVE-2007-5266). George Cook and Jeff Phillips reported several errors in pngrtran.c, the use of logical instead of a bitwise functions and incorrect comparisons (CVE-2007-5268). Tavis Ormandy reported out-of-bounds read errors in several PNG chunk handling functions (CVE-2007-5269).

Impact

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

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-1.2.21-r3"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200711-08.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.