giflib: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200511-03 / giflib
Release Date	November 04, 2005
Latest Revision	November 04, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/giflib	< 4.1.4	>= 4.1.4	All supported architectures

Related bugreports: #109997

Synopsis

giflib may dereference NULL or write out of bounds when processing malformed images, potentially resulting in Denial of Service or arbitrary code execution.

2. Impact Information

Background

giflib is a library for reading and writing GIF images.

Description

Chris Evans and Daniel Eisenbud independently discovered two out-of-bounds memory write operations and a NULL pointer dereference in giflib.

Impact

An attacker could craft a malicious GIF image and entice users to load it using an application making use of the giflib library, resulting in an application crash or potentially the execution of arbitrary code.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All giflib users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/giflib-4.1.4"

4. References

Page updated November 04, 2005

Summary: This is a Gentoo Linux Security Advisory

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