[ GLSA 200405-06 ] libpng denial of service vulnerability

[GLSA]

Gentoo Linux Security Advisory

Title: libpng denial of service vulnerability (GLSA 200405-06)
Severity: normal
Exploitable: remote
Date: May 14, 2004
Bug(s): #49887
ID: 200405-06

Synopsis


A bug in the libpng library can be abused to crash programs making use of
that library to decode PNG images.


Background


libpng is a standard library used to process PNG (Portable Network
Graphics) images.


Affected Packages

Package: media-libs/libpng
Vulnerable: <= 1.2.5-r4
Unaffected: >= 1.2.5-r5
Architectures: All supported architectures


Description


libpng provides two functions (png_chunk_error and png_chunk_warning) for
default error and warning messages handling. These functions do not perform
proper bounds checking on the provided message, which is limited to 64
bytes. Programs linked against this library may crash when handling a
malicious PNG image.


Impact


This vulnerability could be used to crash various programs using the libpng
library, potentially resulting in a denial of service attack on vulnerable
daemon processes.


Workaround


There is no known workaround at this time. All users are advised to upgrade
to the latest available version of libpng.


Resolution


All users of libpng should upgrade to the latest stable version: