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libpng denial of service vulnerability


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200405-06 / libpng
Release Date May 14, 2004
Latest Revision May 14, 2004: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
media-libs/libpng <= 1.2.5-r4 >= 1.2.5-r5 All supported architectures

Related bugreports: #49887


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

2.  Impact Information


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


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.


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.

3.  Resolution Information


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


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

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=media-libs/libpng-1.2.5-r5"
# emerge ">=media-libs/libpng-1.2.5-r5"

You should also run revdep-rebuild to rebuild any packages that depend on older versions of libpng :

Code Listing 3.2: Resolution

# revdep-rebuild

4.  References


Page updated May 14, 2004

Summary: This is a Gentoo Linux Security Advisory

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