libpng denial of service vulnerability

ID GLSA-200405-06
Type gentoo
Reporter Gentoo Foundation
Modified 2004-05-14T00:00:00



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.


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:

 # 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 :

 # revdep-rebuild