libpng denial of service vulnerability
Gentoo Linux Security Advisory
||GLSA 200405-06 / libpng
||May 14, 2004
||May 14, 2004: 01
All supported architectures
A bug in the libpng library can be abused to crash programs making use of
that library to decode PNG images.
libpng is a standard library used to process PNG (Portable Network
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
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