Libpng stalls and consumes large quantities of memory while processing certain Portable Network Graphics (PNG) files.
When processing PNG files containing highly compressed ancillary chunks, the png_decompress_chunk() function in libpng can consume large amounts of CPU time and memory. This resource consumption may hang applications that use libpng. More information is available in the PNG Development Group security advisory and supplementary document, Defending Libpng Applications Against Decompression Bombs.
This vulnerability could allow an unauthenticated, remote attacker to cause a denial of service.
The PNG Development Group has released versions 1.4.1, 1.2.43, and 1.0.53, which provide more efficient decompression of ancillary chunks. This update decreases resource consumption associated with chunk decompression, but may not provide a complete defense unless coupled with appropriate memory limits.
This issue was reported by the PNG Development Group.
This document was written by David Warren.
|Date First Published:||2010-03-02|
|Date Last Updated:||2010-03-02 14:58 UTC|