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=========================================================== Ubuntu Security Notice USN-156-1 July 29, 2005 tiff vulnerability https://bugzilla.ubuntu.com/show_bug.cgi?id=12008 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog) The following packages are affected: libtiff4 The problem can be corrected by upgrading the affected package to version 3.6.1-1.1ubuntu1.4 (for Ubuntu 4.10), or 3.6.1-5ubuntu0.2 (for Ubuntu 5.04). After a standard system upgrade you need to restart your CUPS server with sudo /etc/init.d/cupsys restart to effect the necessary changes. Details follow: Wouter Hanegraaff discovered that the TIFF library did not sufficiently validate the "YCbCr subsampling" value in TIFF image headers. Decoding a malicious image with a zero value resulted in an arithmetic exception, which caused the program that uses the TIFF library to crash. This leads to a Denial of Service in server applications that use libtiff (like the CUPS printing system) and can cause data loss in, for example, the Evolution email client.