Quoting security updates section of the upstream page: All current OptiPNG versions are known to be vulnerable to memory reallocation attacks, due to a bug in the GIF image reader. (Many thanks to Roy Tam for the report, as well as the fix.) http://optipng.sourceforge.net/ Upstream patch to be included in future upstream versions: http://prdownloads.sourceforge.net/optipng/optipng-0.6.2.1.diff?download
Created attachment 333177 [details] Local copy of the upstream patch Taken from: http://prdownloads.sourceforge.net/optipng/optipng-0.6.2.1.diff?download
optipng-0.6.2.1-1.fc10 has been submitted as an update for Fedora 10. http://admin.fedoraproject.org/updates/optipng-0.6.2.1-1.fc10
optipng-0.6.2.1-1.fc9 has been submitted as an update for Fedora 9. http://admin.fedoraproject.org/updates/optipng-0.6.2.1-1.fc9
optipng-0.6.2.1-1.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.
optipng-0.6.2.1-1.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.
CVE-2009-0749: Use-after-free vulnerability in the GIFReadNextExtension function in lib/pngxtern/gif/gifread.c in OptiPNG 0.6.2 and earlier allows context-dependent attackers to cause a denial of service (application crash) via a crafted GIF image that causes the realloc function to return a new pointer, which triggers memory corruption when the old pointer is accessed.