Tavis Ormandy told vendor-sec about a OOB memory read flaw in libpng. This flaw is a denial of service flaw. quoting the mail from Tavis: Hello, there's a typo in the sPLT chunk handling code in libpng, potentially resulting in an OOB read. AFAICT, the extent of the vulnerability is denial of service, but would appreciate a second pair of eyes to verify. Around line ~983 of pngset.c, in png_set_sPLT() to->entries =3D (png_sPLT_entryp)png_malloc(png_ptr,=20 from->nentries * png_sizeof(png_sPLT_t)); should be `png_sizeof(png_sPLT_entry)` and the same on this line: png_memcpy(to->entries, from->entries, from->nentries * png_sizeof(png_sPLT_t)); This issue also affects RHEL2.1 and RHEL3
This issue is now public: http://bugs.gentoo.org/show_bug.cgi?id=154380
Normally i am quite pleased with the speed of security updates by redhat. But sometimes vulnerabilities seems to be overseen. Please release a fix for this issue. See also "Bugzilla Bug 216706: CVE-2006-5793 libpng, libpng10 DoS".
We have assigned this flaw a severity of "low". We will not release an update to libpng only to fix this flaw given the very low severity. This flaw will be fixed in our next libpng update.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2007-0356.html