CSS Letter-Spacing Heap Overflow Vulnerability An anonymous researcher for TippingPoint and the Zero Day Initiative discovered an integer overflow triggered by the CSS letter-spacing property. This results in in under-allocating memory and ultimately a heap buffer overflow which could be exploited to run code of the attacker's choice. The overflow condition itself does not require JavaScript and thus could affect Thunderbird via received mail, but without scripting to prepare memory it may not be possible to exploit this condition in mail. Workaround Upgrade to the fixed version. References [1]ZDI-06-009 [2]https://bugzilla.mozilla.org/show_bug.cgi?id=325403 This issue also affects FC4
Lifting embargo
This bug was fixed for FC4 in Fedora Update FEDORA-2006-488 <http://www.redhat.com/archives/fedora-package-announce/2006-May/msg00019.html>. This bug was fixed for FC5 in Fedora Update FEDORA-2006-487 <http://www.redhat.com/archives/fedora-package-announce/2006-May/msg00018.html>.