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.
affect Thunderbird via received mail, but without scripting to prepare
memory it may not be possible to exploit this condition in mail.
Upgrade to the fixed version.
This issue also affects FC4
This bug was fixed for FC4 in Fedora Update FEDORA-2006-488
This bug was fixed for FC5 in Fedora Update FEDORA-2006-487