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.
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.