[NEWS] Gecko legend object DoS

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Gecko legend object DoS


Gecko does not handle properly the HTML tags of headers inside legend,
allowing attackers to crash Gecko based browsers.


Vulnerable Systems:
* Mozilla Firefox and prior
* Mozilla Suite 1.0.7 and prior

Immune Systems:
* Mozilla Firefox
* Mozilla Suite 1.0.8

A Null Pointer Dereference exists with the way Gecko handles the <legened>

Proof of Concept:
< legend>
< kbd>
< object>
< h4>
< / object>
< / kbd>

The vulnerability exists with the use of header tag (<h4> on the above

Vendor Status:
The vendor has issued a fix with the new Mozilla based products.

Disclosure Timeline:
01 Oct 05 - DoS vulnerability discovered.
15 Dec 05 - Vendor contacted.
15 Dec 05 - Vendor confirmed vulnerability.
02 Feb 06 - Fixed on 1.x branches.
12 Apr 06 - Public release.


The information has been provided by <mailto:bugtraq@xxxxxxxxxxxx> Thomas
The original article can be found at:


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