[NEWS] Gecko legend object DoS

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  Gecko legend object DoS
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SUMMARY

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

DETAILS

Vulnerable Systems:
 * Mozilla Firefox 1.5.0.1 and prior
 * Mozilla Suite 1.0.7 and prior

Immune Systems:
 * Mozilla Firefox 1.5.0.2
 * Mozilla Suite 1.0.8

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

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

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

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.


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> Thomas 
Waldegger.
The original article can be found at:  
<http://morph3us.org/advisories/20060412-firefox-1501.txt> 
http://morph3us.org/advisories/20060412-firefox-1501.txt



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