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TITLE:
Mozilla Firefox "keypress" User Interface Event Dispatching Weakness

SECUNIA ADVISORY ID:
SA32040

VERIFY ADVISORY:
http://secunia.com/advisories/32040/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Mozilla Firefox 3.x
http://secunia.com/advisories/product/19089/

DESCRIPTION:
Aditya K Sood has discovered a weakness in Mozilla Firefox, which can
be exploited by malicious people to cause a DoS (Denial of Service).

The weakness is caused due to an error when dispatching "keypress"
user interface events with e.g. the HTML root element as target. This
may potentially result in use of invalid memory or memory corruption
via a specially crafted web page.

Successful exploitation crashes the browser. However, even though
code execution has not been proven, it can't be completely ruled
out.

The weakness is confirmed in version 3.0.3 for Windows. Version 2.x
is not affected.

NOTE: Secunia normally does not classify a browser crash as a
vulnerability nor issue an advisory about it. However, the potential
impact of this issue may be more severe than currently believed.

SOLUTION:
The weakness is fixed in the pre-release nightly builds of 3.1 and
will be fixed in the upcoming version 3.0.4.

PROVIDED AND/OR DISCOVERED BY:
Reported as a NULL-pointer dereference crash by Aditya K Sood.

Additional information provided by Secunia Research.

ORIGINAL ADVISORY:
http://www.secniche.org/moz303.html

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