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The Secunia Software Inspector is a free service that detects insecure
versions of software that you may have installed in your system. When
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TITLE:
Fritz!Box UDP Packet SIP Denial of Service

SECUNIA ADVISORY ID:
SA23868

VERIFY ADVISORY:
http://secunia.com/advisories/23868/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
AVM Fritz!Box 7050
http://secunia.com/product/13298/

DESCRIPTION:
Matthias Wenzel has reported a vulnerability in AVM Fritz!Box 7050,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error within the handling of
certain UDP packets. This can be exploited to crash the VoIP
application by sending a UDP packet with size 0 to the SIP Port
(5060/UDP).

SOLUTION:
Use another device.

PROVIDED AND/OR DISCOVERED BY:
Matthias Wenzel

ORIGINAL ADVISORY:
http://mazzoo.de/blog/2007/01/18#FritzBox_DoS

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