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TITLE:
Asterisk SIP INVITE Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA24564

VERIFY ADVISORY:
http://secunia.com/advisories/24564/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/

DESCRIPTION:
A vulnerability has been reported in Asterisk, 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 SIP INVITE messages. This can be exploited to crash the
server by sending a SIP INVITE message with 2 SDP headers, where the
second header contains an invalid IP address.

Successful exploitation requires that the callee is an invalid
dailplan or user.

The vulnerability is reported in versions 1.2.14, 1.2.15, 1.2.16, and
1.4.1. Prior versions may also be affected.

SOLUTION:
Reportedly fixed in versions 1.4.2 and 1.2.17.

PROVIDED AND/OR DISCOVERED BY:
Humberto J. Abdelnur, Radu State, and Olivier Festor

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/053052.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
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