Asterisk SIP Channel Driver Denial of Service (AST-2011-007)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The version of Asterisk installed on the remote host may be affected
by a denial of service vulnerability.

Description :

According to the version in its SIP banner, the version of Asterisk
running on the remote host is 1.8.x prior to 1.8.4.2. It, therefore,
could be affected by a denial of service vulnerability.

If a remote attacker initiates a SIP call and the recipient picks up,
the remote user can reply with a malformed Contact header that will
cause Asterisk to crash.

See also :

http://downloads.asterisk.org/pub/security/AST-2011-007.html
http://archives.neohapsis.com/archives/bugtraq/2011-06/0028.html

Solution :

Upgrade to Asterisk 1.8.4.2 or later.

Risk factor :

Low / CVSS Base Score : 3.5
(CVSS2#AV:N/AC:M/Au:S/C:N/I:N/A:P)
CVSS Temporal Score : 2.6
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Denial of Service

Nessus Plugin ID: 54971 ()

Bugtraq ID: 48096

CVE ID: CVE-2011-2216