Asterisk Invalid INVITE / REGISTER SIP Request Username Enumeration (AST-2011-011)

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 an information disclosure vulnerability.

Description :

According to the version in its SIP banner, the version of Asterisk
running on the remote host allows a remote attacker to enumerate valid
users by sending malformed SIP INVITE and REGISTER requests.

See also :

http://downloads.asterisk.org/pub/security/AST-2011-011.html

Solution :

Update to Asterisk 1.4.41.2 / 1.6.2.18.2 / 1.8.4.4 / C.3.7.3 or
later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 4.8
(CVSS2#E:F/RL:U/RC:ND)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 56921 ()

Bugtraq ID: 47676
48008
48485

CVE ID: CVE-2011-2536
CVE-2011-2666