Asterisk 13.10.x < 13.11.1 ACK Handling Unrecognized Username NULL Pointer Dereference DoS (AST-2016-006)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

A telephony application running on the remote host is affected by a
denial of service vulnerability.

Description :

According to its SIP banner, the version of Asterisk running on the
remote host is 13.10.x prior to 13.11.1. It is, therefore, affected by
a NULL pointer dereference flaw due to improper handling of ACK
packets from an unknown username. An unauthenticated, remote attacker
can exploit this to crash the program, resulting in a denial of
service. This vulnerability only affects installations using the PJSIP
stack; installations using chan_sip are unaffected.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.

See also :

http://downloads.asterisk.org/pub/security/AST-2016-006.html
http://seclists.org/fulldisclosure/2016/Sep/15

Solution :

Upgrade to Asterisk version 13.11.1.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 93533 ()

Bugtraq ID: 92886

CVE ID:

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