Asterisk 'res_http_websocket' Double-Free DoS (AST-2014-019)

This script is Copyright (C) 2014-2016 Tenable Network Security, Inc.


Synopsis :

A telephony application running on the remote host is 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 potentially affected by a double-free
error related to the 'res_http_websocket' module and handling of
zero-length payloads that could allow denial of service attacks.

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

See also :

http://downloads.asterisk.org/pub/security/AST-2014-019.html
https://issues.asterisk.org/jira/browse/ASTERISK-24472

Solution :

Upgrade to Asterisk 11.14.2 / 12.7.2 / 13.0.2 / 11.6-cert9 or apply
the appropriate patch listed in the Asterisk advisory.

Alternatively, as a workaround, disable the built-in HTTP server.

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.7
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 80036 ()

Bugtraq ID: 71607

CVE ID: CVE-2014-9374

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