Asterisk PJSIP Multiple Vulnerabilities (AST-2014-013 / AST-2014-015 / AST-2014-016)

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


Synopsis :

A telephony application running on the remote host is affected by
multiple vulnerabilities.

Description :

According to the version in its SIP banner, the version of Asterisk
running on the remote host is potentially affected by the following
vulnerabilities in the PJSIP channel driver :

- A security bypass vulnerability exists due to a flaw in
the 'res_pjsip_acl' module which may allow a remote
attacker to bypass ACL rules for rejecting SIP requests
from certain hosts. (CVE-2014-8413)

- A denial of service vulnerability exists due to a race
condition in the 'chan_pjsip' channel driver which could
allow a remote attacker to crash the application.
(CVE-2014-8415)

- A denial of service vulnerability exists due to a flaw
in the 'res_pjsip_refer' module that is triggered when
handling an INVITE with 'Replaces' message that has
been sent after a session has already been established.
By using a specially crafted request, a remote attacker
could exploit this to crash the application.
(CVE-2014-8416)

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-2014-013.html
https://issues.asterisk.org/jira/browse/ASTERISK-24531
http://downloads.asterisk.org/pub/security/AST-2014-015.html
http://downloads.asterisk.org/pub/security/AST-2014-016.html
https://issues.asterisk.org/jira/browse/ASTERISK-24471

Solution :

Upgrade to Asterisk 12.7.1 / 13.0.1 or apply the appropriate patch or
workaround listed in the Asterisk advisories.

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: 79439 ()

Bugtraq ID: 71221
71224
71225

CVE ID: CVE-2014-8413
CVE-2014-8415
CVE-2014-8416

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