Asterisk chan_pjsip Incompatible Codecs DoS (AST-2015-001)

Medium Nessus Plugin ID 81205


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


According to its SIP banner, the version of Asterisk running on the remote host has a flaw in which it fails to reclaim allocated RTP ports whenever a connection is made to an authenticated endpoint whose SPD offers only codecs that are not allowed by Asterisk. An attacker could exploit this vulnerability to cause an exhaustion of available ports, leading to a denial of service. Note that this only affects Asterisk using the PJSIP channel driver.

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


Upgrade to Asterisk 12.8.1 / 13.1.1 or apply the appropriate patch listed in the Asterisk advisory.

See Also

Plugin Details

Severity: Medium

ID: 81205

File Name: asterisk_ast_2015_001.nasl

Version: $Revision: 1.8 $

Type: remote

Family: Misc.

Published: 2015/02/06

Modified: 2016/11/11

Dependencies: 63202

Risk Information

Risk Factor: Medium


Base Score: 4

Temporal Score: 3.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: asterisk/sip_detected, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2015/01/28

Vulnerability Publication Date: 2015/01/09

Reference Information

BID: 72380

OSVDB: 117719