Asterisk Endpoint Provisional Response Parsing RTP Port Consumption Remote DoS (AST-2012-010)

Medium Nessus Plugin ID 60064


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


According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a vulnerability that could allow a remote, authenticated attacker to exhaust the server of resources.

If an endpoint sends a provisional response to the server's re-INVITE message, certain data structures are not freed. More iterations of this sequence lead to exhaustion of all available RTP ports.


Upgrade to Asterisk Open Source / 10.5.2, Business Edition C.3.7.5, Certified Asterisk 1.8.11-cert4 or apply the patches listed in the Asterisk advisory.

See Also

Plugin Details

Severity: Medium

ID: 60064

File Name: asterisk_ast_2012_010.nasl

Version: $Revision: 1.9 $

Type: remote

Family: Misc.

Published: 2012/07/19

Modified: 2016/11/11

Dependencies: 63202

Risk Information

Risk Factor: Medium


Base Score: 4

Temporal Score: 3

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

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

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: asterisk/sip_detected, Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2012/07/05

Vulnerability Publication Date: 2012/07/05

Reference Information

CVE: CVE-2012-3863

BID: 54327

OSVDB: 83670