Asterisk REGISTER Request Contact URI Handling DoS (AST-2016-004)

Medium Nessus Plugin ID 90799


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 is either 13.x prior to 13.8.1 or 13.1-cert prior to 13.1-cert5. It is, therefore, affected by a flaw when processing incoming REGISTER requests if the REGISTER contains an overlong URI in the Contact header. An authenticated, remote attacker can exploit this to cause a denial of service condition.

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 version 13.8.1 / 13.1-cert5, or apply the appropriate patch according to the Asterisk advisory.

See Also

Plugin Details

Severity: Medium

ID: 90799

File Name: asterisk_ast_2016_004.nasl

Version: $Revision: 1.4 $

Type: remote

Family: Misc.

Published: 2016/04/29

Modified: 2017/02/16

Dependencies: 63202

Risk Information

Risk Factor: Medium


Base Score: 6.8

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

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: asterisk/sip_detected, Settings/ParanoidReport

Patch Publication Date: 2016/04/14

Vulnerability Publication Date: 2016/04/14

Reference Information

OSVDB: 137214