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

medium Nessus Plugin ID 90799

Language:

Synopsis

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

Description

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.

Solution

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

Plugin Details

Severity: Medium

ID: 90799

File Name: asterisk_ast_2016_004.nasl

Version: 1.7

Type: remote

Family: Misc.

Published: 4/29/2016

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information

CVSS v2

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: Settings/ParanoidReport, asterisk/sip_detected

Patch Publication Date: 4/14/2016

Vulnerability Publication Date: 4/14/2016

Detections

Analytics