Asterisk Opus Codec DoS (AST-2016-008)

high Nessus Plugin ID 95926

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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 13.12.x prior to 13.13.1 or 14.x prior to 14.2.1. It is, therefore, affected by a denial of service vulnerability in the Opus codec when handling SDP offer or answer requests due to improper parsing of format parameters when they are separated by space characters. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to cause the parser to recursively call itself until it crashes.

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 13.13.1 / 14.2.1 or later.

Plugin Details

Severity: High

ID: 95926

File Name: asterisk_ast_2016_008.nasl

Version: 1.9

Type: remote

Family: Misc.

Published: 12/19/2016

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-9937

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: Settings/ParanoidReport, asterisk/sip_detected

Exploit Ease: No known exploits are available

Patch Publication Date: 12/8/2016

Vulnerability Publication Date: 12/8/2016

Reference Information

CVE: CVE-2016-9937

BID: 94792

Detections

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