Asterisk 13.10.x < 13.11.1 ACK Handling Unrecognized Username NULL Pointer Dereference DoS (AST-2016-006)

high Nessus Plugin ID 93533

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 13.10.x prior to 13.11.1. It is, therefore, affected by a NULL pointer dereference flaw due to improper handling of ACK packets from an unknown username. An unauthenticated, remote attacker can exploit this to crash the program, resulting in a denial of service. This vulnerability only affects installations using the PJSIP stack; installations using chan_sip are unaffected.

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 13.11.1.

Plugin Details

Severity: High

ID: 93533

File Name: asterisk_ast_2016_006.nasl

Version: 1.10

Type: remote

Family: Misc.

Published: 9/15/2016

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information

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 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

Patch Publication Date: 9/8/2016

Vulnerability Publication Date: 9/8/2016

Reference Information

BID: 92886

Detections

Analytics