Asterisk 13.x < 13.23.1 / 14.x < 14.7.8 / 15.x < 15.6.1 / 13.21 < 13.21-cert3 HTTP Websocket Stack Overflow (AST-2018-009)

high Nessus Plugin ID 117808

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Synopsis

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

Description

According to its SIP banner, the version of Asterisk running on the remote host is 13.x prior to 13.23.1, 14.x prior to 14.7.8, 15.x prior to 15.6.1, or 13.21 prior to 13.21-cert3. It is therefore, affected by an error related to the res_http_websocket.so module that allows a stack overflow error as described in AST-2018-009. This error can allow denial of service attacks.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Asterisk version 13.23.1 / 14.7.8 / 15.6.1 / 13.21-cert3 or later.

Alternatively, do not load the res_http_websocket.so module, thus disabling HTTP websocket access.

Plugin Details

Severity: High

ID: 117808

File Name: asterisk_ast_2018_009.nasl

Version: 1.5

Type: remote

Family: Misc.

Published: 9/27/2018

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-2018-17281

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: 9/20/2018

Vulnerability Publication Date: 9/20/2018

Reference Information

CVE: CVE-2018-17281

Detections

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