Check Point Advisories

Digium Asterisk res_http_websocket Denial of Service (CVE-2018-17281)

Check Point Reference: CPAI-2018-1304
Date Published: 8 Mar 2020
Severity: High
Last Updated: Sunday 08 March, 2020
Source:
Industry Reference:CVE-2018-17281
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Digium Asterisk Open Source prior to 13.23.1
Digium Asterisk Open Source prior to 14.7.8
Digium Asterisk Open Source prior to 15.6.1
Digium Certified Asterisk prior to 13.21-cert3
Vulnerability Description A denial of service vulnerability exists in Digium Asterisk res_http_websocket. The vulnerability may occur when sending an HTTP Upgrade Request. Successful exploitation of this vulnerability could allow a remote attacker to cause denial of service conditions on the target system.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Digium Asterisk res_http_websocket Denial of Service (CVE-2018-17281) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Server Enforcement Violation.
Attack Information:  Digium Asterisk res_http_websocket Denial of Service (CVE-2018-17281)

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