Check Point Advisories

Digium Asterisk pjsip_multipart_parse Denial of Service

Check Point Reference: CPAI-2017-0515
Date Published: 19 Jun 2017
Severity: Medium
Last Updated: Monday 19 June, 2017
Source: Digium AST-2017-003
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Teluu Ltd. PJPROJECT prior to commit 595cac8
Vulnerability Description A denial of service vulnerability exists in Digium Asterisk. The vulnerability is due to a processing flaw in the pjsip_multipart_parse function of sip_multipart.c when the chan_pjsip module is used. A remote, unauthenticated attacker could exploit this vulnerability by sending a maliciously crafted SIP request containing multipart data to a vulnerable Asterisk server.

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 pjsip_multipart_parse Denial of Service 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:  VoIP Enforcement Violation.
Attack Information:  Digium Asterisk pjsip_multipart_parse Denial of Service

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