Check Point Advisories

Digium Asterisk CDR ast_cdr_setuserfield Buffer Overflow (CVE-2017-16671; CVE-2017-7617)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0367
Date Published:	3 May 2017
Severity:	Medium
Last Updated:	Thursday 04 January, 2018
Source:	Digium AST-2017-001
Industry Reference:	CVE-2017-16671 CVE-2017-7617
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Digium Asterisk Open Source 13.x prior to 13.14.1 Digium Asterisk Open Source 14.x prior to 14.3.1 Digium Certified Asterisk 13.13 prior to 13.13-cert3
Vulnerability Description	A buffer overflow exists in the CDR engine of Digium Asterisk. The vulnerability is due to a lack of size checking when setting the user field of a CDR. A remote, authenticated attacker can exploit this vulnerability by sending a crafted message to an affected 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

In the IPS tab, click Protections and find the Digium Asterisk CDR ast_cdr_setuserfield Buffer Overflow protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: VoIP Enforcement Violation.
Attack Information: Digium Asterisk CDR ast_cdr_setuserfield Buffer Overflow