Check Point Advisories

Dovecot SASL Authentication Component Denial of Service (CVE-2016-8652)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0412
Date Published:	11 May 2017
Severity:	Medium
Last Updated:	Thursday 01 June, 2017
Source:	Dovecot
Industry Reference:	CVE-2016-8652
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Dovecot Dovecot 2.2.25 through 2.2.26.1
Vulnerability Description	A denial of service vulnerability exists in the SASL authentication component of Dovecot server. The vulnerability is due to improper handling of username when processing SASL authentication if auth-policy component has been activated. A remote attacker could exploit this vulnerability by sending malicious requests to target 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 Dovecot SASL Authentication Component Denial of Service 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: NNTP Protection Violation.
Attack Information: Dovecot SASL Authentication Component Denial of Service