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Check Point Advisories

Web servers multiple IMAP initial connection requests denial of service

Check Point Reference: CPAI-2012-103
Date Published: 19 Mar 2012
Severity: N/A
Last Updated: 2 Mar 2016
Protection Provided by:

Security Gateway
R80, R77, R75, R71, R70

Who is Vulnerable?
Vulnerability Description A denial of service vulnerability has been reported in all web servers. The vulnerability is due to the server's inability to handle multiple incoming IMAP requests within a short period of time. Remote attackers may exploit this issue by rapidly sending a large number of IMAP requests to the server. There are cases in which certain traffic, although not intended for malicious use, is very unsafe, since it may transfer shellcode which is undetectable by IPS.

Protection Overview

IPS will detect and block IMAP requests sent to the server over a short period of time.

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 / R71 / R70

  1. In the IPS tab, click Protections and find the Web servers multiple IMAP initial connection requests 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:  Web Server Enforcement Violation.
Attack Information:  Web Servers Multiple IMAP Initial Connection Requests Denial of Service

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