Staying Safe in Times of Cyber Uncertainty
Check Point Advisories

Web Servers SSL Flooding Denial of Service (CVE-2011-3389)

Check Point Reference: CPAI-2011-505
Date Published: 6 Nov 2011
Severity: N/A
Last Updated: Thursday 27 September, 2018
Industry Reference:CVE-2011-3389
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70

Who is Vulnerable?
Vulnerability Description The vulnerability is due to the server's inability to handle multiple incoming SSL requests within a short period of time. Remote attackers may exploit this issue by rapidly sending a large number of SSL requests to the server. The attack may be initiated from one or more sources (DDoS). Successful exploitation may cause the server to crash, resulting in a denial of service condition. 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 SSL 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 SSL Flooding 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 SSL Flooding Denial of Service

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