Check Point Advisories

Preemptive Protection against SSL and TLS Protocols Information Disclosure (MS12-006; CVE-2011-3389)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-020
Date Published:	10 Jan 2012
Severity:	High
Last Updated:	Monday 25 November, 2024
Source:	CVE-2011-3389
Protection Provided by:	Security Gateway R70 R71 R75
Who is Vulnerable?	Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Windows Vista Service Pack 2 Windows Vista x64 Edition Service Pack 2 Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for Itanium-based Systems Service Pack 2 Windows 7 for 32-bit Systems Windows 7 for 32-bit Systems Service Pack 1 Windows 7 for x64-based Systems Windows 7 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for Itanium-based Systems Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Vulnerability Description	An information disclosure vulnerability has been reported in SSL 3.0 and TLS 1.0 encryption protocols.
Vulnerability Details	The vulnerability is caused due to a design flaw in the SSL and TLS protocols when Cipher-block chaining (CBC) mode of operation is used. The vulnerability affects the protocol itself and is not specific to the Windows operating system. Remote attackers may exploit this issue by rapidly sending a large number of SSL and TLS requests to the server. Successful exploitation could allow an attacker to decrypt portions of encrypted web traffic, resulting in the disclosure of sensitive information.

Protection Overview

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

No update is required to address this vulnerability

Users are protected against this vulnerability if the Web Servers SSL Flooding Denial of Service protection found in the Protection section of CPAI-2011-505 has been applied.

Security Gateway R75 / R71 / R70

In the IPS tab, click Protections, find the Web Servers SSL Flooding Denial of Service protection using the Search tool and double-click on the protection.
In the Protection Details window, select the required profile and then click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
Configure the protection to your requirements.
Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: Web Server Enforcement Violation
Attack Information: Web servers SSL flooding denial of service