Update Protection against Microsoft WINS Service Failed Response Memory Corruption Vulnerability (MS11-035; CVE-2011-1248)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-246
Date Published:
Severity:
Source:	Microsoft Security Bulletin MS11-035
Industry Reference(s):	CVE-2011-1248
Protection Provided by:	Security Gateway R75 R71 R70 VPN-1 NGX R65 VSX NGX R65
Who is Vulnerable? Windows Server 2003 SP2 Windows Server 2003 x64 Edition SP2 Windows Server 2003 with SP2 (Itanium) Windows Server 2008 for 32-bit Systems Windows Server 2008 for 32-bit Systems SP2 Windows Server 2008 for x64-based Systems Windows Server 2008 for x64-based Systems SP2 Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for x64-based Systems SP1
Vulnerability Description A remote code execution vulnerability has been discovered in Microsoft WINS. Windows Internet Naming Service (WINS) was designed specifically to support NetBIOS over TCP/IP (NetBT), and is required for any environment in which users access resources that have NetBIOS names. A remote attacker can exploit this vulnerability to take complete control over an affected system.

Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS11-035

Vulnerability Details
The vulnerability is due to a logic error when WINS handles a socket send exception - certain user-supplied values remain within a stack frame and are re-used in another context. A remote attacker can trigger this issue by sending a specially crafted packet to an affected WINS system. Successful exploitation of the vulnerability may allow the attacker to execute arbitrary code on the vulnerable system.

Protection Overview
This protection will detect and block the transferring of malformed WINS packets.

In order for the protection to be activated, update your Security Gateway/VPN-1 product to the latest IPS/SmartDefense update. For information on how to update IPS/SmartDefense, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway: R75

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > IPS Software Blade > Application Intelligence > Microsoft Networks.
2. In the right pane, double-click the Microsoft WINS Service Failed Response Memory Corruption (MS11-035) protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Microsoft WINS Protection Violation
Attack Information: Microsoft WINS service failed response memory corruption (MS11-035)

Security Gateway: R70/R71

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Application Intelligence > Microsoft Networks.
2. In the right pane, double-click the Microsoft WINS Service Failed Response Memory Corruption (MS11-035) protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

VPN-1 NGX R65 & VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks > Microsoft WINS Service Failed Response Memory Corruption (MS11-035).
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

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