Update Protection against Microsoft SMB Client Crafted Response Parsing Code Execution Vulnerability (MS11-019)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-230
Date Published:
Severity:
Source:	Microsoft Security Bulletin MS11-019
Industry Reference(s):	CVE-2011-0660
Protection Provided by:	Security Gateway R75 R71 R70 VPN-1 NGX R65 VSX NGX R65 IPS-1 IPS-1 IPS-1 NGX R65
Who is Vulnerable? Windows XP SP3 Windows XP Professional x64 Edition SP2 Windows Server 2003 SP2 Windows Server 2003 x64 Edition SP2 Windows Server 2003 with SP2 (Itanium) Windows Vista SP1 Windows Vista SP2 Windows Vista x64 Edition SP1 Windows Vista x64 Edition SP2 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 (Itanium) Windows Server 2008 (Itanium) SP2 Windows 7 for 32-bit Systems Windows 7 for 32-bit Systems SP1 Windows 7 for x64-based Systems Windows 7 for x64-based Systems SP1 Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for x64-based Systems SP1 Windows Server 2008 R2 (Itanium) Windows Server 2008 R2 (Itanium) SP1
Vulnerability Description A remote code execution vulnerability has been reported in the way that the Microsoft Server Message Block (SMB) client validates specially crafted SMB responses. The SMB Protocol is a network file sharing protocol that is implemented in Microsoft Windows. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system.

Update/Patch Available Apply patches: Microsoft Security Bulletin MS11-019
Vulnerability Details The vulnerability is due to an error in the SMB client implementation that improperly validates specially crafted SMB responses. A remote attacker could exploit this issue by sending a specially crafted SMB response to a client-initiated SMB request. Successful exploitation of this vulnerability could allow the attacker to take complete control of an affected system.

Protection Overview
This protection will detect and block specially crafted SMB responses. IPS-1 has been preemptive against this issue since April 10 of 2010. No protection is required for IPS-1 users.

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 SMB Client Crafted Response Parsing Code Execution (MS11-019) 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: Windows SMB Protection Violation
Attack Information: Microsoft SMB client crafted response parsing code execution (MS11-019)

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 SMB Client Crafted Response Parsing Code Execution (MS11-019) 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: Windows SMB Protection Violation
Attack Information: Microsoft SMB client crafted response parsing code execution (MS11-019)

VPN-1 NGX R65 & VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks.
2. Select the following:

Microsoft SMB Client Crafted Response Parsing Code Execution (MS11-019)

3. In the configuration pane, under Settings > Mode, check Active.
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: Windows SMB Protection Violation
Attack Information: Microsoft SMB client crafted response parsing code execution (MS11-019)

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?

1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Network Security > SMB, and select the Transaction Commands protection group.
3. Click Microsoft SMB Client Transaction Memory Corruption (MS10-020) (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entries will be logged:

Alert Name: SMB Trans Commands
Description: Microsoft SMB Client Transaction Memory Corruption (MS10-020)

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