Update Protection against Microsoft SMB Server Variable Validation Denial of Service Vulnerability (MS10-054)

Vulnerability
Protection

Check Point Reference:	CPAI-2010-235
Date Published:
Severity:
Last Updated:
Source:	Microsoft Security Bulletin MS10-054
Industry Reference(s):	CVE-2010-2551
Protection Provided by:	Security Gateway R71 R70 VPN-1 NGX R65 VSX NGX R65 IPS-1 IPS-1 IPS-1 NGX R65
Who is Vulnerable? Windows Vista Windows Vista SP1 Windows Vista SP2 Windows Vista x64 Edition 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 x64-based Systems Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 (Itanium)
Vulnerability Description A denial of service vulnerability has been reported in the Microsoft Windows Server Message Block (SMB) implementation. The SMB Protocol is a network file sharing protocol that is implemented in Microsoft Windows. A remote attacker may exploit this vulnerability to create a denial of service condition.

Update/Patch Available Apply patches: Microsoft Security Bulletin MS10-054
Vulnerability Details The vulnerability is due to insufficient validation by the Microsoft SMB Protocol software of an internal variable when parsing specially crafted SMB packets. A remote attacker could exploit this flaw by constructing a specially crafted SMB packet and sending it to a target server. Successful exploitation could cause a denial of service condition on the affected system.

Protection Overview
This protection will detect and block malformed SMB requests attempting to exploit this vulnerability.

Users of IPS-1 have been preemptive against this vulnerability since January 21, 2009. Follow instructions below to make sure this protection is activated on your IPS-1 machine.

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: 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 following protection:

Microsoft SMB Server Variable Validation Denial of Service (MS10-054)

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 Server variable validation denial of service (MS10-054)

VPN-1 NGX R65 & VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks > Microsoft SMB Server Variable Validation Denial of Service (MS10-054).
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

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 SMB Compliance protection group.
3. Click Large Blocksize in SMB session (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 entry will be logged:

Alert Name: SMB Compliance
Description: Large Blocksize in SMB session

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