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Update Protection against Microsoft SMB Client Message Size Remote Code Execution Vulnerability (MS10-020)

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Check Point Reference: CPAI-2010-063
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS10-020
Industry Reference(s): CVE-2010-0477
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
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 remote code execution vulnerability has been reported in the Microsoft Windows Server Message Block (SMB) client implementation. The SMB Protocol is a network file sharing protocol that is implemented in Microsoft Windows. A remote attacker may exploit this vulnerability to take complete control of an affected system.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS10-020
Vulnerability Details
The vulnerability is due to an error in the Microsoft SMB client implementation that fails to properly handle specially crafted SMB responses that cause the SMB client to consume the entire response and indicate an invalid value to the Winsock kernel. A remote attacker could exploit this flaw by hosting a malicious SMB server that is designed to exploit this vulnerability and then convince a user to initiate an SMB connection with it. Successful exploitation may allow execution of arbitrary code on the target system.

Protection Overview
This protection will detect and block malformed SMB responses.

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

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 Client Message Size Remote Code Execution (MS10-020)

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 message size remote code execution (MS10-020)

VPN-1 NGX R65 & VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks > Microsoft SMB Client Message Size Remote Code Execution (MS10-020).
2. In the configuration pane, under Settings > Mode, check Active.
3. 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 message size remote code execution (MS10-019)

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 SMB2 Session Setup protection group.
3. Click Microsoft SMB Client Message Size Remote Code Execution (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: SMB2 Session Setup
Description: Microsoft SMB Client Message Size Remote Code Execution (MS10-020)