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Update Protection against Microsoft Windows Telnet Services Credential Reflection Code Execution Vulnerability (MS09-042)

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Check Point Reference: CPAI-2009-159
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS09-042
Industry Reference(s): CVE-2009-1930
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Microsoft Windows 2000 SP4
Windows XP SP2
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
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 7 (Itanium)
Vulnerability Description
A remote code execution vulnerability has been reported in the way Microsoft Windows Telnet Service handles NTLM credentials. Telnet is a bidirectional communications protocol that allows for command line remote administration over the TCP protocol. The vulnerability allows a remote attacker to replay the user's credentials back to them, creating a reflection attack, and enabling execution of arbitrary code in the context of the logged-on user.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS09-042
Vulnerability Details
The vulnerability is due to an error in the Telnet protocol that fails to ensure that a user's credentials are not reflected back and used against the user. An attacker who successfully executed a reflection attack could take complete control of an affected system.

Protection Overview
This protection will detect and block attempts to reflect NTLM credentials via the Telnet protocol.

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 Microsoft Telnet Services Credential Reflection Code Execution (MS09-042) 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 Telnet services credential reflection code execution (MS09-042)

VPN-1 NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks > Microsoft Telnet Services Credential Reflection Code Execution (MS09-042).
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 Telnet services credential reflection code execution (MS09-042)

VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Microsoft Networks > Microsoft Telnet Services Credential Reflection Code Execution (MS09-042).
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 Telnet services credential reflection code execution (MS09-042)

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 Application Intelligence > Authentication, and select the Windows Challenge\Response Reflection Monitor protection group.
3. Click Windows challenge-response Reflection (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: Reflection Monitor
Description: Windows challenge-response Reflection