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Update Protection against Microsoft Windows Security Support Provider SChannel Spoofing Vulnerability (MS09-007)

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Check Point Reference: CPAI-2009-038
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS09-007
Industry Reference(s): CVE-2009-0085
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
  • NGX R62
  • NGX R61
  • NGX R60
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
Windows XP Professional x64 Edition SP2
Windows Server 2003 SP1
Windows Server 2003 SP2
Windows Server 2003 x64 Edition
Windows Server 2003 x64 Edition SP2
Windows Server 2003 with SP1 (Itanium)
Windows Server 2003 with SP2 (Itanium)
Windows Vista
Windows Vista SP1
Windows Vista x64 Edition
Windows Vista x64 Edition SP1
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for x64-based Systems
Windows Server 2008 (Itanium)
Vulnerability Description
A spoofing vulnerability has been reported in the Microsoft Windows Security Support Provider (SSP) SChannel authentication component when using certificate based authentication. SSP is a dynamic-link library (DLL) that implements a common interface between transport-level applications and security providers by making one or more security packages available to applications. Security packages support security protocols such as Kerberos authentication and Secure Channel (SChannel) authentication. A remote attacker may exploit this vulnerability to authenticate against a protected server, despite not having access to the authorized user's private key, which is normally required for successful authentication when the server is configured to require client authentication.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS09-007
Vulnerability Details
The vulnerability is due to an error in the SChannel authentication component that fails to sufficiently validate certain Transport Layer Security (TLS) handshake messages to ensure that the client does in fact have access to the private key linked to the certificate used for authentication. A remote attacker may exploit this flaw if he will be able to gain access to the public component of the actual certificate used by the end user for authentication. He could then craft a TLS packet to bypass the SChannel component's validation. Successful exploitation of the issue will allow the attacker to impersonate another user and authenticate against a protected server using the public component of the user’s authentication credential.

Protection Overview
By enabling this protection, SmartDefense will detect and block attempts to exploit the spoofing vulnerability. IPS-1 will detect and block attempts by SSL clients to skip client certificate verification.

In order for the protection to be activated, update your Security Gateway/VPN-1 product to the latest SmartDefense update. For information on how to update 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 > VPN Protocols.
2. In the right pane, double-click the following protection:

Microsoft Windows Security Support Provider SChannel Spoofing (MS09-007)

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: Invalid SSL Packet
Attack Information: Microsoft Windows security support provider SChannel spoofing (MS09-007)

VPN-1 NGX R65 & R62

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > VPN Protocols > Microsoft Windows Security Support Provider SChannel Spoofing (MS09-007).
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: Invalid SSL Packet
Attack Information: Microsoft Windows security support provider SChannel spoofing (MS09-007)

VPN-1 NGX R61 & R60

How Can I Protect My Network?
1. In the Application Intelligence tree, click VPN Protocols.
2. Select the following:

Microsoft Windows Security Support Provider SChannel Spoofing (MS09-007)

3. Install security policy on all modules.

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

Attack Name: Invalid SSL Packet
Attack Information: Microsoft Windows security support provider SChannel spoofing (MS09-007)

VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > VPN Protocols > Microsoft Windows Security Support Provider SChannel Spoofing (MS09-007).
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: Invalid SSL Packet
Attack Information: Microsoft Windows security support provider SChannel spoofing (MS09-007)

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 > SSL, and select the SSLv3/TLS Client Certificate protection group.
3. Click CVE-2009-0085 Schannel Client Certificate Spoofing (MS09-007) - (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: SSLv3/TLS Client Certificate
Description: CVE-2009-0085 Schannel Client Certificate Spoofing (MS09-007)