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Update Protection against Microsoft Active Directory and MIT Kerberos Null Pointer Dereference Vulnerability (MS10-014)

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Check Point Reference: CPAI-2010-030
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS10-014
Industry Reference(s): CVE-2010-0035
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 Server 2003 SP2
Windows Server 2003 x64 Edition SP2
Windows Server 2003 with SP2 (Itanium)
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 for (Itanium) SP2
Vulnerability Description
In a Windows Active Directory environment in which an MIT Kerberos realm is trusted by an Active Directory domain, a user who is a member of the MIT Kerberos realm can be authenticated by Windows using the cross-realm trust established between the Active Directory and the MIT Kerberos realm.
A denial of service vulnerability exists in implementations of MIT Kerberos. The Kerberos protocol is used to mutually authenticate users and services on an open and unsecured network. It allows services to correctly identify the user of a Kerberos ticket without having to authenticate the user at the service. It does this by using shared secret keys. A remote attacker may exploit this vulnerability to create a denial of service condition, causing the affected system to stop responding.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS10-014
Vulnerability Details
The vulnerability is caused by incorrect handling of ticket renewal requests coming from a non-Windows Kerberos domain. When an MIT Kerberos user logs on to an Active Directory domain joined machine, they will be issued a Kerberos referral TGT (Ticket Granting Ticket) from the MIT Kerberos realm. Windows clients will never attempt to renew this referral TGT. A remote attacker running a malicious Kerberos client could attempt to renew the referral TGT which would result in a null pointer dereference inside of LSASS.EXE on the domain controller causing the domain controller to reboot.

Protection Overview
This protection will detect and block Kerberos renewal requests from a non-renewable connection.

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 Active Directory-MIT Kerberos Null Pointer Dereference (MS10-014)

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 Kerberos Protection Violation
Attack Information: Microsoft Active Directory-MIT Kerberos null pointer dereference (MS10-014)

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 Active Directory-MIT Kerberos Null Pointer Dereference (MS10-014).
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 Kerberos Protection Violation
Attack Information: Microsoft Active Directory-MIT Kerberos null pointer dereference (MS10-014)

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 > Kerberos, and select the Active Directory protection group.
3. Click Microsoft Active Directory-MIT Kerberos Null Pointer Dereference (MS10-014) (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: MS AD Kerberos
Description: Microsoft Active Directory-MIT Kerberos Null Pointer Dereference (MS10-014)