Update Protection against Microsoft Windows Workstation Service "NetrWkstaUserEnum" Denial of Service Vulnerability
| Check Point Reference: | CPAI-2007-050 | |
| Date Published: | ||
| Severity: | ||
| Last Updated: | ||
| Source: | Secunia Advisory: SA23487 | |
| Industry Reference(s): | CVE-2006-6723 | |
| Protection Provided by: |
VPN-1
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| Who is Vulnerable? Microsoft Windows 2000 SP4 Microsoft Windows XP SP1 Microsoft Windows XP SP2 Microsoft Windows XP Professional x64 Edition | ||
| Vulnerability Description A denial of service vulnerability has been reported in the Microsoft Windows Workstation service. Microsoft Windows workstation service routes local file system requests and remote file or print network requests via Remote Procedure Call (RPC). An attacker may exploit this vulnerability to create a denial of service condition on an affected system. |
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Vulnerability Details The vulnerability is due to an error in the Microsoft Windows Workstation Service that fails to properly handle specially crafted ‘NetrWkstaUserEnum’ RPC requests. A remote attacker can exploit this issue by specially crafting a malicious RPC request and sending it an affected system. Successful exploitation may create a temporary denial of service condition on the target host. |
Protection Overview
By enabling this protection, SmartDefense will detect and block malformed RPC requests.
In order for the protection to be activated, update your VPN-1/InterSpect 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.
Additional Information
The Update released on April 15, 2007 includes the following protections:
Symantec Veritas NetBackup Code Execution Vulnerability (CPAI-2007-045)
Oracle ORADC ActiveX Control Code Execution Vulnerability (CPAI-2007-046)
Trend Micro ServerProtect Buffer Overflow Vulnerabilities (CPAI-2007-047)
Novell Netmail WebAdmin Buffer Overflow Vulnerability (CPAI-2007-048)
Novell NetMail IMAP Verb Literal Buffer Overflow Vulnerability (CPAI-2007-049)
Microsoft Windows Workstation Service Vulnerability (CPAI-2007-050)
Trend Micro OfficeScan ActiveX Buffer Overflow Vulnerability (CPAI-2007-051)
Protect Yourself against FTP Brute Force Attacks (SBP-2007-05)
Protect Yourself against FTP Format Strings Attacks (SBP-2007-06)
VPN-1 NGX R65 & R62
How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > MS-RPC > MS-RPC over CIFS > Block Workstation UserEnum Vulnerability.
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: MS-RPC Enforcement Violation
Attack Information: Workstation UserEnum vulnerability
VPN-1 NGX R61, R60 & VPN-1 NG with Application Intelligence R55W
How Can I Protect My Network?
1. In the SmartDefense tree, click Application Intelligence > MS-RPC > MS-RPC over CIFS.
2. Select the following:
Block Workstation UserEnum Vulnerability
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: MS-RPC Enforcement Violation
Attack Information: Workstation UserEnum vulnerability
VPN-1 NG with Application Intelligence R55
How Can I Protect My Network?
1. In the SmartDefense tree, click Application Intelligence > MS-RPC > MS-RPC over CIFS.
2. Select the following:
Block Workstation UserEnum Vulnerability
3. Install policy on all modules.
How Do I Know if My Network is Under Attack?
Rule #99459 will appear on the SmartView Tracker.
VPN-1 VSX NGX
How Can I Protect My Network?
1. In the SmartDefense tree, click Application Intelligence > MS-RPC > MS-RPC over CIFS.
2. Select the following:
Block Workstation UserEnum Vulnerability
3. Install policy on all modules.
How Do I Know if My Network is Under Attack?
Rule #99459 will appear on the SmartView Tracker.
InterSpect NGX
How Can I Protect My Network? Block Workstation UserEnum Vulnerability
1. In the lefthand menu, click Profiles > Default Protection > SmartDefense. The SmartDefense page opens.
2. In the SmartDefense tree, click Application Intelligence > MS-RPC > MS-RPC over CIFS and enable the following protection:
3. Install security policy.
How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: MS-RPC Enforcement Violation
Attack Information: Workstation UserEnum vulnerability
InterSpect 2.0
How Can I Protect My Network? Block Workstation UserEnum Vulnerability 2. Install security policy.
1. Click Application Intelligence > RPC > MS-RPC over CIFS and enable the following protection:
How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: MS-RPC Enforcement Violation
Attack Information: Workstation UserEnum vulnerability