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Preemptive Protection against Microsoft Terminal Server Denial of Service (MS12-020; CVE-2012-0152)

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Check Point Reference: CPAI-2012-099
Date Published:
Preemptive Since:
Severity:
Source: Microsoft Security Bulletin MS12-020
Industry Reference(s): CVE-2012-0152
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Windows 7 for 32-bit Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Vulnerability Description
A denial of service vulnerability has been reported in Microsoft Remote Desktop Protocol.
Update/Patch Available
Apply patches from: MS12-020
Vulnerability Details
The vulnerability is caused when the affected service processes a sequence of specially crafted packets. A remote attacker may exploit this issue by sending a sequence of specially crafted packets to the target. Successful exploitation could cause the service to crash, resulting in a denial of service condition.

Protection Overview
IPS will detect and block the transferring of specially crafted packets.

No update is required to address this vulnerability.

Users are protected against this vulnerability if the SYN Attack protection has been activated and configured.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?

  1. In the IPS tab, click Protections, find the SYN Attack protection using the Search tool and double-click on the protection. 
  2. In the Protection Details window, select the required profile and then click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings. 
  3. Configure the protection to your requirements. 
  4. Install policy on all modules.

    5. How Do I Know if My Network is Under Attack?
    SmartView Tracker will log the following entries:
    Attack Name: TCP Enforcement Violation
    Attack Information: Under SYN attack - Switching to active protection
    Attack Information: SYN attack abated - Switching to passive protection

IPS-1 NGX R65 & IPS-1

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 > TCP , and select the Synflood protection group.
  3. Click TCP synfllod.
  4. Configure the “Time interval (in seconds) to enumerate synfloods”, “Threshold number of timed out connections to a single port” and “flood source table prune interval” to your requirements.
  5. In the configuration pane, under Settings, check Active.
  6. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entries will be logged:

Alert Name: TCP synflood.
Description: Synflood.