Home Page | Skip to Navigation | Skip to Content | Skip to Search | Skip to Footer

Microsoft SMB Crafted Write Request Denial of Service (MS11-048; CVE-2011-1267)

Subscribe

Check Point Reference: CPAI-2011-295
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS11-048
Industry Reference(s): CVE-2011-1267
Protection Provided by: Security Gateway
  • R75
  • R71
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Vulnerability Description
A denial of service vulnerability exists in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB requests. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted network message to a computer running the Server service.
Update/Patch Available
Apply patches from Microsoft Security Bulletin MS11-048
Vulnerability Details
This is a denial of service vulnerability. The vulnerability is caused when the Microsoft Server Message Block (SMB) Protocol software improperly handles specially crafted SMB requests. An attacker who exploited this vulnerability could cause the affected system to stop responding until it is manually restarted. Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests.

Protection Overview
This protection detects and block malicious SMB2 write requests.

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 and find the Microsoft SMB Crafted Write Request Denial of Service (MS11-048) protection using the Search tool and Edit the protection's settings.
  2. 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 SMB Crafted Write Request Denial of Service (MS11-048)

IPS-1 & IPS1-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 > SMB, and select the SMB2 Write protection group.
3. Click Microsoft SMB Crafted Write Request Denial of Service (MS11-048) (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: SMB2 Write
Description: Microsoft SMB Crafted Write Request Denial of Service (MS11-048)