Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Vulnerability Alert

Microsoft Windows SMB Client Remote Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:19422
Version:4
First Published:2009 November 12 18:53 GMT
Last Published:2010 April 14 14:29 GMT
Port: 445
CVE:CVE-2009-3676
BugTraq ID:36989
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:

Additional products affected by the Microsoft Windows SMB client remote denial of service vulnerability have been identified.

 
 
Description

Microsoft Windows Server 2008 R2 and Windows 7 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS)?condition.

The vulnerability exists in the SMB client.? An unauthenticated, remote attacker could exploit this vulnerability by creating a malicious SMB server and convincing a targeted user to connect to that server.? An exploit could cause the targeted user's operating system to stop responding to requests, resulting in a DoS condition.

Exploit code is publicly available.

Microsoft has confirmed this vulnerability in a security bulletin and released updated software.

 
Warning Indicators

The following versions of Windows are affected:

  • Windows 2000 SP4 and prior
  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows 7 for 32-bit Systems
  • Windows 7 for x64-based Systems
  • Windows Server 2008 R2 for x64-based Systems
  • Windows Server 2008 R2 for Itanium-based Systems
 
IntelliShield Analysis

To?exploit this vulnerability, the attacker must convince a targeted user to connect to a malicious SMB server.? An attacker could embed a connection request in a web page and convince the targeted user to visit that page.? Attempts to exploit this vulnerability will likely require the use of social engineering tactics, such as sending a link to the site via e-mail, instant messaging, or other forms of communication.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-020

Microsoft has released a security advisory at the following link: 977544 

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition on the targeted system.

 
Technical Information

The vulnerability exists in the KeAccumulateTicks() function of the SMB client.  The client fails to properly handle incomplete responses sent by a SMB server.  An unauthenticated, remote attacker could create a malicious SMB or SMB2 server and convince the targeted user to connect to either server.  If successful, the targeted user's system could stop responding to requests, leading to a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Users are advised not to connect to untrusted SMB servers.

Users are advised not to open e-mail messages from suspicious or unrecognized sources.? If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

Users should verify that unsolicited links are safe to follow.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin.? These updates are also distributed by Windows automatic update features and available on the Windows Update website.? Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
22339/0Microsoft Windows SMB Denial Of ServiceS4492009 Nov 19 
 
Alert History
 

Version 3, April 13, 2010, 3:23 PM: Microsoft has released a security bulletin to address the Microsoft Windows SMB client remote denial of service vulnerability.

Version 2, November 16, 2009, 12:29 PM: Microsoft has released a security advisory that confirms the Microsoft Windows SMB client remote denial of service vulnerability.

Version 1, November 12, 2009, 1:53 PM: Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are not available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Windows 2000 Advanced Server SP4 | Datacenter Server SP4 | Professional SP4 | Server SP4
Microsoft, Inc.Windows 7 for 32-bit systems Base | for x64-based systems Base
Microsoft, Inc.Windows Server 2003 Datacenter Edition SP2 | Datacenter Edition, 64-bit (Itanium) SP2 | Datacenter Edition x64 (AMD/EM64T) SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit (Itanium) SP2 | Enterprise Edition x64 (AMD/EM64T) SP2 | Standard Edition SP2 | Standard Edition, 64-bit (Itanium) SP2 | Standard Edition x64 (AMD/EM64T) SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base | Itanium-Based Systems Edition Base
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2
Microsoft, Inc.Windows XP Home Edition SP2, SP3 | Professional Edition SP2, SP3 | Professional x64 (AMD/EM64T) SP2

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield