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 SMB2 Remote Code Execution Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:19000
Version:7
First Published:2009 September 08 15:49 GMT
Last Published:2009 October 13 18:10 GMT
Port: Not available
CVE:CVE-2009-3103
BugTraq ID:36299
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:8.3
 
Version Summary:

Microsoft has released a security advisory and updated software to address the Microsoft Windows SMB2 remote code execution vulnerability.

 
 
Description

Microsoft Windows Vista SP2 and prior and Windows Server 2008 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code.

The vulnerability is due to errors when processing protocol headers in Server Message Block version 2 (SMB2) Negotiate Protocol Request messages.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious network request to the vulnerable system.  Successful exploitation could allow the attacker to cause the vulnerable system to restart, resulting in a DoS condition. Alternatively, the attacker may be able to execute arbitrary code.

Exploit code that can achieve code execution is publicly available; however, the exploit code does not work on Vista without SP1.

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

 
Warning Indicators

Systems running the following versions of Microsoft Windows are vulnerable:

  • Microsoft Windows Vista SP2 and prior
  • Microsoft Windows Vista x64 Edition SP2 and prior
  • Microsoft Windows Server 2008 SP2 and prior
  • Microsoft Windows Server 2008 for x64-based Systems SP2 and prior
  • Microsoft Windows Server 2008 for Itanium-based Systems SP2 and prior
 
IntelliShield Analysis

Attackers may require access to trusted, internal systems to trigger an exploit.  Sites typically block SMB network requests from remote, untrusted sources, reducing the potential for an external attack.

Windows Vista systems without file sharing enabled may not have a vector that could be used for an exploit, and those with host-based firewalls enabled may block unsolicited SMB2 requests from untrusted or external systems, preventing exploitation.  Windows Server systems may be more exposed, particularly systems that host file shares that must be widely accessible.

Proof-of-concept code may trigger a stop error on a targeted system, causing the system to fail and automatically restart, which results in a DoS condition while the system restarts.

The recent security advisory from Microsoft indicates the vulnerability could be exploited to accomplish code execution, and such an exploit has been publicly released.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the October 2009 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for October 2009

 
Vendor Announcements

Microsoft has released a security advisory at the following link: 975497Microsoft has released a security bulletin at the following link: MS09-050

US-CERT has released a vulnerability note at the following link: VU#135940

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with elevated privileges or to cause the affected system to fail and restart, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to errors when processing protocol headers in SMB2 Negotiate Protocol Request messages.  The _Smb2ValidateProviderCallback() function in the Windows SMB2 srv2.sys component fails to properly check the size of headers in SMB2 messages before using that input in memory operations.  The processing of malformed input could cause an invalid pointer dereference, triggering a memory error.

An unauthenticated, remote attacker could exploit the vulnerability by sending a malicious request to the targeted system.  As a result, the attacker could manipulate memory pointers, potentially causing memory corruption.  The memory corruption could cause the system to fail and automatically restart, or the attacker could use the error to execute arbitrary code with elevated privileges.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to restrict network access to affected systems.

Administrators may consider disabling SMB2.  This can be accomplished by using a script provided by Microsoft at the following link: 975497

Administrators are advised to monitor critical systems.

 
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
20961/0Windows SMB Process ID High DoSS4322009 Sep 08 
21301/0Windows SMB2 Field Remote Code ExecutionS4382009 Sep 29 
Cisco Small Business IPS
Signature IDSignature NameReleaseLatest Release Date
SBIPS2009-000963/Windows SMB2 Field Remote Code ExecutionSBIPS0000012010 Jan 15 
 
Alert History
 

Version 6, September 29, 2009, 5:27 PM:  A clarification was necessary in the text of the Microsoft Windows SMB2 remote code execution vulnerability.

Version 5, September 29, 2009 11:10 AM:  Functional exploit code is publicly available for the Microsoft Windows SMB2 remote code execution vulnerability.

Version 4, September 21, 2009 11:51 AM:  Microsoft has released an official workaround for the Microsoft Windows SMB2 remote code execution vulnerability.

Version 3, September 18, 2009, 4:45PM:  Additional technical information is available regarding the Microsoft Windows SMB2 remote code execution vulnerability.  US-CERT has released a vulnerability note.

Version 2, September 9, 2009, 10:52 AM:  Microsoft has released a security advisory to address the Microsoft Windows SMB2 remote code execution vulnerability.

Version 1, September 8, 2009, 11:49 AM: Microsoft Windows Vista 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 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 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

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