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Microsoft Security Bulletin MS02-070

Flaw in SMB Signing Could Enable Group Policy to be Modified (329170)

Originally posted: December 11, 2002
Updated: January 22, 2003


Who should read this bulletin:
System administrators using Microsoft® Windows® XP or Windows 2000, the latter especially in a domain controller role.

Impact of vulnerability:
Modify group policy.

Maximum Severity Rating:

Administrators whose Windows 2000 or Windows XP systems that are configured to use SMB Signing should install the patch immediately.

Affected Software:

  • Microsoft Windows 2000
  • Microsoft Windows XP

End User Bulletin:
An end user version of this bulletin is available at:

General Information

Technical details

Frequently asked questions

Patch availability

Other information:


  • Microsoft Knowledge Base article 329170 discusses this issue and will be available approximately 24 hours after the release of this bulletin. Knowledge Base articles can be found on the Microsoft Online Support web site.
  • Technical support is available from Microsoft Product Support Services. There is no charge for support calls associated with security patches.

Security Resources: The Microsoft TechNet Security Web Site provides additional information about security in Microsoft products.


The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.


  • V1.0 (December 11, 2002): Bulletin Created.
  • V1.1 (December 19, 2002): Updated Registry Key information in Verifying Patch Installation section
  • V2.0 (January 22, 2003): Subsequent to the release of this bulletin, it was determined that the fix described here was not included in XP Service Pack 1. The bulletin and patch have been updated to reflect this.