Cheers Bink for this update on a forgotten SP1 patrch, released now for XP.
Windows XP Security Patch: Flaw in SMB Signing Could Enable Group Policy to be Modified
A security vulnerability has been identified that could allow an attacker to disrupt a facility by which security settings are applied to Windows-based computers in a corporate network. This could allow the attacker to loosen settings on his or her own computer or impose tighter ones on someone else's. Network administrators can help eliminate this issue by installing this update.
Reason for Revision: Subsequent to releasing this bulletin it was determined that the fix was not included in Microsoft Windows XP Service Pack 1. The bulletin has been updated to reflect this, and the patch had been updated so that it installs on Windows XP Service Pack 1 systems. Customers who are currently running XP Service Pack 1 should apply the patch.
Download: Q328170_WXP_SP2_x86_ENU.exe
View: Download Info
News source: Microsoft Security Bulletin MS02-070