Vulnerability Note VU#471260

Microsoft Windows logon process fails contains a buffer overflow during the logon process

Overview

The Windows Logon process (Winlogon) contains a vulnerability that may permit a remote attacker to execute arbitrary code on the system.

I. Description

The Windows logon process (Winlogon) containss a buffer overflow vulnerability during the processeing of the domain value. It fails to perform checks on the size of the domain value used during the logon process before inserting it into a fixed-size buffer. Microsoft notes that systems that are not members of a domain are not affected by this vulnerability. The following systems are affected by this vulnerability:

Windows 2000
Windows XP
Windows NT 4.0

Microsoft notes that "An attacker would require permission to modify user objects in a domain to attempt to exploit this vulnerability. Typically, only members of the Administrators or Account Operators groups would have this permission. However, this permission may have been delegated to other user accounts in the domain."

II. Impact

A remote attacker could execute arbitrary code on the system.

III. Solution

Apply a patch from the vendor

Microsoft Security Bulletin MS04-011 contains patch information to resolve this issue.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	13-Apr-2004

References

http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx

Credit

Thanks to Microsoft for reporting this vulnerability.

This document was written by Jason A Rafail.

Other Information

Date Public:	2004-04-13
Date First Published:	2004-04-13
Date Last Updated:	2004-04-13
CERT Advisory:
CVE-ID(s):	CAN-2003-0806
NVD-ID(s):	CAN-2003-0806
US-CERT Technical Alerts:
Metric:	13.50
Document Revision:	6

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