Vulnerability Note VU#939074

Microsoft Windows XP named pipe fails to restrict anonymous access

Overview

The Server service running on Microsoft Windows XP leaks authentication information.

I. Description

The Server service (srvsvc.dll) is a component of the Server Message Block (SMB), and its follow-on, Common Internet File System (CIFS). These are network protocols that Windows uses to share files, printers, serial ports, and communicate between computers. If the Server service is running on Microsoft Windows XP, a remote attacker may be able to access it anonymously via a named pipe. In addition, if that attacker supplies the service with a specially crafted message, they will receive a response that may allow them to determine what other users are accessing a shared resource.

This vulnerability affects Microsoft Windows XP SP 1, Windows XP SP 2, and Windows XP 64-Bit Edition SP 1.

II. Impact

A remote, unauthenticated attacker may be able to access authentication information for users running Microsoft Windows XP.

III. Solution

Apply Patch

Microsoft has released Microsoft Security Bulletin MS05-007 to address this issue.

Disable the Computer Browser Service

Disabling the Computer service and restarting the affected system will help protect from remote attempts to exploit this vulnerability. Please see MS05-007 for details on how to disable the Computer Browser service.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	8-Feb-2005

References

http://www.us-cert.gov/cas/techalerts/TA05-039A.html
http://www.microsoft.com/technet/security/Bulletin/MS05-007.mspx
http://support.microsoft.com/?kbid=188001

Credit

This vulnerability was reported in Microsoft Security Bulletin MS05-007. Microsoft credits Jean-Baptiste Marchand with providing information regarding this issue.

This document was written by Jeff Gennari based on information provided in Microsoft Security Bulletin MS05-007.

Other Information

Date Public:	2005-02-08
Date First Published:	2005-02-08
Date Last Updated:	2005-02-10
CERT Advisory:
CVE-ID(s):	CAN-2005-0051
NVD-ID(s):	CAN-2005-0051
US-CERT Technical Alerts:
Metric:	4.86
Document Revision:	57

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