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Windows Anonymous Named Pipe Connection Information Disclosure
Secunia Advisory: SA14189
Release Date: 2005-02-08
Last Update: 2005-11-21
Popularity: 15,109 views

Critical:
Not critical
Impact: Exposure of system information
Where: From local network
Solution Status: Vendor Patch

OS:Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows XP Embedded
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

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CVE reference:CVE-2005-0051
CVE-2005-2150


Description:
Jean-Baptiste Marchand has reported a weakness in Microsoft Windows 2000 and XP, which can be exploited by malicious people to gain knowledge of certain system information.

The weakness is caused due to an unspecified error in the process used for validating authentication information when clients establish anonymous logons using named pipe connections.

Successful exploitation discloses the usernames of users with an open connection to an available shared resource. On Windows 2000, successful exploitation allows enumeration of Windows services and discloses information of the Application and System eventlogs.

Solution:
Apply patches.

Windows XP (requires Service Pack 1 or Service Pack 2):
http://www.microsoft.com/downloads/de...=B8C867C2-B7CD-4E2F-90E0-169B2C7125DC

Windows XP 64-Bit Edition (requires Service Pack 1 (Itanium)):
http://www.microsoft.com/downloads/de...=2F68945E-EEB8-42BC-A8AD-0D3991204889

Microsoft Windows XP Embedded (with SP2):
http://www.microsoft.com/downloads/de...=f1a43063-349b-4352-847f-947bd263f5fd

Microsoft Windows XP Embedded (with SP1):
http://www.microsoft.com/downloads/de...=3b389bea-6617-4daf-a4c7-62f23097961c

Windows 2000 (requires Service Pack 4):
Apply Update Rollup 1
http://support.microsoft.com/kb/891861

Provided and/or discovered by:
Jean-Baptiste Marchand, Herve Schauer Consultants.

Changelog:
2005-02-09: Added link to US-CERT vulnerability note.
2005-07-07: Added CVE reference and updated "Description", "Solution", and "OS Information" sections to include Windows 2000.
2005-11-21: Added patch information for Windows XP Embedded.

Original Advisory:
MS05-007 (KB888302):
http://www.microsoft.com/technet/security/bulletin/ms05-007.mspx

Other References:
US-CERT VU#939074:
http://www.kb.cert.org/vuls/id/939074


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