Microsoft Windows Named Pipe Remote Information Disclosure Vulnerability



Date Discovered

February 8, 2005


A remote information disclosure vulnerability affects Microsoft Windows. This issue is due to a failure of the application to securely store potentially sensitive system information. An attacker may leverage this issue to disclose the user names of all users connected to a network share, potentially facilitating further attacks against affected computers.

Technologies Affected

  • Microsoft Windows XP 64-bit Edition
  • Microsoft Windows XP 64-bit Edition SP1
  • Microsoft Windows XP Home
  • Microsoft Windows XP Home SP1
  • Microsoft Windows XP Home SP2
  • Microsoft Windows XP Media Center Edition
  • Microsoft Windows XP Media Center Edition SP1
  • Microsoft Windows XP Media Center Edition SP2
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition SP1
  • Microsoft Windows XP Tablet PC Edition SP2


Block external access at the network boundary, unless external parties require service.
If possible, block external access to the affected computer. Permit access for trusted or internal networks and computers only. This includes blocking external access to TCP ports 139 and 445.

Disallow anonymous access to services. Permit access for trusted individuals only.
By limiting access to network shares to trusted users only, exposure to this issue can be limited.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
It is possible that some attacks resulting from this vulnerability may be detected by network intrusion detection systems (NIDS). Audit all applicable logs on a regular basis.

Microsoft has released updates to address this issue on supported platforms.



Jean-Baptiste Marchand is credited with the discovery of this issue.

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