Vulnerability Note VU#652537

Microsoft Windows SMB packet validation vulnerability

Original Release date: 08 Feb 2005 | Last revised: 11 May 2005


A vulnerability in the way that Microsoft Windows handles some SMB packets could allow remote attackers to execute code of their choosing on a vulnerable system.


The Microsoft Server Message Block (SMB), and its follow-on, Common Internet File System (CIFS), are network protocols that Windows uses to share files, printers, serial ports, and communicate between computers. A vulnerability exists in the way that the affected operating systems validate certain incoming SMB packets. Additional details about the underlying cause of the vulnerability are not known.

An unauthenticated remote attacker may be able to exploit this vulnerability by sending specially-crafted SMB packets to a vulnerable system. Microsoft reports that this vulnerability may also be exploited through a malicious web page. In this scenario, an attacker would need to trick or persuade a user into browsing the malicious web page or following a link to the malicious web page provided in an email message.


A remote, unauthenticated attacker could execute arbitrary code on a vulnerable system.


Apply a patch

Microsoft has published MS05-011 in response to this issue. Users are strongly encouraged to review this bulletin and apply the patches it refers to.


Filter network traffic
Microsoft Security Bulletin MS05-011 also contains recommendations about packet filtering to mitigate this issue. Users, particularly those who are affected but unable to apply the patches, are encouraged to implement these workarounds.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected-08 Feb 2005
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to Microsoft Security for reporting this vulnerability. Microsoft, in turn, credits eEye Digital Security with reporting this vulnerability to them.

This document was written by Chad R Dougherty, based upon information provided by Microsoft.

Other Information

  • CVE IDs: CAN-2005-0045
  • Date Public: 08 Feb 2005
  • Date First Published: 08 Feb 2005
  • Date Last Updated: 11 May 2005
  • Severity Metric: 27.09
  • Document Revision: 7


If you have feedback, comments, or additional information about this vulnerability, please send us email.