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Microsoft Windows Server Message Block (SMB) fails to properly handle SMB_COM_TRANSACTION packets requesting NetServerEnum2 transaction

Vulnerability Note VU#250635

Original Release Date: 2002-08-23 | Last Revised: 2003-08-19


Microsoft Server Message Block (SMB) may crash when it receives a crafted SMB_COM_TRANSACTION packet requesting a NetServerEnum2 transaction. Attackers can use this vulnerability to cause a denial of service.


SMB is a protocol for sharing data and resources between computers. It is included in many versions of Microsoft Windows.

SMB will crash if it receives a crafted SMB_COM_TRANSACTION packet requesting a NetServerEnum2 transaction. If either the 'Max Param Count' field or the 'Max Data Count' field of the packet is set to zero (0), the destination SMB host will crash with a blue screen. This vulnerability can be exploited by both local and remote attackers.


Remote attackers can cause a denial of service. Attackers may also be able to execute arbitrary code, though this has not been demonstrated or proven.


Apply a patch

For more information, see:

Disable anonymous access

Disable anonymous SMB access. See Microsoft Knowledge Base Article 246261 for information about configuring anonymous access in Windows 2000. Note that disabling this access will not prevent authenticated users from exploiting this vulnerability and may actually have adverse affects in mixed-mode domains.

Block or Restrict Access

Block access to SMB services (139/tcp, 445/tcp) from untrusted networks such as the Internet.

Vendor Information


Microsoft Corporation Affected

Notified:  July 15, 2002 Updated: August 23, 2002



Vendor Statement


Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

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

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Thanks to Ivan Arce for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs: CVE-2002-0724
Severity Metric: 5.02
Date Public: 2002-08-22
Date First Published: 2002-08-23
Date Last Updated: 2003-08-19 21:12 UTC
Document Revision: 16

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