Vulnerability Note VU#250635

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

Original Release date: 23 Aug 2002 | Last revised: 19 Aug 2003

Overview

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.

Description

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.

Impact

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.

Solution

Apply a patch

For more information, see:

http://www.microsoft.com/technet/treeview/?url=/technet/security/bulletin/MS02-045.asp


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.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected15 Jul 200223 Aug 2002
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

References

Credit

Thanks to Ivan Arce for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

  • CVE IDs: CAN-2002-0724
  • Date Public: 22 Aug 2002
  • Date First Published: 23 Aug 2002
  • Date Last Updated: 19 Aug 2003
  • Severity Metric: 5.02
  • Document Revision: 16

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