Vulnerability Note VU#342243

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

Original Release date: 23 Aug 2002 | Last revised: 02 Jul 2003

Overview

Microsoft Server Message Block (SMB) is a protocol for sharing data and resources between computers. SMB may crash upon receipt of a crafted SMB_COM_TRANSACTION packet requesting a NetShareEnum transaction. Attackers can use this vulnerability to cause a denial of service. SMB is included in many versions of Microsoft Windows.

Description

SMB will crash if it receives a crafted SMB_COM_TRANSACTION packet requesting a NetShareEnum transaction, with field "Max Param Count" or "Max Data Count" set to zero (0). On exploitation, the crashed host condition exhibits a blue screen. This vulnerability can be exploited by an attacker with access to a user account on the target system. By default, anonymous users have the required access to exploit this vulnerability; therefore on most Windows systems an attacker does not need to be authenticated.

Impact

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

Solution

Apply a patch

For more information about patches, 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. This will not prevent authenticated users from exploiting this vulnerability, and may 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 of CORE Security Technologies 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: 02 Jul 2003
  • Severity Metric: 5.02
  • Document Revision: 16

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