Vulnerability Note VU#250635

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

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.

II. Impact

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

http://www.microsoft.com/technet/treeview/?url=/technet/security/bulletin/MS02-045.asp
http://www.securityfocus.com/bid/5556

Credit

Thanks to Ivan Arce for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

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