Vulnerability Note VU#367077

Microsoft ISA Server 2000 vulnerable to privilege escalation via "NETBIOS" connection

Overview

Microsoft Internet Security and Acceleration Server 2000 contains an elevation of privilege vulnerability that allows an attacker to create unintended NetBIOS service connections within the affected ISA Server host.

I. Description

Microsoft ISA Server 2000 contains firewall, virtual private networking, and web caching solutions. ISA Server 2000 contains a flaw in NetBIOS handling that allows an attacker to connect to NetBIOS services on the ISA Server 2000 host.

II. Impact

A remote, unauthenticated attacker may be able to connect to NetBIOS services on the affected ISA Server if the ISA Server host has enabled the NetBIOS (all) predefined packet filter.

III. Solution

Apply An Update

Please see Microsoft Security Bulletin MS05-034 for more information, such as workarounds and patches.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	14-Jun-2005

References

http://www.microsoft.com/technet/security/bulletin/MS05-034.mspx
http://securitytracker.com/alerts/2005/Jun/1014193.html

Credit

Thanks to Microsoft for information on this issue, who in turn credit Steve Orrin of Watchfire with reporting this vulnerability.

This document was written by Ken MacInnis.

Other Information

Date Public:	2005-06-14
Date First Published:	2005-06-14
Date Last Updated:	2005-07-06
CERT Advisory:
CVE-ID(s):	CAN-2005-1216
NVD-ID(s):	CAN-2005-1216
US-CERT Technical Alerts:
Metric:	10.83
Document Revision:	7

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Produced 2005 by US-CERT, a government organization
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