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Microsoft Windows 2000 Telnet Service contains handle leak

Vulnerability Note VU#215259

Original Release Date: 2001-09-18 | Last Revised: 2001-09-18

Overview

The Microsoft Windows 2000 Telnet Service contains a denial-of-service vulnerability that allows remote attackers to disrupt the telnet service on affected servers.

Description

The Microsoft Windows 2000 Telnet Service contains a resource starvation vulnerability that prevents the server from releasing handles when telnet sessions are terminated in a specific manner. If a sufficiently large number of session requests are established and then terminated in this manner, it is possible to consume all available handle resources, resulting in a denial-of-service attack against all services offered by the victim server.

Impact

This vulnerability allows a remote attacker to disrupt or crash affected Windows 2000 servers, resulting in a denial-of-service condition.

Solution

Apply a patch from your vendor

Microsoft has released a patch for this vulnerability; for further information, please consult the systems affected section below.

Disable telnet service


Sites that do not require the Windows 2000 Telnet Service may disable it to prevent exploitation of this vulnerability.

Vendor Information

215259
 

Microsoft Affected

Updated:  September 14, 2001

Status

Affected

Vendor Statement

Microsoft has addressed this vulnerability in the following Microsoft Security Bulletin

Vendor Information

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

Addendum

The CERT/CC has archived Microsoft's announcement of MS01-031 at


CVSS Metrics

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References

Acknowledgements

This document was written by Jeffrey P. Lanza and is based on information provided by Microsoft.

Other Information

CVE IDs: CVE-2001-0346
Severity Metric: 11.81
Date Public: 2001-06-07
Date First Published: 2001-09-18
Date Last Updated: 2001-09-18 23:27 UTC
Document Revision: 14

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