Vulnerability Note VU#994851

Microsoft Services for UNIX Telnet server is vulnerable to denial of service via memory leak

Overview

The telnet server included in the Microsoft Services for Unix package contains a denial-of-service vulnerability that may cause the system to become unstable or crash.

I. Description

The telnet server included in the Microsoft Services for Unix (SFU) package contains a memory leak that can lead to excessive resource consumption on affected systems.

This vulnerability affects Microsoft Windows NT 4.0 and Windows 2000 systems that have the SFU package installed. It does not affect the telnet server that ships with Windows NT 4.0 and Windows 2000.

II. Impact

By sending repeated requests to an affected Microsoft telnet server, attackers can consume all available memory resources, resulting in a denial-of-service condition.

III. Solution

Microsoft has released the following patches to address this vulnerability

http://www.microsoft.com/Downloads/Release.asp?ReleaseID=31601

http://www.microsoft.com/Downloads/Release.asp?ReleaseID=31595

Systems Affected

Vendor	Status	Date Updated
Microsoft	Vulnerable	7-Aug-2001

References

http://www.kb.cert.org/vuls/id/581603
http://www.microsoft.com/technet/security/bulletin/MS01-039.asp
http://www.securityfocus.com/bid/3090

Credit

This vulnerability was reported to Microsoft by Peter Grundl.

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

Other Information

Date Public	07/24/2001
Date First Published	07/24/2001 06:13:11 PM
Date Last Updated	08/07/2001
CERT Advisory
CVE Name	CAN-2001-0505
Metric	4.25
Document Revision	11

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