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             AUSCERT External Security Bulletin Redistribution

                              ESB-2010.1174.2
         Microsoft IIS FTP server memory corruption vulnerability
                             24 December 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft IIS 7.5.7600.16385 and prior
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2010-3972  

Original Bulletin: 
   http://www.kb.cert.org/vuls/id/842372

Comment: At present Microsoft has not yet released an update to correct this
         vulnerability. It is recommended that administrators implement
         appropriate firewall rules to restrict access to affected systems.

Revision History:  December 24 2010: Added CVE
                   December 23 2010: Initial Release

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Vulnerability Note VU#842372
Microsoft IIS FTP server memory corruption vulnerability

Overview
Microsoft IIS FTP server 7.5 is affected by a pre-authentication memory 
corruption vulnerability.

I. Description

A specifically crafted request sent to the IIS FTP service can result in memory 
corruption causing the service to crash. A denial-of-service exploit has been 
released to the public. IIS 7.5.7600.16385 on Windows 7 is reported to be 
affected. Other versions may also be affected.

II. Impact

An attacker can cause a denial of service. Depending on the specifics of the
vulnerability, an attacker could potentially execute arbitrary code.

III. Solution

We are currently unaware of a practical solution to this problem.

Restrict Access
Appropriate firewall rules should be implemented to restrict access to trusted 
sources. Customers of IPS vendors should request updated signatures for this 
vulnerability and block related traffic.

Vendor Information

Vendor			Status			Date Notified	Date Updated
Microsoft Corporation	Affected		2010-12-22

References

http://secunia.com/advisories/42713
http://www.exploit-db.com/exploits/15803/

Credit

This vulnerability was reported to the public by Matthew Bergin via 
Exploit-DB.

This document was written by Jared Allar.

Other Information

Date Public:			2010-12-21
Date First Published:		2010-12-22
Date Last Updated:		2010-12-22
CERT Advisory:	 
CVE-ID(s):	 
NVD-ID(s):	 
US-CERT Technical Alerts:	 
Severity Metric:		1.77
Document Revision:		8

If you have feedback, comments, or additional information about this 
vulnerability, please send us email.

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