AUSCERT External Security Bulletin Redistribution

                ESB-2003.0484 -- CIAC Bulletin Number N-116
 Flaw in Microsoft Windows Message Handling through Utility Manager Could
                        Enable Privilege Elevation
                               11 July 2003


        AusCERT Security Bulletin Summary

Product:                Utility Manager
Publisher:              CIAC
Operating System:       Microsoft Windows 2000
Impact:                 Increased Privileges
Access Required:        Existing Account

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                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
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                             INFORMATION BULLETIN

Flaw in Microsoft Windows Message Handling through Utility Manager Could 
Enable Privilege Elevation
                     [Microsoft Security Bulletin MS03-025]

July 10, 2003 17:00 GMT                                           Number N-116
PROBLEM:       A security vulnerability exists in the way that Utility Manager 
               handles Windows messages because the control that provides the 
               list of accessibility options to the user does not properly 
               validate Windows messages sent to it. It's possible for one 
               process in the interactive desktop to use a specific Windows 
               message to cause the Utility Manager process to execute a 
               callback function at the address of its choice. Because the 
               Utility Manager process runs at higher privileges than the 
               first process, this would provide the first process with a way 
               of exercising those higher privileges. 
SOFTWARE:      Microsoft Windows 2000 
DAMAGE:        An attacker who had the ability to log on to a system 
               interactively could potentially run a program that could send a 
               specially crafted Windows message upon the Utility Manager 
               process, causing it to take any action the attacker specified. 
               This would give the attacker complete control over the system. 
SOLUTION:      Apply patch as stated in Microsoft's security bulletin. 
VULNERABILITY  The risk is MEDIUM. The attack cannot be exploited remotely, 
ASSESSMENT:    and the attacker would have to have the ability to 
               interactively log on to the system. 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-116.shtml 
 ORIGINAL BULLETIN:                                                           

Version: 4.0 Business Edition


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