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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
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AusCERT Security Bulletin Summary
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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
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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.
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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.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-116.shtml
ORIGINAL BULLETIN:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-025.asp
PATCHES:
http://microsoft.com/downloads/details.aspx?FamilyId=D415A4AC-E13A-4E8A-BE25-85E7DF686F61&displaylang=en
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