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AUSCERT External Security Bulletin Redistribution
ESB-2013.0191
Vulnerability in .NET Framework Could Allow Elevation of
Privilege (2800277)
13 February 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft .NET Framework
Publisher: Microsoft
Operating System: Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8
Windows Server 2012
Impact/Access: Increased Privileges -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2013-0073
Original Bulletin:
http://technet.microsoft.com/en-us/security/bulletin/MS13-015
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Microsoft Security Bulletin MS13-015 - Important
Vulnerability in .NET Framework Could Allow Elevation of Privilege (2800277)
Published Date: February 12, 2013
Version: 1.0
General Information
Executive Summary
This security update resolves one privately reported vulnerability in the .NET
Framework. The vulnerability could allow elevation of privilege if a user views
a specially crafted webpage using a web browser that can run XAML Browser
Applications (XBAPs). The vulnerability could also be used by Windows .NET
applications to bypass Code Access Security (CAS) restrictions. An attacker who
successfully exploited this vulnerability could gain the same user rights as
the current user. Users whose accounts are configured to have fewer user rights
on the system could be less impacted than users who operate with administrative
user rights.
This security update is rated Important for Microsoft .NET Framework 2.0
Service Pack 2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1,
Microsoft .NET Framework 4, and Microsoft .NET Framework 4.5 on affected
editions of Microsoft Windows.
Affected Software
Microsoft .NET Framework 2.0 Service Pack 2 (KB2789643)
Microsoft .NET Framework 3.5.1 (KB2789644)
Microsoft .NET Framework 4 (KB2789642)
Microsoft .NET Framework 4.5 (KB2789648)
Vulnerability Information
WinForms Callback Elevation Vulnerability - CVE-2013-0073
An elevation of privilege vulnerability exists in the way that the .NET
Framework elevates the permissions of a callback function when a particular
Windows Forms object is created. An attacker who successfully exploited this
vulnerability could take complete control of an affected system. An attacker
could then install programs; view, change, or delete data; or create new
accounts with full user rights. Users whose accounts are configured to have
fewer user rights on the system could be less impacted than users who operate
with administrative user rights.
The vulnerability is the result of the .NET Framework improperly elevating
the permissions of a callback function when a particular WinForms object is
created.
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