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AUSCERT External Security Bulletin Redistribution
ESB-2012.1080
Vulnerabilities in .NET Framework Could Allow Remote Code
Execution (2745030)
13 November 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: .NET Framework
Publisher: Microsoft
Operating System: Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2012-4777 CVE-2012-4776 CVE-2012-2519
CVE-2012-1896 CVE-2012-1895
Original Bulletin:
http://technet.microsoft.com/en-us/security/bulletin/ms12-074
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Microsoft Security Bulletin MS12-074 - Critical
Vulnerabilities in .NET Framework Could Allow Remote Code Execution (2745030)
Published Date: November 13, 2012 | Updated Date: Unspecified
Version: 1.0
General Information
Executive Summary
This security update resolves five privately reported vulnerabilities in the
.NET Framework. The most severe of these vulnerabilities could allow remote code
execution if an attacker convinces the user of a target system to use a
malicious proxy auto configuration file and then injects code into the currently
running application.
This security update is rated Critical 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. It is rated Important for
Microsoft .NET Framework 1.0 Service Pack 3 and Microsoft .NET Framework 1.1
Service Pack 1.
Affected Software
Microsoft .NET Framework 1.0 Service Pack 3
Microsoft .NET Framework 1.1 Service Pack 1
Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 4[1]
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4.5[2]
Microsoft .NET Framework 3.5
[1] .NET Framework 4 and .NET Framework 4 Client Profile affected. The .NET
Framework version 4 redistributable packages are available in two profiles:
.NET Framework 4 and .NET Framework 4 Client Profile. .NET Framework 4
Client Profile is a subset of .NET Framework 4. The vulnerability addressed
in this update affects both .NET Framework 4 and .NET Framework 4 Client
Profile. For more information, see the MSDN article, Installing the .NET
Framework.
[2] Customers running Microsoft .NET Framework 4.5 on Windows 8, Windows Server
2012, and Windows RT are not affected by this issue. The Windows 8 Client
and Windows Server 2012 General Availability Cumulative Update (KB2756872)
that was released on October 10, 2012 contains additional defense-in-depth
changes. Customers who have not already installed this update are
encouraged to do so as a defense-in-depth measure. See the More Information
section in Microsoft Knowledge Base Article 2745030 for more detail. For
download links and further information, see Microsoft Knowledge Base
Article 2756872. Note that this update contains non-security related
content.
Vulnerability Information
Reflection Bypass Vulnerability - CVE-2012-1895
An elevation of privilege vulnerability exists in the way that .NET Framework
validates the permissions of certain objects performing reflection. 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.
Code Access Security Info Disclosure Vulnerability - CVE-2012-1896
An information disclosure vulnerability exists in the Microsoft .NET Framework
due to the improper sanitization of output when a function is called from
partially trusted code. An attacker who successfully exploited this
vulnerability could obtain confidential information contained on the target
system.
.NET Framework Insecure Library Loading Vulnerability - CVE-2012-2519
A remote code execution vulnerability exists in the way that the Microsoft .NET
Framework handles the loading of DLL files. 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.
Web Proxy Auto-Discovery Vulnerability - CVE-2012-4776
A remote code execution vulnerability exists in the way that the .Net Framework
retrieves the default web proxy settings. 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.
WPF Reflection Optimization Vulnerability - CVE-2012-4777
An elevation of privilege vulnerability exists in the way that the .Net
Framework validates permissions for objects involved with reflection. 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.
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