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Category:   Application (Generic)  >   .NET Vendors:   Microsoft
Microsoft .NET Flaws Let Remote Users Execute Arbitrary Code, Obtain Potentially Sensitive Information, and Bypass Security Restrictions
SecurityTracker Alert ID:  1027753
SecurityTracker URL:  http://securitytracker.com/id/1027753
CVE Reference:   CVE-2012-1895, CVE-2012-1896, CVE-2012-2519, CVE-2012-4776, CVE-2012-4777   (Links to External Site)
Date:  Nov 13 2012
Impact:   Disclosure of system information, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4.0, 4.5
Description:   Several vulnerabilities were reported in Microsoft .NET. A remote user can cause arbitrary code to be executed on the target user's system. A remote user can obtain potentially sensitive information. A remote user can bypass security restrictions.

The .NET Framework does not properly validate the permissions of certain objects performing reflection [CVE-2012-1895]. A remote user can create a specially crafted a specially crafted XAML browser application (XBAP) that, when loaded by the target user, will execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

A remote user can create a specially crafted a specially crafted XBAP that, when loaded by the target user, will bypass Code Access Security (CAS) restrictions to obtain potentially sensitive information [CVE-2012-1896].

A remote user can create a legitimate .NET application built with ADO.NET that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, when the target user opens the .NET application, the specially crafted DLL will execute [CVE-2012-2519].

The .Net Framework does not properly validate retrieved default web proxy settings [CVE-2012-4776]. A remote user with the ability to conduct a man-in-the-middle attack can spoof the contents or the location of a proxy auto configuration (PAC) file to inject code into the currently running application, bypassing Code Access Security (CAS) restrictions.

The software does not properly validate permissions of objects involved with Windows Presentation Foundation (WPF) reflection [CVE-2012-4777]. A remote user can obtain the privileges of a logged in user. A Windows .NET Framework application can bypass CAS restrictions.

James Forshaw of Context Information Security reported four of these vulnerabilities.

Impact:   A remote user can create a file that, when loaded by the target user, will execute arbitrary code on the target user's system.

A remote user can obtain potentially sensitive information.

A remote user can bypass security restrictions.

Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor's advisory.

The Microsoft advisory is available at:

http://technet.microsoft.com/en-us/security/bulletin/ms12-074

Vendor URL:  technet.microsoft.com/en-us/security/bulletin/ms12-074 (Links to External Site)
Cause:   Access control error
Underlying OS:   Windows (2003), Windows (2008), Windows (2012), Windows (7), Windows (Vista), Windows (XP)

Message History:   None.


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