South Carolina Information Sharing and Analysis Center
SC INFORMATION SHARING AND ANALYSIS CENTER BULLETIN
DATE ISSUED: 2/12/2013
SUBJECT: Vulnerability in .NET Framework Could Allow Elevation of Privilege
A vulnerability has been discovered in the Microsoft .NET Framework which could allow an attacker to take complete control of an affected system. Microsoft.NET is a software framework for applications designed to run under Microsoft Windows. This vulnerability can be exploited if a user visits or is redirected to a malicious web page or runs a specially crafted Microsoft.NET application.
Successful exploitation of this vulnerability could allow an attacker to obtain complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
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. Exploitation could occur if a user visits a specially crafted website that hosts malicious XBAP (Extensible Application Markup Language Browser Application) content using a web browser capable of instantiating XBAPs. Additionally, an attacker can exploit this issue by creating a specially crafted Windows .NET application to bypass Code AccessSecurity (CAS) restrictions.
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.
- Microsoft .NET Framework 2.0
- Microsoft .NET Framework 3.5 (except SP1)
- Microsoft .NET Framework 3.5.1
- Microsoft .NET Framework 4
- Microsoft .NET Framework 4.5 (except on Windows RT)
Large and medium government entities: High
Small government entities: High
Large and medium business entities: High
Small business entities: High
Home users: High
We recommend the following actions be taken:
- Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
- Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources. (Macintosh).
Please feel free to contact the SC ISAC if you have any questions or need any additional information.
The SC ISAC will provide amplifying information as it becomes available.
SC-ISAC Contact Information
SC ISAC Security Line: 803-896-1650
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Fax: +1 803-896-0375
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