Vulnerabilities in .NET Framework Could Allow Remote Code Execution (MS13-082)

ITS Advisory Number: 
2013-096
Date(s) Issued: 
Tuesday, October 8, 2013
Subject: 
Vulnerabilities in .NET Framework Could Allow Remote Code Execution (MS13-082)
Overview: 

Multiple vulnerabilities has been discovered in the Microsoft .NET Framework which could allow remote code execution. Microsoft.NET is a software framework for applications designed to run under Microsoft Windows. The vulnerability can be exploited if a user visits or is redirected to a specially crafted website.  Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 3.0
  • Microsoft .NET Framework 3.5
  • Microsoft .NET Framework 3.5.1
  • Microsoft .NET Framework 4
  • Microsoft .NET Framework 4.5
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
High
Description: 

Multiple vulnerabilities has been discovered in the Microsoft .NET Framework that could allow an attacker to take complete control of an affected system. The details of these vulnerabilities are as follows:

A remote code execution vulnerability exists in the way that affected components handle specially crafted OpenType fonts (OTF). The vulnerability could allow remote code execution if a user visits a website hosting an XAML Browser Application (XBAP) containing a specially crafted OTF file.

A denial of service vulnerability exists in the .NET Framework that could allow an attacker to cause a server or application to crash or become unresponsive.

A denial of service vulnerability exists in the .NET Framework that could allow an attacker to cause a server or application to crash or become unresponsive.

Successful exploitation of the first vulnerability could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 
  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Apply the principle of Least Privilege to all services.
  • Unless there is a business need to do otherwise, consider disabling XAML browser applications (XBAP) in Internet Explorer.
References: 
Microsoft:
http://technet.microsoft.com/en-us/security/bulletin/ms13-082
CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3128
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3860
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3861