Vulnerabilities in .NET Framework Could Allow Remote Code Execution (MS14-057)

ITS Advisory Number: 
2014-087
Date(s) Issued: 
Tuesday, October 14, 2014
Subject: 
Vulnerabilities in .NET Framework Could Allow Remote Code Execution (MS14-057)
Overview: 

Multiple vulnerabilities have 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 user sends a specially crafted URI request containing international characters to a .NET web application. 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 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 3.5
  • Microsoft .NET Framework 3.5.1
  • Microsoft .NET Framework 4
  • Microsoft .NET Framework 4.5
  • Microsoft .NET Framework 4.5.1
  • Microsoft .NET Framework 4.5.2
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 .NET ClickOnce Elevation of Privilege Vulnerability - CVE-2014-4073
  • A remote code execution vulnerability exists in the way Microsoft .NET Framework improperly parses internationalized resource identifiers - CVE-2014-4121
  • A security feature bypass vulnerability exists in Microsoft .NET Framework that could allow an attacker to bypass the Address Space Layout Randomization (ASLR) security feature, which helps protect users from a broad class of vulnerabilities -CVE-2014-4122

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 install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 

We recommend the following actions be taken:

  • 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.
References: 

Microsoft:
http://technet.microsoft.com/en-us/security/bulletin/ms14-057

CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4073
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4121
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4122