Vulnerabilities in .NET Framework Could Allow Elevation of Privilege (MS15-101)

ITS Advisory Number: 
2015-112
Date(s) Issued: 
Tuesday, September 8, 2015
Subject: 
Vulnerabilities in .NET Framework Could Allow Elevation of Privilege (MS15-101)
Overview: 

Multiple vulnerabilities have been discovered in the Microsoft .NET Framework which could allow Elevation of Privilege. Microsoft.NET is a software framework for applications designed to run under Microsoft Windows. The vulnerability can be exploited if user runs a specially crafted .NET 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
  • Microsoft .NET Framework 4.6
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 Elevation of Privilege Vulnerability - CVE-2015-2504
  • A denial of service vulnerability exists that is caused when .NET fails to properly handle certain specially crafted requests - CVE-2015-2526
  • 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: 
  • After appropriate testing, apply appropriate patches provided by Microsoft to vulnerable systems.
  • 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.