Vulnerability in Schannel Could Allow Remote Code Execution (MS14-066)

ITS Advisory Number: 
2014-096
Date(s) Issued: 
Tuesday, November 11, 2014
Subject: 
Vulnerability in Schannel Could Allow Remote Code Execution (MS14-066)
Overview: 

Microsoft has released a patch that fixes a critical remote code execution vulnerability in the Microsoft Secure Channel (SChannel) security package in Windows. The Microsoft Secure Channel package helps implement both the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) standard authentication protocols. These components are used to implement secure communications in support of several common internet and network applications, such as web browsing.

Successful exploitation could result in the attacker gaining the same user rights as the current 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 Windows Vista and above
Microsoft Server 2003 and above
Microsoft Server Core Installation options

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: 

Microsoft has released a patch that fixes a critical remote code execution vulnerability in the Microsoft Secure Channel (SChannel) security package in Windows. This vulnerability exists due to the improper processing of specially crafted packets.

Successful exploitation could result in the attacker gaining the same user rights as the current 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 patch 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.
Remind users not to open email attachments from unknown users or suspicious emails from trusted sources.