Multiple Vulnerabilities in Microsoft Office and Outlook Could Allow for Remote Code Execution

ITS Advisory Number: 
2017-072
Date(s) Issued: 
Friday, July 28, 2017
Subject: 
Multiple Vulnerabilities in Microsoft Office and Outlook Could Allow for Remote Code Execution
Overview: 

Multiple vulnerabilities have been discovered in Microsoft Office and Outlook, the most severe of which could allow for remote code execution. Microsoft Office is a suite of applications and services, most notably packaged with Microsoft Word, Excel and PowerPoint. Microsoft Outlook is a personal information manager mainly used for email services. Successful exploitation of the most severe of these vulnerabilities could result in the attacker gaining control of the affected system. Depending on the privileges associated with this application, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.

Systems Affected: 
  • Microsoft Office 2010 Click-to-Run (C2R) for 32 & 64 bit editions

  • Microsoft Office 2013 Click-to-Run (C2R) for 32 & 64 bit editions

  • Microsoft Office 2016 Click-to-Run (C2R) for 32 & 64 bit editions

  • Microsoft Outlook 2007 Service Pack 3

  • Microsoft Outlook 2010 Service Pack 2 for 32 & 64 bit editions

  • Microsoft Outlook 2013 RT Service Pack 1

  • Microsoft Outlook 2013 Service Pack 1 for 32 & 64 bit editions

  • Microsoft Outlook 2016 for 32 & 64 bit editions

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 have been discovered in Microsoft Office and Outlook, the most severe of which could allow for remote code execution. These vulnerabilities can be exploited if a user open a specially crafted file with an affected version of Microsoft Outlook. An attacker could also provide a specially crafted document file designed to exploit the vulnerability, and then convince a user to open the document file and interact with the document by clicking a specific cell. Details of the vulnerabilities are as follows:

A security feature bypass vulnerability exists when Microsoft Office Outlook improperly handles input (CVE-2017-8571).

An information disclosure vulnerability exists when Microsoft Office improperly discloses the contents of its memory (CVE-2017-8572).

A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially crafted email messages (CVE-2017-8663).

Successful exploitation of the most severe of these vulnerabilities could result in the attacker gaining control of the affected system. Depending on the privileges associated with this application, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.

Actions: 
  • After appropriate testing, immediately apply patches provided by Microsoft to vulnerable systems.

  • 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 websites or follow links provided by unknown or untrusted sources.

  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from untrusted sources.

  • Apply the Principle of Least Privilege to all systems and services.