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

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

MS-ISAC ADVISORY NUMBER:

2017-069

DATE(S) ISSUED:

07/28/2017

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 Power Point. 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.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

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
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: HIGH
Home Users:
HIGH

TECHNICAL SUMMARY:

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 convinces 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.

RECOMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • 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 un-trusted websites or open attachments provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

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