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Cumulative Security Update for Internet Explorer (MS16-104)

MS-ISAC ADVISORY NUMBER:

2016-130

DATE(S) ISSUED:

09/13/2016

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft Internet Explorer the most severe of which could allow remote code execution if a user views a specially crafted web page. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • Internet Explorer 9
  • Internet Explorer 10
  • Internet Explorer 11

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: MEDIUM
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: MEDIUM
Home Users:
LOW

TECHNICAL SUMMARY:

Microsoft Internet Explorer is prone to multiple vulnerabilities that could allow remote code execution. The vulnerabilities are as follows:

Four memory corruption vulnerabilities exist when Internet Explorer improperly accesses objects in memory (CVE-2016-3247, CVE-2016-3295, CVE-2016-3297, CVE-2016-3324)
Two information disclosure vulnerabilities exist when Internet Explorer improperly handles objects in memory (CVE-2016-3325, CVE-2016-3351)
One remote code execution vulnerability exists in the way that the Microsoft OLE Automation mechanism and the VBScript Scripting Engine in Internet Explorer access objects in memory (CVE-2016-3375)
One information disclosure vulnerability exists when Internet Explorer improperly handles cross-origin requests (CVE-2016-3291)
Successful exploitation of these vulnerabilities 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 then install programs; view, change, or delete data; or create new accounts with full user rights. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user 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 follow links provided by unknown or un-trusted sources.
Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments, especially those from un-trusted sources.
Apply the principle of Least Privilege to all systems and services.

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