MS-ISAC CYBERSECURITY ADVISORIES

MS-ISAC ADVISORY NUMBER:
2016-101

DATE(S) ISSUED:
07/12/16

SUBJECT:
Cumulative Security Update for Microsoft Edge

OVERVIEW:


Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. Microsoft Edge replaced Internet Explorer as the default browser on Windows 10. 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.

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

SYSTEMS AFFECTED:
Windows 10
Windows 10 (Version 1511)

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:
Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. Details of these vulnerabilities are as follows:
  • A Security Feature Bypass exists when Microsoft Edge does not properly implement Address Space Layout Randomization (ASLR). (CVE-2016-3244)
  • Two Memory Corruption Vulnerabilities exists when Microsoft Edge improperly accesses objects in memory. (CVE-2016-3246, CVE-2016-3264)
  • Five Scripting Engine Memory Corruption Vulnerabilities exist in the way that the Chakra JavaScript engine renders when handling objects in memory in Microsoft Edge. (CVE-2016-3248, CVE-2016-3259, CVE-2016-3260, CVE-2016-3265, CVE-2016-3269)
  • A Scripting Engine Information Disclosure Vulnerability exists when VBScript improperly discloses the contents of its memory, which could provide an attacker with information to further compromise the user?s computer or data. (CVE-2016-3271)
  • A Microsoft Browser Information Disclosure Vulnerability exists when the Microsoft Browser XSS Filter does not properly validate content under specific conditions. (CVE-2016-3273)
  • A Microsoft Browser Spoofing Vulnerability exists when a Microsoft browser does not properly parse HTTP content. (CVE-2016-3274)
  • A Microsoft Browser Spoofing Vulnerability exists when the Microsoft Browser in reader mode does not properly parse HTML content. (CVE-2016-3276)
  • A Microsoft Browser Information Disclosure Vulnerability exists when the Microsoft Browser improperly handles objects in memory. (CVE-2016-3277)

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.

RECOMMENDATIONS:

We recommend the following actions be taken: