Multiple Vulnerabilities in Microsoft Edge Could Allow for Arbitrary Code Execution

ITS Advisory Number: 
2020-134
Date(s) Issued: 
Thursday, September 24, 2020
Subject: 
Multiple Vulnerabilities in Microsoft Edge Could Allow for Arbitrary Code Execution
Overview: 

Multiple vulnerabilities have been discovered in Microsoft Edge, the most severe of which could allow for arbitrary code execution. Microsoft Edge is a web browser used to access the Internet. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. 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 no reports of these vulnerabilities being exploited in the wild.

 

Systems Affected: 
  • Microsoft Edge versions prior to 85.0.564.63

RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Microsoft Edge, the most severe of which could allow for arbitrary code execution. These vulnerabilities can be exploited if a user visits, or is redirected to, a specially crafted web page. Details of the vulnerabilities are as follows: 

  • Out of bounds read in storage (CVE-2020-15960)

  • Insufficient policy enforcement in extensions (CVE-2020-15961)

  • Insufficient policy enforcement in serial (CVE-2020-15962)

  • Insufficient policy enforcement in extensions (CVE-2020-15963)

  • Out of bounds write in V8 (CVE-2020-15965)

  • Insufficient policy enforcement in extensions (CVE-2020-15966)

  • Insufficient data validation in media (CVE-2020-15964) 

Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. 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 stable channel updates provided by Microsoft to vulnerable systems.

  • Run all software as a non-privileged user (one without administrative rights) to diminish the effects of a successful attack.

  • Remind all users not to visit untrusted websites or follow links provided by unknown or untrusted sources.

  • Inform and educate users regarding 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.