Multiple Vulnerabilities in Microsoft Edge Could Allow for Arbitrary Code Execution

Summary

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

System Affected

• Microsoft Edge versions prior to 85.0.564.63

Risk

Government:

• Large and medium government entities: High
• Small government entities: Medium

Businesses:

• Large and medium government entities: High
  Small government entities: Medium

Home Users: Low

Technical Summary

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)

Recommendations

We recommend the following actions be taken:

• Apply the stable channel update 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 from un-trusted sources.
• Apply the Principle of Least Privilege to all systems and services.

References

Microsoft:

https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV200002

CVE:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15960
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15961
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15962
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15963
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15965
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15966
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15964

Reporting

We encourage recipients who discover signs of malicious cyber activity to contact us via the cyber incident report form by clicking here.