Rewterz Threat Advisory –CVE-2021-36928 – Microsoft Edge Privilege Escalation Vulnerability

Severity

High

Analysis Summary

CVE-2021-36928

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Edge. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within Edge Installer. By creating a directory junction, an attacker can abuse Edge Installer to delete a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Impact

• Privilege Escalation
• Code Execution

Affected Vendors

Microsoft

Affected Products

• Microsoft Edge

Remediation

Microsoft has issued an update to correct this vulnerability. More details can be found at:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36928