Vulnerability identifier: #VU55275

Vulnerability risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36928

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Microsoft Edge
Client/Desktop applications / Web browsers

Vendor: Microsoft

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists within Edge Installer. A local user can create a directory junction and force the Edge Installer to delete files with elevated privileges.

Successful exploitation of the vulnerability may allow a local user to execute arbitrary code with SYSTEM privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Edge: 91.0.864.37 - 91.0.864.71, 90.0.818.39 - 90.0.818.66, 89.0.774.45 - 89.0.774.77, 88.0.705.50 - 88.0.705.81, 87.0.664.41 - 87.0.664.75, 86.0.622.43 - 86.0.622.69, 84.0.522.40, 83.0.478.37, 79.0.309.71

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36928
http://www.zerodayinitiative.com/advisories/ZDI-21-936/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.