Vulnerability identifier: #VU52653

Vulnerability risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-30657

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a logic issue within the Gatekeeper checks. A remote attacker can craft a specially crafted payload that is not checked by Gatekeeper and bypasses File Quarantine and Application Notarization protections as well. As a result, a malicious binary can be executed on the system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 11.0 20A2411 - 11.2.3 20D91

---

External links
http://support.apple.com/en-us/HT212325
http://cedowens.medium.com/macos-gatekeeper-bypass-2021-edition-5256a2955508

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.