Vulnerability identifier: #VU56813

Vulnerability risk: Critical

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: N/A

CWE-ID: CWE-939

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 compromise the affected system.

The vulnerability exists due to improper input validation in in macOS Finder when processing custom URI schemes, such as File:// or fIle://. A remote attacker can create a specially crafted file with inetloc extension, send it as an email attachment, trick the victim to open the email and execute arbitrary OS commands on the system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

macOS: 11.0 20A2411 - 11.6 20G165, 10.15 19A583 - 10.15.7 19H1417, 10.14 18A391 - 10.14.6 18G9323

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External links
http://ssd-disclosure.com/ssd-advisory-macos-finder-rce/

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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?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.