Vulnerability identifier: #VU50185

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1772

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the CoreText component in macOS within the parsing of TTF fonts. A remote attacker can create a specially crafted text file, trick the victim into opening it, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 11.0 20A2411 - 11.1 20C69, 10.15 19A583 - 10.15.7 19H15, 10.14 18A391 - 10.14.6 18G84, 10.13 17A365 - 10.13.6 17G66, 10.12.4 16E195 - 10.12.6 16G1114, 10.3 7B85

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External links
http://support.apple.com/en-us/HT212147
http://www.zerodayinitiative.com/advisories/ZDI-21-758/

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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.