Vulnerability identifier: #VU28309

Vulnerability risk: Low

CVSSv3.1: 7.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2020-9856

CWE-ID: CWE-122

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the handling of Core Virtual Machine Service caches. A local user can pass specially crafted data to the applicatoin, trigger heap-based buffer overflow and execute arbitrary code on the target system with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 10.15.4 19E266

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External links
http://www.zerodayinitiative.com/advisories/ZDI-20-680/
http://support.apple.com/en-gb/HT211170

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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. However, a fully functional exploit for this vulnerability is available.