#VU47936 Time-of-check Time-of-use (TOCTOU) Race Condition in Antivirus for Mac - CVE-2020-27014

Vulnerability identifier: #VU47936

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-27014

CWE-ID: CWE-367

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Antivirus for Mac
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Trend Micro

Description

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

The vulnerability exists due to the lack of proper locking when performing operations on an object within the KERedirect kext. A local administrator can escalate privileges and execute arbitrary code in the context of the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Antivirus for Mac: 2020 (v10.x)

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-1285/
https://helpcenter.trendmicro.com/en-us/article/TMKA-09974

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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.