#VU26129 Time-of-check Time-of-use (TOCTOU) Race Condition in Parallels Desktop - CVE-2020-8873

Vulnerability identifier: #VU26129

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-2020-8873

CWE-ID: N/A

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Parallels Desktop
Operating systems & Components / Operating system package or component

Vendor: Parallels

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

The vulnerability exists due to a lack of proper locking when performing operations on an object within the xHCI component. An local user can gain elevated privileges on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Parallels Desktop: before 15.1.3

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-294/

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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.