Multiple vulnerabilities in Parallels Desktop

Published: 2022-02-21

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-34987 CVE-2021-34986
CWE-ID	CWE-264 CWE-367
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Parallels Desktop Operating systems & Components / Operating system package or component
Vendor

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU60722

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34987

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly impose security restrictions within the HDAudio virtual device, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Parallels Desktop: before 17.1.0 51516

External links

http://www.zerodayinitiative.com/advisories/ZDI-22-386/
http://kb.parallels.com/en/125013

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.

2) Time-of-check Time-of-use (TOCTOU) Race Condition

EUVDB-ID: #VU60723

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34986

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition