#VU55531 Permissions, Privileges, and Access Controls in Parallels Desktop - CVE-2021-34856

Vulnerability identifier: #VU55531

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-2021-34856

CWE-ID: CWE-264

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 memory corruption condition in the virtio-gpu virtual device. A local administrator can escalate privileges and execute arbitrary code in the context of the hypervisor. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Parallels Desktop: before 16.5.1

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External links
https://www.zerodayinitiative.com/advisories/ZDI-21-938/
https://kb.parallels.com/125013

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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.