#VU45772 Out-of-bounds write in Parallels Desktop - CVE-2020-17399

Vulnerability identifier: #VU45772

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-17399

CWE-ID: CWE-787

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 boundary error when processing untrusted input within the prl_hypervisor kext. A local user can run a specially crafted program to trigger out-of-bounds write and execute arbitrary code in the context of the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Parallels Desktop: 15.0.0 (46967) - 15.1.4 (47270)

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-1017/
https://kb.parallels.com/en/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.