Buffer overflow in Parallels Desktop
CVE-2021-34856
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.3 (49160). An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the virtio-gpu virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13581.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Parallels Desktop — versions 16.1.3 (49160)
- Parallels Parallels_desktop — versions 16.1.3
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (Patch, x_refsource_MISC, Vendor Advisory)
- zdi-disclosures@trendmicro.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-34856?
- CVE-2021-34856 is a high-severity vulnerability in Parallels Desktop, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2021-10-25.
- How severe is CVE-2021-34856?
- High severity. CVSS v3 base score is 8.8 out of 10.