Vulnerability Details : CVE-2021-34987
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (49187). 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 HDAudio virtual device. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-14969.
Vulnerability category: OverflowExecute code
Products affected by CVE-2021-34987
- cpe:2.3:a:parallels:parallels_desktop:16.5.1:*:*:*:*:macos:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-34987
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 26 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-34987
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
8.2
|
HIGH | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
1.5
|
6.0
|
Zero Day Initiative | |
|
8.2
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
1.5
|
6.0
|
NIST |
CWE ids for CVE-2021-34987
-
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by: zdi-disclosures@trendmicro.com (Primary)
References for CVE-2021-34987
-
https://kb.parallels.com/en/125013
Parallels Desktop Security UpdatesVendor Advisory
-
https://www.zerodayinitiative.com/advisories/ZDI-22-386/
ZDI-22-386 | Zero Day InitiativeThird Party Advisory;VDB Entry
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