Vulnerability Details : CVE-2021-34857
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 Toolgate component. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13601.
Vulnerability category: Memory CorruptionExecute code
Products affected by CVE-2021-34857
- cpe:2.3:a:parallels:parallels_desktop:16.1.3:*:*:*:*:macos:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-34857
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 20 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-34857
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
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 | |
|
8.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
2.0
|
6.0
|
NIST |
CWE ids for CVE-2021-34857
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: zdi-disclosures@trendmicro.com (Primary)
References for CVE-2021-34857
-
https://kb.parallels.com/125013
Parallels Desktop Security UpdatesPatch;Vendor Advisory
-
https://www.zerodayinitiative.com/advisories/ZDI-21-940/
ZDI-21-940 | Zero Day InitiativeThird Party Advisory;VDB Entry
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