PT-2021-19308 · Parallels · Parallels Desktop

Reno Robert · Published 2021-04-21 · Updated 2021-05-06 · CVE-2021-31428

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Parallels Desktop version 15.1.5-47309

Description This issue allows local attackers to escalate privileges on affected installations. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this issue. The specific flaw exists within the IDE 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 heap-based buffer. An attacker can leverage this issue to escalate privileges and execute arbitrary code in the context of the hypervisor.

Recommendations For Parallels Desktop version 15.1.5-47309, consider disabling the IDE virtual device as a temporary workaround until a patch is available. Restrict access to high-privileged code on the target guest system to minimize the risk of exploitation. Avoid using the vulnerable IDE virtual device until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2021-31428

ZDI-21-436

Affected Products

Parallels Desktop

References · 4

• https://zerodayinitiative.com/advisories/ZDI-21-436 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31428 · Vendor Advisory
• https://kb.parallels.com/en/125013 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31428 · Security Note