PT-2021-19311 · Parallels · Parallels Desktop

Reno Robert · Published 2021-04-21 · Updated 2021-05-06 · CVE-2021-31431

Positive Technologies (AI Summary)

CVSS v3.1

6.0

Medium

Base vector

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

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

Description This issue allows local attackers to disclose sensitive information 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 user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other issues 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 the vulnerable device to minimize the risk of exploitation. Avoid using user-supplied data in the affected 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

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2021-31431

ZDI-21-439

Affected Products

Parallels Desktop

References · 5

• https://zerodayinitiative.com/advisories/ZDI-21-439 · Security Note
• https://kb.parallels.com/en/125013 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31431 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31431 · Security Note
• https://t.me/cvenotify/13926 · Telegram Post