PT-2020-12207 · Gnu · Grub2-Bhyve

Reno Robert · Published 2020-03-14 · Updated 2021-07-21 · CVE-2020-10565

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions grub2-bhyve versions prior to revision 525916 2020-02-12

Description The issue allows an untrusted guest to perform arbitrary read or write operations in the context of the grub-bhyve process, resulting in code execution as root on the host OS. This is due to the lack of validation of the address provided as part of a memrw command by a guest through a grub2.cfg file.

Recommendations For versions prior to revision 525916 2020-02-12, update to a version after revision 525916 2020-02-12 to resolve the issue. As a temporary workaround, consider restricting access to the grub2.cfg file to minimize the risk of exploitation.

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2020-10565

Affected Products

Grub2-Bhyve

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2020-10565 · Security Note
• https://osv.dev/vulnerability/CVE-2020-10565 · Vendor Advisory
• https://svnweb.freebsd.org/ports?view=revision&revision=525916 · Vendor Advisory
• https://github.com/renorobert/grub-bhyve-bugs · Note
• https://t.me/cybersecuritytechnologies/1609 · Telegram Post
• https://t.me/cvenotify/1686 · Telegram Post