PT-2020-15846 · Freebsd+1 · Freebsd+1

Published 2020-09-03 · Updated 2020-09-11 · CVE-2020-24863

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions MidnightBSD versions prior to 1.2.7 MidnightBSD versions 1.3 through 2020-08-19 FreeBSD versions prior to 11.4

Description A memory corruption issue was found in the kernel function kern getfsstat() that allows an attacker to trigger an invalid free and crash the system via a crafted size value in conjunction with an invalid mode.

Recommendations For MidnightBSD versions prior to 1.2.7, update to version 1.2.7 or later. For MidnightBSD versions 1.3 through 2020-08-19, apply the necessary patches or updates to fix the issue. For FreeBSD versions prior to 11.4, update to version 11.4 or later.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2020-24863

Affected Products

Freebsd

Midnightbsd

References · 6

• 🔥 https://github.com/MidnightBSD/src/blob/1691c07ff4f27b97220a5d65e217341e477f4014/sys/kern/vfs_syscalls.c · Exploit
• 🔥 http://midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:01.txt · Exploit
• https://freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.asc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-24863 · Vendor Advisory
• https://midnightbsd.org/notes · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-24863 · Security Note