Vulnerability CVE-2020-24863
Published: 2020-09-03

Description:
A memory corruption vulnerability was found in the kernel function kern_getfsstat in MidnightBSD before 1.2.7 and 1.3 through 2020-08-19, and FreeBSD through 11.4, that allows an attacker to trigger an invalid free and crash the system via a crafted size value in conjunction with an invalid mode.

Type:

CWE-787

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Midnightbsd -> Midnightbsd 
Freebsd -> Freebsd 

 References:
http://www.midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:01.txt
https://github.com/MidnightBSD/src/blob/1691c07ff4f27b97220a5d65e217341e477f4014/sys/kern/vfs_syscalls.c
https://www.freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.asc
https://www.midnightbsd.org/notes/
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