Vulnerability CVE-2020-24385

Vulnerability Name:

CVE-2020-24385 (CCN-187833)

Assigned:

2020-08-19

Published:

2020-08-19

Updated:

2020-09-11

Summary:

In MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7, a NULL pointer dereference was found in the Linux emulation layer that allows attackers to crash the running kernel. During binary interaction, td->td_emuldata in sys/compat/linux/linux_emul.h is not getting initialized and returns NULL from em_find().

CVSS v3 Severity:

5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-476

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2020-24385

Source: CCN
Type: MIDNIGHTBSD-SA-20:02
Null Pointer Dereference Vulnerability in MidnightBSD

Source: CONFIRM
Type: Vendor Advisory
http://www.midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:02.txt

Source: XF
Type: UNKNOWN
midnightbsd-cve202024385-dos(187833)

Source: CCN
Type: FreeBSD-EN-20:18
getfsstat compatibility system call panic

Source: MISC
Type: Release Notes, Vendor Advisory
https://www.midnightbsd.org/notes/

Vulnerable Configuration:

Configuration 1:

cpe:/a:midnightbsd:midnightbsd:*:*:*:*:*:*:*:* (Version < 1.2.6)

OR cpe:/a:midnightbsd:midnightbsd:*:*:*:*:*:*:*:* (Version >= 1.3 and <= 2020-08-19)

Configuration 2:

cpe:/o:freebsd:freebsd:*:*:*:*:*:*:*:* (Version <= 7.0)

Configuration CCN 1:

cpe:/o:freebsd:freebsd:6.0:-:*:*:*:*:*:*

Denotes that component is vulnerable

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