CVE-2020-7460

FreeBSD Kernel sendmsg System Call Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In FreeBSD 12.1-STABLE before r363918, 12.1-RELEASE before p8, 11.4-STABLE before r363919, 11.4-RELEASE before p2, and 11.3-RELEASE before p12, the sendmsg system call in the compat32 subsystem on 64-bit platforms has a time-of-check to time-of-use vulnerability allowing a mailcious userspace program to modify control message headers after they were validation.

En FreeBSD versiones 12.1-ESTABLE anteriores a r363918, versiones 12.1-RELEASE anteriores a p8, versiones 11.4-ESTABLE anteriores a r363919, versiones 11.4-RELEASE anteriores a p2 y versiones 11.3-RELEASE anteriores a p12, la llamada al sistema sendmsg en el subsistema compat32 en plataformas de 64 bits presenta una vulnerabilidad de tipo time-of-check to time-of-use permitiendo a un programa de espacio de usuario malicioso modificar encabezados de mensajes de control después de que fueron comprobados

This vulnerability allows local attackers to escalate privileges on affected installations of FreeBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of arguments to the sendmsg system call. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.

*Credits: m00nbsd

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-21 CVE Reserved
2020-08-06 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

CAPEC

References (3)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20200821-0005	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-949	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:23.sendmsg.asc	2022-07-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p10		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p11		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p5		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p6		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p7		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p8		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.3 Search vendor "Freebsd" for product "Freebsd" and version "11.3"		p9		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p6		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		p7		Affected