CVE-2021-29626

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In FreeBSD 13.0-STABLE before n245117, 12.2-STABLE before r369551, 11.4-STABLE before r369559, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, copy-on-write logic failed to invalidate shared memory page mappings between multiple processes allowing an unprivileged process to maintain a mapping after it is freed, allowing the process to read private data belonging to other processes or the kernel.

En FreeBSD versiones 13.0-STABLE anteriores a n245117, versiones 12.2-STABLE anteriores a r369551, versiones 11.4-STABLE anteriores a r369559, versiones 13.0-RC5 anteriores a p1, versiones 12.2-RELEASE anteriores a p6 y versiones 11.4-RELEASE anteriores a p9, la lógica de copy-on-write fallaba al invalidar las asignaciones de páginas de memoria compartida entre múltiples procesos, permitiendo que un proceso sin privilegios mantuviera una asignación después de ser liberada, permitiendo que el proceso leyera datos privados pertenecientes a otros procesos o al kernel

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-30 CVE Reserved
2021-04-07 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (2)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20210423-0008	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.FreeBSD.org/advisories/FreeBSD-SA-21:08.vm.asc	2022-05-27

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"				< 11.4 Search vendor "Freebsd" for product "Freebsd" and version " < 11.4"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				>= 12.0 < 12.2 Search vendor "Freebsd" for product "Freebsd" and version " >= 12.0 < 12.2"		-		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"		beta1		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"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		p2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		p3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		p4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		p5		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		rc1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4"		rc2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2"		p2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		beta1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		beta2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		beta3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		beta4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		rc1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		rc2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		rc3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		rc4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				13.0 Search vendor "Freebsd" for product "Freebsd" and version "13.0"		rc5		Affected