CVE-2021-21284

privilege escalation in Moby

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using "--userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/<remapping>" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.

En Docker versiones anteriores a 9.03.15, 20.10.3, se presenta una vulnerabilidad que involucra la opción --userns-remap en la que un acceso a una root reasignada permite una escalada de privilegios a la root actual. Cuando se usa "--userns-remap", si el usuario root en el espacio de nombres reasignado tiene acceso al sistema de archivos del host, puede modificar archivos en "/var/lib/docker/(remapping)" que causa la escritura de archivos con privilegios extendidos. Las versiones 20.10.3 y 19.03.15 contienen parches que evitan una escalada de privilegios del usuario reasignado

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-02-02 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

References (8)

URL	Tag	Source
https://github.com/moby/moby/releases/tag/v19.03.15	Release Notes
https://github.com/moby/moby/releases/tag/v20.10.3	Release Notes
https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210226-0005	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c	2022-04-29
https://security.gentoo.org/glsa/202107-23	2022-04-29

URL	Date	SRC
https://docs.docker.com/engine/release-notes/#20103	2022-04-29
https://www.debian.org/security/2021/dsa-4865	2022-04-29

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Docker Search vendor "Docker"		Docker Search vendor "Docker" for product "Docker"				< 19.03.15 Search vendor "Docker" for product "Docker" and version " < 19.03.15"		-		Affected
Docker Search vendor "Docker"		Docker Search vendor "Docker" for product "Docker"				>= 20.0.0 < 20.10.3 Search vendor "Docker" for product "Docker" and version " >= 20.0.0 < 20.10.3"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Netapp Search vendor "Netapp"		E-series Santricity Os Controller Search vendor "Netapp" for product "E-series Santricity Os Controller"				>= 11.0.0 <= 11.60.3 Search vendor "Netapp" for product "E-series Santricity Os Controller" and version " >= 11.0.0 <= 11.60.3"		-		Affected