CVE-2021-21284

Severity CVSS v4.0:

Pending analysis

Type:

CWE-22 Path Traversal

Publication date:

02/02/2021

Last modified:

29/04/2022

Description

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/" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.

Impact

Vector 3.x

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x

6.80

Severity 3.x

MEDIUM

Vector 2.0

AV:A/AC:L/Au:S/C:N/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 2.70 LOW
Vector: AV:A/AC:L/Au:S/C:N/I:P/A:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): None
Integrity (I): Physical
Availability (A): None

Base Score 2.0

2.70

Severity 2.0

LOW

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:docker:docker::::::::		19.03.15 (excluding)
cpe:2.3:a:docker:docker::::::::	20.0.0 (including)	20.10.3 (excluding)
cpe:2.3:o:debian:debian_linux:10.0:::::::*
cpe:2.3:a:netapp:e-series_santricity_os_controller::::::::	11.0.0 (including)	11.60.3 (including)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-21284

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools