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CVE-2021-21284

CVE information

Published

3 years ago

Last Modified

1 year ago

CVSSv2.0 Severity

Low

CVSSv3.1 Severity

Medium

Impact Analysis

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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/<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..

CVSSv2.0 Score

Severity
Low
Base Score
2.7/10
Exploit Score
5.1/10
Access Vector
Adjacent_network
Access Complexity
Low
Authentication Required
Single
Impact Score
2.9/10
Confidentiality Impact
None
Availability Impact
None
Integrity Impact
Partial

CVSSv3.1 Score

Severity
Medium
Base Score
6.8/10
Exploit Score
2.3/10
Access Vector
Adjacent_network
Access Complexity
Low
Privileges Required
Low
Impact Score
4/10
Confidentiality Impact
None
Availability Impact
None
Integrity Impact
High
Scope
Changed
User Interaction
None

Products Affected

CPE Affected Vulnerable Excluding Edit
cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*
  Yes
20.0.0 20.10.3
cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*
  Yes
- 19.03.15
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  Yes
- -
cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*
  Yes
11.0.0 -

References