Vulnerability Monitor

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CVE-2021-21284

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.

Published

2021-02-02T18:15:11.827

Last Modified

2024-11-21T05:47:55.867

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.8 (MEDIUM)

CVSSv2 Vector

AV:A/AC:L/Au:S/C:N/I:P/A:N

  • Access Vector: ADJACENT_NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: NONE
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

5.1

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-22
  • Type: Primary
    CWE-22
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application docker docker < 19.03.15 Yes
Application docker docker < 20.10.3 Yes
Operating System debian debian_linux 10.0 Yes
Application netapp e-series_santricity_os_controller ≤ 11.60.3 Yes
References