| CVE-2021-21284 | Date: (C)2021-02-03 (M)2023-12-22 |
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.
CVSS Score and Metrics +CVSS Score and Metrics -| CVSS V3 Severity: | CVSS V2 Severity: |
| CVSS Score : 6.8 | CVSS Score : 2.7 |
| Exploit Score: 2.3 | Exploit Score: 5.1 |
| Impact Score: 4.0 | Impact Score: 2.9 |
| |
| CVSS V3 Metrics: | CVSS V2 Metrics: |
| Attack Vector: ADJACENT_NETWORK | Access Vector: ADJACENT_NETWORK |
| Attack Complexity: LOW | Access Complexity: LOW |
| Privileges Required: LOW | Authentication: SINGLE |
| User Interaction: NONE | Confidentiality: NONE |
| Scope: CHANGED | Integrity: PARTIAL |
| Confidentiality: NONE | Availability: NONE |
| Integrity: HIGH | |
| Availability: NONE | |
| | |
