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{"bugzilla": {"description": "docker: access to remapped root allows privilege escalation to real root", "id": "1924740", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1924740"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-732", "details": ["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.", "A flaw was found in the `userns-remap` feature of Docker. The root user in the remapped namespace can modify files under /var/lib/docker/<remapping>, leading to possible privilege escalation to the root user in the host. The highest threat from this vulnerability is to data integrity."], "name": "CVE-2021-21284", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "docker", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2021-02-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21284\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21284\nhttps://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"], "threat_severity": "Moderate", "upstream_fix": "docker 19.03.15, docker 20.10.3"}