QID 352873

Date Published: 2021-11-18

QID 352873: Amazon Linux Security Advisory for docker : ALAS-2021-1550

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. (
( CVE-2021-21284) a flaw was found in docker.
Pulling an intentionally malformed docker image manifest could lead to a crash of the `dockerd` daemon, resulting in a denial of service.
The highest threat from this vulnerability is to system availability. (
( CVE-2021-21285)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as High - 6.8 severity.
  • CVSS V2 rated as Low - 2.7 severity.
    • Solution
    Please refer to Amazon advisory: ALAS-2021-1550 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352873

    CVE-2021-21285 | CVE-2021-21284 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1550 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1550.html
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