Amazon Linux 2 Security Advisory: ALASDOCKER-2021-001
Advisory Release Date: 2021-10-19 18:50 Pacific
Advisory Updated Date: 2021-11-18 21:30 Pacific
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)
Affected Packages:
docker
Note:
This advisory is applicable to Amazon Linux 2 - Docker Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update docker to update your system.
aarch64:
docker-20.10.4-1.amzn2.aarch64
docker-debuginfo-20.10.4-1.amzn2.aarch64
src:
docker-20.10.4-1.amzn2.src
x86_64:
docker-20.10.4-1.amzn2.x86_64
docker-debuginfo-20.10.4-1.amzn2.x86_64