QID 353063

Date Published: 2021-12-14

QID 353063: Amazon Linux Security Advisory for runc : ALAS2DOCKER-2021-009

Runc through 1.0.0-rc8, as used in docker through 19.03.2-ce and other products, allows apparmor restriction bypass because libcontainer/rootfs_linux.go incorrectly checks mount targets, and thus a malicious docker image can mount over a /proc directory. (
( CVE-2019-16884) a flaw was found in runc.
An attacker who controls the container image for two containers that share a volume can race volume mounts during container initialization, by adding a symlink to the rootfs that points to a directory on the volume.
The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (
( CVE-2019-19921)



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.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2DOCKER-2021-009 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353063

    CVE-2019-19921 | CVE-2019-16884 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2DOCKER-2021-009 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALASDOCKER-2021-009.html
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