CVE-2021-3602: Infoleak
Impact When running processes using "chroot" isolation, the process being run can examine the environment variables of its immediate parent and grandparent processes (CVE-2021-3602). This isolation type is often used when running buildah in unprivileged containers, and it is often used to do so in CI/CD environments. If sensitive information is exposed to the original buildah process through its environment, that information will unintentionally be shared with child processes which it starts as part of handling RUN instructions or during buildah run. The commands that buildah is instructed to run can read that information if they choose to.
Patches Users should upgrade packages, or images which contain packages, to include version 1.21.3 or later.
Workarounds As a workaround, invoking buildah in a container under env -i to have it started with a reinitialized environment should prevent the leakage.
For more information If you have any questions or comments about this advisory: Open an issue in buildah Email us at the buildah general mailing list, or the podman security mailing list if it's sensitive.
Other sources
An information disclosure flaw was found in Buildah, when building containers using chroot isolation. Running processes in container builds (e.g. Dockerfile RUN commands) can access environment variables from parent and grandparent processes. When run in a container in a CI/CD environment, environment variables may include sensitive information that was shared with the container in order to be used only by Buildah itself (e.g. container registry credentials).
— Launchpad
An information disclosure vulnerability was found in buildah, when using buildah bud with chroot isolation. Dockerfile RUN commands executed during rootless buildah bud execution can read environment variables from the host, which may include sensitive information, such as container registry credentials.
— Red Hat
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the vulnerability ID for this Buildah flaw?
The vulnerability ID for this Buildah flaw is CVE-2021-3602.
What is the impact of the vulnerability?
The impact of the vulnerability is an information disclosure.
How does the vulnerability in Buildah occur?
The vulnerability in Buildah occurs when running processes using "chroot" isolation.
What is the severity of CVE-2021-3602?
The severity of CVE-2021-3602 is medium.
Which version of Buildah is affected by this vulnerability?
The versions affected by this vulnerability are 1.21.3, 1.19.9, 1.17.2, and 1.16.8.