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GHSA-7638-r9r3-rmjj
No affected components available
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.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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