Information Disclosure Vulnerability in Buildah: Access to Sensitive Environment Variables
Summary
CVE-2021-3602: An information disclosure flaw was found in Buildah, when building containers using chroot isolation. Affects golang-github-containers-buildah versions < a468ce0ffd347035d53ee0e26c205ef604097fb0. No fix is published. How to fix ↓
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Background
Buildah is a tool designed for building Open Container Initiative (OCI) and Docker container images. It allows users to create and manage container images without requiring a full container runtime. Buildah is particularly useful in CI/CD environments where automation and security are paramount. However, it has been found to have a vulnerability that can expose sensitive information during the container build process.
Vulnerability Detail
An information disclosure flaw exists in Buildah when building containers using chroot isolation. This vulnerability allows processes running in container builds, such as those executed by Dockerfile RUN commands, to access environment variables from parent and grandparent processes. In CI/CD environments, these environment variables may contain sensitive information, such as container registry credentials, which are intended to be used only by Buildah. The potential ramifications include unauthorized access to sensitive data, leading to security breaches and compromised systems.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, avoid passing sensitive environment variables to the container during the build process. Instead, consider using build secrets or other secure methods to manage sensitive information.
Conclusion
The information disclosure vulnerability in Buildah poses a significant risk in environments where sensitive data is handled. It is crucial to update to the latest version of Buildah to mitigate this risk. Additionally, employing workarounds can help protect sensitive information until an update can be applied.
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FAQ
The CVSS score for this vulnerability is 5.5, indicating a moderate level of severity.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without requiring any installation.
The vulnerability can lead to unauthorized access to sensitive information, such as credentials, which may result in security breaches and compromised systems.
Yes, the vulnerability is fixed in Buildah version 1.22.3+ds1-1 and later.
If an immediate update is not possible, avoid passing sensitive environment variables during the build process as a temporary workaround.
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