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CVE-2025-4953: Podman Flaw Allows Unauthorized File Creation in Temporary Build Context Directory

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Overview

The vulnerability identified as CVE-2025-4953 represents a significant flaw found in Podman, a popular open-source project that allows developers to manage pods, containers, and container images. This critical vulnerability can potentially affect any entity utilizing Podman for their containerization needs. The flaw allows for the creation of files within containers that can pop up in the temporary build context directory on the host, making these files accessible and leading to potential system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-4953
Severity: High (7.4)
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Impact: Unauthorized file creation within containers, leading to potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Podman | All versions prior to the patch

How the Exploit Works

This vulnerability stems from a flaw in Podman’s handling of the RUN –mount=type=bind commands during a build. Data written to these mounts is not discarded as expected. Consequently, files created within the container can appear in the temporary build context directory on the host, making them accessible without the proper authorization. An attacker with access to the host could exploit this flaw to access sensitive data or compromise the system.

Conceptual Example Code

While there is no direct code to demonstrate this vulnerability due to its nature, the issue occurs within the context of a Podman build process. The following is a conceptual example of a Podman command that could potentially create a vulnerable condition:

podman build --mount=type=bind,source="$(pwd)"/target-dir,target=/app/my-dir .

In this example, any file written to /app/my-dir during the build process would appear in target-dir on the host, potentially making it accessible to unauthorized users.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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