Full Report
The maintainers of the Python Package Index (PyPI) registry have announced a new feature that allows package developers to archive a project as part of efforts to improve supply chain security. "Maintainers can now archive a project to let users know that the project is not expected to receive any more updates," Facundo Tuesca, senior engineer at Trail of Bits, said. In doing so, the idea is to
Analysis Summary
# Best Practices: Managing Unmaintained Python Packages (PyPI Archival)
## Overview
These practices address the software supply chain security risks associated with using unmaintained Python packages from the Python Package Index (PyPI). The core guideline involves utilizing the new archival status feature to clearly signal when a package will no longer receive updates or security fixes, protecting downstream consumers from outdated or vulnerable dependencies.
## Key Recommendations
### Immediate Actions
1. **Inventory Critical Dependencies:** Conduct an immediate audit of all currently deployed applications relying on third-party Python packages to identify high-risk, unmaintained dependencies.
2. **Consult PyPI Status:** When evaluating new or existing dependencies, check their status on PyPI. If a project lacks recent updates or appears unmaintained, flag it for immediate review.
3. **Begin Documentation Updates:** For any package you maintain that is truly end-of-life, immediately update its project description to warn users clearly about its unmaintained status.
### Short-term Improvements (1-3 months)
1. **Final Release Preparation:** Before archiving a project, release one final version that explicitly includes a warning in the project description detailing that the project is archived and no further security fixes will be issued.
2. **Recommend Alternatives:** In the final release description of an archived package, recommend specific, currently maintained alternative packages that users should migrate to.
3. **Apply Archival Status:** Once the final warning release is deployed, utilize the PyPI feature to formally archive the project, signaling non-maintenance to the community.
4. **Establish Dependency Monitoring:** Implement Software Composition Analysis (SCA) tools that integrate with PyPI to automatically alert development teams when a dependency they use has officially been marked as archived.
### Long-term Strategy (3+ months)
1. **Develop Migration Roadmaps:** For all critically dependent, archived packages, create and execute formal migration roadmaps to transition to officially supported alternatives.
2. **Implement Policy for Maintenance:** Establish organizational policies requiring that all direct and transitive dependencies must either be actively maintained (tracked via version control commit frequency or PyPI archival status) or be securely vendored and patched internally.
3. **Explore Custom Statuses:** Stay informed about potential future PyPI features (such as other maintainer-controlled statuses) to further enhance communication regarding package health to consumers.
## Implementation Guidance
### For Small Organizations
- **Manual Review Focus:** Focus efforts on manually reviewing the top 10 critical direct dependencies for critical applications based on the archival notification.
- **Limit Dependencies:** Prioritize using only packages with significant community adoption or known corporate backing to minimize the risk of unmaintained dependencies.
### For Medium Organizations
- **Implement SCA Tooling:** Invest in and deploy an SCA tool configured to scan build pipelines and flag dependencies marked as archived on PyPI.
- **Establish 'Sunset' Policy:** Define a formal process for deprecating and replacing internal libraries that rely on unmaintained external components.
### For Large Enterprises
- **Automated Pipeline Enforcement:** Integrate security checks that prevent the deployment of builds containing packages explicitly marked as archived, treating them as critical security finding failures.
- **Quarantine Monitoring:** Establish a rapid response procedure to immediately review and quarantine/replace any package that PyPI administrators potentially quarantine due to malicious activity, ensuring adherence to proactive security measures.
- **Internal Repository Curation:** Utilize an artifact repository manager to proxy PyPI, allowing for central control, blacklisting of known archived or malicious packages, and promoting curated, vetted versions.
## Configuration Examples
*(No specific technical configuration files or commands were provided in the source text; the following reflects the actions required.)*
**Action for Maintainers (The Archival Process):**
1. **Update Description:** Modify the `setup.py` or `pyproject.toml` metadata, ensuring the primary project description clearly states: "WARNING: This project is archived and will not receive future updates or security patches. Please migrate to [Alternative Package Name]."
2. **Publish Final Version:** Build and upload a final version to PyPI including the updated metadata.
3. **Archive via PyPI Interface:** Navigate to the package management interface on PyPI and select the option to officially mark the project as "Archived."
## Compliance Alignment
The practices discussed align conceptually with the following security standards focused on supply chain risk management:
* **NIST SP 800-218 (SLSA Framework Context):** Identifying and eliminating unmaintained software components directly addresses the requirement to ensure the integrity of the software supply chain.
* **ISO/IEC 27034 (Application Security):** Specifically sections related to managing security requirements for third-party software components.
* **CIS Critical Security Controls (Control 10 - Continuous Vulnerability Management):** Identifying and remediating dependencies that are no longer patched addresses this principle.
## Common Pitfalls to Avoid
- **Assuming Silence Means Security:** Do not assume a package that hasn't updated recently is safe; silence often means it is abandoned and vulnerable to future exploitation.
- **Installing Archived Packages Blindly:** Never install an archived package without first confirming you have a patching strategy or a concrete migration plan, as security advisories will not be addressed by the original author.
- **Ignoring PyPI Quarantine Status:** Neglecting to monitor or react to packages that PyPI administrators quarantine (marking as suspicious/malicious) can lead to immediate compromise.
## Resources
- **PyPI Official Blog:** Monitor for updates regarding new features like archival status and quarantine protocols (e.g., announcements regarding PyPI security enhancements).
- **Software Composition Analysis (SCA) Tools:** Utilizing commercial or open-source tools capable of checking dependency metadata against official registry risk indicators.