Malicious Code Injection in outstanding_lemur_z3n Package
Summary
MAL-2025-95814: Malicious code in outstanding_lemur_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The outstanding_lemur_z3n package is part of the npm ecosystem and is associated with the tea.xyz token reward campaign. This package is designed to facilitate the automatic generation and publication of derivative packages, which can inflate developer reputation scores. However, it has been identified as containing malicious code that compromises its integrity and the security of the npm registry.
Vulnerability Detail
The vulnerability in the outstanding_lemur_z3n package stems from its malicious payload that modifies the package.json file. It removes private flags, alters version numbers, and generates random package names, which leads to the continuous republishing of these variants. This behavior not only pollutes the npm registry but also poses a risk to developers who may unknowingly use these compromised packages, potentially leading to security breaches in their applications.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall outstanding_lemur_z3nIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, you can remove the outstanding_lemur_z3n package from your project by executing the following command: npm uninstall outstanding_lemur_z3n. This will prevent the execution of any malicious code associated with this package until a fix is applied.
Conclusion
The outstanding_lemur_z3n package has been identified as containing malicious code that compromises the security of the npm ecosystem. It is crucial for developers to take immediate action by updating or uninstalling the package to safeguard their applications. Utilizing tools like Vulert can help in monitoring and managing open-source vulnerabilities effectively.
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FAQ
The outstanding_lemur_z3n package is an npm package that is part of a token reward campaign, designed to generate and publish derivative packages.
The malicious code modifies your package.json file, removes private flags, and republishes variants, which can lead to security vulnerabilities in your application.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check if your application is affected by visiting the Vulert playground at Vulert Scanner.
If you cannot update the package, it is advisable to uninstall it and look for alternative packages that provide similar functionality without the security risks.
To prevent similar vulnerabilities, regularly monitor your dependencies for updates, use tools like Vulert for real-time alerts, and review package integrity before installation.
