Malicious Code Vulnerability in coremsft Package - Exfiltration of Host Information
Summary
MAL-2025-192302: Malicious code in coremsft (PyPI). Affects coremsft versions 0.1 – 0.2. No fix is published. How to fix ↓
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Background
The coremsft package, available on PyPI, is designed for specific functionalities related to Microsoft technologies. However, it has been identified as containing malicious code that serves no legitimate purpose other than to exfiltrate sensitive information from the host system. This vulnerability poses a risk to users who install the package, as it can compromise their privacy and security.
Vulnerability Detail
The vulnerability originates from the coremsft package, which overrides the install command in its setup.py file to execute malicious code during installation. This code is designed to exfiltrate basic information about the host, such as the IP address and username. The implications of this vulnerability are significant, as it can lead to unauthorized access to sensitive data, making it a potential target for attackers. The package has been categorized under PROBABLY_PENTEST, indicating that while it may appear to be a penetration testing tool, it is actually harmful.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
pip uninstall coremsftIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a workaround, users can avoid installing the coremsft package altogether. If it has already been installed, it is recommended to remove it using the command: 'pip uninstall coremsft'. Additionally, users can utilize tools like Vulert to monitor their applications for vulnerabilities without needing to access the code directly.
Conclusion
The coremsft package has been identified as containing malicious code that exfiltrates sensitive information from the host system. Users are advised to uninstall the package immediately and monitor for any updates or patches. Utilizing tools like Vulert can help in identifying vulnerabilities in open-source software without direct access to the code.
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FAQ
The coremsft package is a Python package available on PyPI, intended for functionalities related to Microsoft technologies. However, it has been found to contain malicious code.
The malicious code in the coremsft package exfiltrates basic information such as the host's IP address and username.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If you have installed the coremsft package, you should uninstall it immediately using the command: 'pip uninstall coremsft'.
As of now, there is no patched version of the coremsft package available. It is recommended to monitor the package for any updates.
