Predictable Filename Generation in Zipline

Executive Summary

Zipline before 4.0.2 has a predictable filename vulnerability caused by a weak random number generator (Math.random). Attackers can guess filenames by recovering the generator's state after observing five consecutive gfycat-style filenames. This allows prediction of past and future filenames until the server restarts, potentially exposing private uploads.

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Detection Guidance

This vulnerability involves predictable filenames generated by Math.random in Zipline before 4.0.2. Detection requires checking if your Zipline instance is running a vulnerable version and monitoring for unusual filename patterns or unauthorized access to uploads.

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Impact Analysis

If you use Zipline before 4.0.2, attackers could access your private uploads by predicting filenames. This could lead to data leaks, unauthorized access to sensitive files, or exposure of confidential information stored in uploads.

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Compliance Impact

This vulnerability could violate GDPR (data protection) and HIPAA (health data privacy) by exposing personal or sensitive data. Organizations may face fines, legal penalties, or reputational damage due to non-compliance with data protection requirements.

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Mitigation Strategies

Upgrade Zipline to version 4.0.2 or later to address the predictable filename issue. Additionally, review and restrict access to upload directories to prevent unauthorized access to private files.

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