Directory Traversal in ZIP Archive Extraction Leading to RCE

Executive Summary

This vulnerability allows a high-privileged remote attacker to upload a malicious ZIP archive containing directory traversal sequences like ../. The improper validation of archive entry paths lets the attacker escape the intended extraction directory and write files to arbitrary locations on the server. This could lead to arbitrary code execution and full system compromise.

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Detection Guidance

To detect this vulnerability, monitor for unexpected file writes outside intended directories, especially in web roots or system folders. Check logs for ZIP extraction operations with suspicious paths containing ../ sequences. Use tools like grep or find to search for recently modified files in unauthorized locations.

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Impact Analysis

An attacker could exploit this to overwrite critical system files, install malware, or gain full control of the affected server. This may result in data theft, service disruption, or unauthorized access to sensitive information.

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Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's security rules. Non-compliance may result in legal penalties, fines, or reputational damage.

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Mitigation Strategies

Immediately update or patch the affected software to the latest version that fixes the directory traversal vulnerability in ZIP archive handling. Disable or restrict upload functionality if not required. Implement strict input validation for archive paths to prevent traversal sequences. Monitor system logs for unusual file writes or extraction attempts.

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