Executive Summary

This vulnerability exists in Emlog, an open source website building system, specifically in versions 2.6.2 and earlier. It is a path traversal vulnerability found in the emUnZip() function. When extracting ZIP archives such as plugin or template uploads and backup imports, the function extracts files without properly sanitizing the ZIP entry names. An authenticated admin can upload a specially crafted ZIP file containing entries with '../' sequences, which allows writing arbitrary files to the server's filesystem.

This can lead to the attacker placing malicious files, including PHP webshells, on the server, which can then be used to execute arbitrary code remotely, resulting in Remote Code Execution (RCE).

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Impact Analysis

This vulnerability can have severe impacts including unauthorized remote code execution on your server. An attacker with authenticated admin access can upload crafted ZIP files to write arbitrary files anywhere on the server filesystem.

• Execution of malicious PHP webshells allowing full control over the server.
• Potential data theft, data modification, or destruction.
• Compromise of the entire web application and possibly other connected systems.
• Service disruption or defacement of the website.

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Mitigation Strategies

Since there are no publicly available patches at the time of publication, immediate mitigation steps include restricting or disabling the ability for authenticated admins to upload ZIP archives until a fix is available.

Additionally, closely monitor and audit any ZIP archive uploads for suspicious entries containing path traversal sequences such as '../'.

Limiting admin access and ensuring the server filesystem permissions prevent unauthorized file writes can also reduce risk.

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Compliance Impact

This vulnerability allows an authenticated admin to upload crafted ZIP files that can lead to arbitrary file writes and remote code execution on the server. Such unauthorized access and control over the server can result in data breaches or unauthorized disclosure of sensitive information.

Consequently, this could impact compliance with standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and ensure system integrity.

However, the provided information does not explicitly detail the compliance implications or specific regulatory impacts.

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