Path Traversal in Ichigo3766 image-gen-mcp

Executive Summary

This vulnerability is a path traversal issue in the Ichigo3766 image-gen-mcp 0.1.0 tool. It occurs in the upscale_images function where the output_path parameter is not properly validated. An attacker can manipulate this parameter to write files to arbitrary locations on the filesystem where the server process has write permissions. The attack requires local access.

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Detection Guidance

Check for unexpected file writes in system directories by monitoring the output_path parameter in the upscale_images tool. Look for files named upscaled_<input basename> outside the intended SD_OUTPUT_DIR. Review server logs for path traversal attempts in output_path values.

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Impact Analysis

This vulnerability allows an attacker to write files to unintended locations on the system. This could lead to filesystem pollution, overwriting important files, or placing malicious files in sensitive directories. The impact is limited to the permissions of the server process.

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Compliance Impact

The vulnerability allows arbitrary file writes to any writable location on the filesystem due to improper path validation in the output_path parameter. This could lead to unauthorized file creation, overwrites, or filesystem pollution, which may violate data integrity and access control requirements under GDPR and HIPAA. Unauthorized writes could expose or corrupt sensitive data, potentially breaching confidentiality or integrity principles.

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Mitigation Strategies

Restrict output_path to a safe root directory like SD_OUTPUT_DIR. Reject absolute paths and path traversal sequences in output_path. Validate the final output path against the allowed root before writing files. Consider using server-generated output directories instead of client-selected paths.

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