Attack Chain

1. The attacker identifies a vulnerable instance of duartium papers-mcp-server version 9ceb3812a6458ba7922ca24a7406f8807bc55598.
2. The attacker crafts a malicious HTTP request targeting the search_papers function.
3. Within the HTTP request, the attacker injects a path traversal payload into the topic argument, such as “../../etc/passwd”.
4. The server-side application, without proper sanitization, processes the malicious topic argument.
5. The application attempts to read the file specified by the attacker’s path traversal payload (e.g., /etc/passwd).
6. The server responds with the contents of the requested file, effectively leaking sensitive information to the attacker.
7. The attacker analyzes the leaked file for sensitive data, such as usernames, passwords, or configuration details.
8. The attacker uses the obtained information to further compromise the system or network.

Impact

Successful exploitation of this path traversal vulnerability allows attackers to read arbitrary files on the affected server. This could lead to the disclosure of sensitive configuration files, user credentials, or source code, potentially leading to further compromise, lateral movement within the network, and data breaches. The lack of a patch and the availability of a public exploit increases the likelihood of widespread exploitation and potential damage.

Recommendation

• Deploy the Sigma rule provided in this brief to detect exploitation attempts against the search_papers endpoint, focusing on path traversal payloads in the topic parameter.
• Implement input validation and sanitization on the topic parameter within the search_papers function to prevent path traversal attacks.
• Monitor web server logs for suspicious requests containing path traversal sequences like “../” and “./” in the URI query to detect potential exploitation attempts.
• Apply rate limiting to the search_papers endpoint to mitigate potential brute-force path traversal attempts.