Server-Side Request Forgery in Mail Module

Executive Summary

This vulnerability allows backend users with access to the mail module to make the server send requests to internal network hosts. The server fetches content from external URLs in emails, stylesheets, and images without validating the target host, potentially exposing internal systems.

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Detection Guidance

Check for unusual outbound requests from your TYPO3 Mail extension server to internal network hosts. Monitor logs for requests to private IP ranges (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16). Use network sniffing tools like tcpdump or Wireshark to capture outbound traffic from the server running the Mail extension.

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Impact Analysis

An attacker with mail module access could exploit this to probe internal networks, steal sensitive data, or launch further attacks. The server may become a gateway for unauthorized internal network access, compromising confidentiality and integrity.

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Compliance Impact

This vulnerability could lead to unauthorized data exposure, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties and reputational damage.

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Mitigation Strategies

Disable the TYPO3 Mail extension if not in use. Update the extension to the latest patched version if available. Restrict backend user permissions to prevent unauthorized access to the mail module. Implement network-level controls to block outbound requests to internal IP ranges from the server.

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