🛡️ Sentinel: [MEDIUM] Fix CRLF Log Injection in Exception Handler

[ManupaKDU]

🚨 Severity: MEDIUM
💡 Vulnerability: The script's __main__ block exception handler directly embedded arbitrary user-supplied input (start_ip and end_ip parsing errors via str(e)) into logging.error(). An attacker supplying strings containing newline characters (CRLF) could forge or obfuscate log entries.
🎯 Impact: Log Injection (CRLF), allowing attackers to falsify log records, hide malicious activity, or disrupt log parsing systems.
🔧 Fix: Sanitized the exception message by wrapping the string representation in repr(), securely escaping control characters.
✅ Verification: Added an isolated unit test using subprocess.run to verify that newline payloads in start_ip exceptions are safely escaped in stderr.

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PR created automatically by Jules for task 4968080288271218056 started by @ManupaKDU

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