🛡️ Sentinel: [HIGH] Fix Log Injection / CRLF Injection via IPv6 Scope ID

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Log Injection (CRLF Injection). The ipaddress module permits arbitrary characters (like \r and \n) in the scope ID of an IPv6 address (e.g. fe80::1%eth0\nERROR:root:...). Since the SSRF validation block rejected these addresses but logged the untrusted input directly, an attacker could inject forged entries into application logs.
🎯 Impact: Log forging, confusion, corruption of log-analysis systems, and potential masking of other malicious activities.
🔧 Fix: Wrapped the ip argument in repr() before logging it to safely escape any control characters (e.g., converting \n to \n literal). Added a regression test (test_is_reachable_ssrf_log_injection) to test_testping1.py.
✅ Verification: Ran python3 -m unittest test_testping1.py and confirmed the new test passes, demonstrating the newline character is correctly escaped.

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PR created automatically by Jules for task 5413652337044024307 started by @ManupaKDU

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