🛡️ Sentinel: [HIGH] Fix SSRF bypass via Local-Use IPv4/IPv6 Translation (RFC 8215)

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Server-Side Request Forgery (SSRF) bypass allowing attackers to ping internal IP addresses by wrapping them in Local-Use IPv4/IPv6 Translation (RFC 8215) addresses (e.g., 64:ff9b:1::127.0.0.1). Python's ipaddress module evaluates these as is_global = True and does not automatically extract the embedded IPv4 address.
🎯 Impact: An attacker could bypass SSRF IP blocklists and probe internal subnets or local resources.
🔧 Fix: Added a manual check for the /96 mapping (ip_int >> 32 == 0x0064ff9b0001000000000000) to explicitly unpack the encapsulated IPv4 address and validate it using the standard SSRF blocklist rules. Added tests to guarantee this scenario is caught.
✅ Verification: Run python3 -m unittest test_testping1.py and ensure the test_is_reachable_ssrf_bypass_local_use_translation test passes.

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PR created automatically by Jules for task 15943869541579030197 started by @ManupaKDU

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