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SSRF bypass: IP addresses obfuscated as hostnames evade blocklists
- Engineer — Learn: Highlights that string-matching or IP blocklists for SSRF protection (e.g. blocking ‘169.254.169.254’) can be bypassed via hostname equivalents — review your SSRF defenses to ensure they resolve hostnames before comparing, not just match raw strings.
- SOC/IR — Learn: Useful context for tuning SSRF-related detections: logs showing hostname variants of link-local or metadata addresses in outbound requests may indicate bypass attempts worth adding to hunt queries.
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