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SSRF protection — no IP range blocking on remote dereference #4

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opened 2026-05-29 10:22:27 +00:00 by GKaszewski · 0 comments
GKaszewski commented 2026-05-29 10:22:27 +00:00
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When dereferencing remote object or actor URLs, there is no validation that the resolved IP is not in a private/reserved range (127.0.0.0/8, 10.0.0.0/8, 169.254.0.0/16, fc00::/7, etc.).

A malicious actor could craft an actor URL pointing at internal services, causing the server to make requests to the local network.

Suggested fix: resolve the hostname before connecting and reject private/loopback/link-local IP ranges. Consider a configurable allowlist for legitimate internal federation scenarios.

When dereferencing remote object or actor URLs, there is no validation that the resolved IP is not in a private/reserved range (127.0.0.0/8, 10.0.0.0/8, 169.254.0.0/16, fc00::/7, etc.). A malicious actor could craft an actor URL pointing at internal services, causing the server to make requests to the local network. Suggested fix: resolve the hostname before connecting and reject private/loopback/link-local IP ranges. Consider a configurable allowlist for legitimate internal federation scenarios.
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Reference: GKaszewski/k-ap#4
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