ProFTPD (patched) is listening on port 2123
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=== Test 1: RNFR exploit on patched version should be blocked ===
RNFR denied on patched version: 550 /proc/self/root/data/pruva/runs/6c58a5e9-ad13-4784-a1dd-3203170b92c6/bundle/artifacts/ftp-root-patched/protected/secret.txt: Operation not permitted

=== Test 2: DELE variant on patched version (bypass check) ===
Proc-prefixed DELE allowed on patched version (bypass!)

=== Results ===
patched_rnfr: DENIED
patched_dele: ALLOWED

Bypass confirmed: proposed RNFR fix does not block DELE variant