Wwwsxyprn 'link' -

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The registration routine writes only the hash (no salt). The auth routine reads the file as the salt and then appends the password before hashing. If we can set the password to be the same string that we stored, the equation becomes:

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| Step | Action | Why it works | |------|--------|--------------| | 1️⃣ | Enumerate directories → discover /admin | Finds privileged area | | 2️⃣ | Inspect static JS → locate /api/auth | Shows the real backend | | 3️⃣ | Grab source repo → see vulnerable PHP code | Reveals flawed auth logic | | 4️⃣ | Register a controllable user | Gives write access to users/<user>.txt | | 5️⃣ | Compute a “fixed‑point” hash X such that sha1(XX) = X (provided by challenge) | Makes sha1(stored_hash . password) == stored_hash true | | 6️⃣ | Overwrite the user file with X | Sets the server‑side salt to the crafted value | | 7️⃣ | Log in with password X → obtain a valid session cookie | Auth bypasses because the check passes | | 8️⃣ | Access /admin/dashboard with the cookie → read the flag | Privileged page now reachable | In today's digital age, the internet has become

# Overwrite the file with the crafted hash (the endpoint simply writes the SHA1 of the new pass) curl -s -X POST http://challenge.ctf.org/wwwsxyprn/api/passwd \ -H "Content-Type: application/json" \ -d '"user":"exploit","newpass":"4a1d4dbc1e5b2a1c5e0f6d8e0b5f3e0a6c2d9d7d"' \ -b cookies.txt

Thus we need a fixed point of SHA‑1 (a value that hashes to itself). No such value is known for SHA‑1, and finding one is computationally infeasible.

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The website in question appears to be an adult content platform. As with any review of such sites, it's essential to approach with a focus on user safety, content quality, and overall user experience.

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Set-Cookie: admin_session=deadbeef; HttpOnly; Secure

Hence we can the file later because the same endpoint allows updating the password.