Roughman Injection Rapidshare 1 =link= «Exclusive • WORKFLOW»

For completeness, here is a tiny curl command you can run (replace HOST with the actual challenge host):

curl -s "http://HOST/roughman-injection/rapidshare1.php?link=php%3A%2F%2Ffilter%2Fconvert.base64-encode%2Fresource%3D%2Fhome%2Fctf%2Fflag.txt" |
    grep -oE '[A-Za-z0-9+/=]+' |
    base64 -d

The pipeline:

| Technique | Why it matters | |-----------|----------------| | PHP stream wrappers (php://filter, expect://) | They let you read arbitrary files or execute commands without needing classic SQL/OS injection. | | URL‑encoding bypasses | Many naive filters inspect the raw string before PHP decodes it. Encoding characters like : and / can slip past. | | Base64 encoding | php://filter can transform binary data into a safe printable format, making extraction reliable. | | Enumeration of common paths | Flags are often placed in predictable locations; try them systematically. | | Burp Suite (or any intercepting proxy) | Essential for tweaking parameters quickly and observing server responses in real time. |

The Roughman Injection – Rapidshare 1 challenge is a textbook example of abusing PHP’s flexible stream wrappers. The core idea is “the application trusts user input as a file path; give it a special wrapper and you can read anything.”

By following the systematic approach—recon → locate injection point → test wrappers → bypass filters → retrieve flag—you can solve this challenge (and many similar ones) reliably.

Happy hacking, and remember to keep your testing confined to the intended CTF environment!

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Sometimes the challenge adds a very naive filter such as:

if (strpos($link, 'http') !== false) 
    die('Only local files allowed');

or it strips certain substrings (php, ://, filter).

Typical bypasses:

| Filter | Bypass technique | |--------|------------------| | str_replace('php', '', $link) | Use p%68p (URL‑encoded p%68p) – the filter sees pp and does not remove it, PHP still parses it as php after decoding. | | Blocking :// | Use %3a%2f%2f (URL‑encoded colon and slashes) – many filters only look at plain text before URL decoding. | | Disallowing flag.txt | Use %66%6c%61%67.txt (hex‑encoded) or a symlink trick if the server follows them. |

Practical example:

link=php%3A%2F%2Ffilter%2Fconvert.base64-encode%2Fresource%3D%2Fhome%2Fctf%2Fflag.txt

When the server decodes the URL, it becomes the proper wrapper string. For completeness, here is a tiny curl command

The Roughman Injection – Rapidshare 1 challenge is a typical web‑application injection task. The goal is to retrieve a hidden flag (usually a string that looks like FLAG…) from a server that hosts a simple “file‑sharing” interface.

Key characteristics of the challenge:

| Aspect | Details | |--------|---------| | Category | Web – Injection (SQL / Command / File) | | Entry point | A single HTTP GET/POST endpoint that accepts a “link” (or “url”) parameter. | | Goal | Exploit the injection to read the contents of a protected file (e.g., flag.txt or /etc/passwd) that is otherwise inaccessible. | | Typical flag format | FLAG… (or CTF…) | | Restrictions | The service runs inside a sandbox with limited OS commands; no direct shell access. |

Below is a step‑by‑step walk‑through of how the challenge can be solved, from initial recon to the final flag retrieval.

Below is a concrete set of steps that worked for the “Rapidshare 1” instance during the competition.

If the challenge disables allow_url_fopen for remote URLs, php://filter may be blocked. Some PHP installations still allow the expect:// wrapper, which runs a command and streams its stdout.

expect://cat /home/ctf/flag.txt

The request becomes:

...rapidshare1.php?link=expect://cat%20/home/ctf/flag.txt

The server executes cat /home/ctf/flag.txt and returns its output directly.

Note: This works only when expect is enabled (rare in modern PHP, but often left on in CTF labs).

Often the flag resides outside the document root (e.g., /home/ctf/flag.txt or /var/www/flag). In that case php://filter still works, you just need the full absolute path.

Find the path

php://filter/convert.base64-encode/resource=../../../../home/ctf/flag.txt

If the wrapper respects the real filesystem, the above will succeed.

Result: you get the Base64 flag and can decode it.