The server executes cat /home/ctf/flag.txt and returns its output directly.
| Filter | Bypass technique | |--------|------------------| | str_replace('php', '', $link) | Use (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. |
: Modern sites that reuse these old keywords often serve as traps for "injection" attacks or malware, rather than actual media content. Disclaimer
or game "trainers" that are frequently used as disguises for malware. "Rapidshare" : A defunct file-hosting service. Its name is still used in scam links to create a false sense of a legitimate file download. "Roughman"
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Visiting the page shows a minimal UI:
Launched in the mid-2000s, Rapidshare was one of the pioneer one-click hosting sites. Users uploaded split files (often labeled .part1.rar or simply 1 ), which explains the trailing "1" in many legacy searches.
By following the systematic approach——you can solve this challenge (and many similar ones) reliably.
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