11/18/2023 0 Comments Grep tutorial natasWhere x is any valid char, A-Z, a-z, and 0-9. We can do this with a nested subcommand of: $(grep x /etc/natas_webpass/natas17) Grepping inside of our grep commandĪs with the last level, we can build out a solution one character at a time. The resulting passthru() command would be: grep -i "natas16" dictionary.txtĪ quick search will show that natas16 doesn’t appear in dictionary.txt, so this should return empty. If we were to input $(whoami) as our command, that would evaluate to natas16. This is for interpolating a subshell command into a string. is a command of our choice, since $ and parentheses are still allowed. One of the things we still are allowed to do is $(.), where the. Whereas this level has: passthru("grep -i \"$key\" dictionary.txt") In other words, Level 10 had: passthru("grep -i $key dictionary.txt") That’s because our $key value is being put within quotes, so we’re searching for that entire string within dictionary.txt. * /etc/natas_webpass/natas17 dictionary.txt, we get no output. * /etc/natas_webpass/natas17, which will expand to grep -i. If we try the same approach as last time, entering. My first idea was to use something like $("value here" ^ "bitwise key here") to XOR encode and other forbidden characters, but I quickly realized that " isn’t allowed either.Īs with last time, spaces are still allowed. This time, the source code shows us that // are filtered out. This is another “needle” challenge similar to levels 9 and 10. As before, make sure you keep notes and write down the passwords as you find them! Level 16 ➔ 17įirst, grab the password from level 13 and head to, then login with username natas16 and the password. As you progress through the levels, you’ll need to increment the level number in the URL in order to view the correct level.Įach level requires the levels below it to be solved, so you will need the level 16 flag found in level 15 to begin this walkthrough. Natas is hosted on different subdomains following the pattern of. If you are looking for a beginner introduction to web security (albeit an older tech stack), then Natas is a great place to start. OverTheWire is a website with a number of “war games”, which are online hacking games that allow you to practice security concepts. Natas is an online hacking game meant to help you learn and practice security concepts.
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