No Tools in a CTF

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[nelsoncorreia]

Love it. Never really considered how to use the terminal if the tools in Linux suddenly disappeared.

[IT_veille-pnmr]

You can also output the content of a file using :

echo $(</path/to/filename)

[movaxh]

To be pedantic, echo is not required to be a built-in into a shell (i.s. posix sh specification says absolutely nothing about echo). It can be just a binary in /bin/ (in fact there is one there just for this occasion).

[StuartMill]

John you make this look breezy as all heck! Always a treat to watch you work!

[bluesquare]

One time a coworker accidentally started removing / on a fbsd machine (aka no —no-preserve-root flag). Luckily I was standing over his shoulder and we ctrl + c’ed it right away. None the less he managed to wipe out half of bin. I couldn’t get onto the server because bash was gone. So luckily we were able to just quickly rsync bin from a different identical machine and fix it. But yeah it’s interesting to try to use a shell with no shell utils lolz! Kernel runs fine, system stayed up, Apache was still online to the outside you’d never even know we accidentally started nuking it.

[RedBigz]

I completely didn't know the read command until yesterday, because I was trying to parallelize some cracking tools, and this gem pops up on my shorts. Awesome timing.

[Jarvx]

I think they gave this particular challenge at the Bsides San Francisco CTF a week ago, pretty fun experience

[muB]

In some `sh` implementations, trying to execute `sh /path/to/script` will lead to all unavailable "commands" in that script reported in the terminal. Since `sh` is supposed to be available, `sh /home/ctf/flag.txt` might also work.

[huntit]

Please more shorts like this love it ❤

[MyxT]

Wait if echo works why not just echo the file?

[_mrcrypt]

‘‘Tis the season to be practicing your CTF 🍷😜🏴‍☠️

[G-man_the-cyber-guy]

Please carry on with ctf and challenge walk through I love that content of yours! ❤

[Mirikant]

I don’t understand a thing that is happening but this all looks and sounds cool

[dylanvooski]

“Can you read it”

nice little hint there.

[maudjito]

You can just `< filepath` and it will show the contents of the file.

[someoneunqualified]

That's a super cool CTF and it's also just super simple

[mopioline]

bookmarking this one. I have a feeling I may need it one day lol

[Aera]

That can be critical when my live USB disconnects, and most binaries are either "Segmentation fault" or "I/O error"

[vnguardbb]

more shorts like these maybe even a ctf series

[elliot-hacks]

Hammond back on CTFs, bro got some awesome tricks