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Bjorn: A powerful network scanning and offensive security tool for Raspberry Pi (github.com/infinition)
161 points by ulrischa 20 days ago | hide | past | favorite | 28 comments



Preparing my honeypot right now: https://github.com/infinition/Bjorn/blob/9ea706ccc03437a9dd1...


Nice catch. IMHO, it's a little too obvious, so probably not a bugdoor. Maybe someone who knows better wasn't getting enough sleep.


Can someone explain for those of us who aren't as savvy?


With a well-crafted filename, you can run arbitrary commands on the attackers computer.


I know just a little bit of python and that looks like it does what the description says. Maybe I wouldn't use subprocess but do it via the standard lib.

What should we be looking for in the code?


shell=True is a security risk unless you're very careful with escaping inputs. In this case any filename with a `;` in it (or various other shell characters) will run arbitrary commands on the attacker's computer.

best to pass a list of arguments to subprocess rather than a string, and avoid shell=True


Ah true! I fixated on exactly the line that was marked. I guess it's not that bad because you're choosing the file to copy, but I wouldn't have used a subshell for copying a file anyway.


I never understood why there even is an api for using a string...

Same for SQL statements, single quotes in a query string should generate a warning to just use prepared statements instead :-)


Python is a pretty big "I don't know what I'm doing" flag so I wouldn't be too surprised. Not always of course - there are plenty of well written Python projects - but Python and JavaScript are so popular for beginners that projects written by beginners tend to concentrate in those languages.


sit down rust boy.


and you know what you're doing, aren't you? lol


Yes I do know how to avoid basic string injection vulnerabilities.


Looking at the SSH actions, the "brute force" attack is just iterating through a list of usernames and passwords from an external file. Wow. Much impress. So Hacker.


Is there a simpler approach than dictionary attack?


Take a look at the list of CVEs and start hammering, chances are the SSH server was last updated some time around 2010.


A lot of complexity in that “start hammering” bit.


Mock all you want, a brute force attack (why the quotes? This is literally the textbook brute force attack) is an important part of pentesting.


If it ends up living up to the promise of the quality of the documentation (ie the README), I can’t wait to try it. Also screenshots of the display look cool.


The documentation looks a bit LLMish to me.


Which is good tbh, we get quality write down. LLMs are around for 2 years now, but not all the documentations use them.


I know I’m just a troll account but I can’t believe all it takes to get 1k stars on GitHub is just rewriting an automated file transfer script using five different protocols and claiming it’s some powerful offensive capability lmfao


There's also a cute display which I assume is much of the appeal.

The sophistication of the scanner seems a bit oversold at the moment.


You are more than a troll account.


For the brute-force attack, THC's hydra could be used instead of reinventing the wheel. Or are there licensing issues involved?


I don't see the "selling value" of this, can you give me a qrd?


Hydra unifies brute forcing dozens of protocols into a singular (cli) API. It is useful in that you don't have to have dozens of tools for each kind of service you might want to enumerate, each with their own interfaces.


If this integrated with Metasploit or some other tooling I might be impressed.the graphics are cool though.


Ahh yeah Bjorn, my pwnagotchi's new older brother. I really hope he can cheer him up - the little guy hasn't been the same ever since daddy decided he was more interested in penetrating that cups server.




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