I am trying to solve the Command Injection Skills Assessment.
I have tried the below payloads but I am unable to solve the issue. could anyone guide me to solve this.
The Unix mv needs two arguments from and to. You must create an code injection which yield a valid mv command call followed by a command call you like to execute.
You can develop the needed arguments with a local bash. Like
from=filea
to=fileb
mv $from $to
If the arguments for from and to worked local, then you can test the bash command injection on the server.
Thank you for the information, I have solved the assessment.
Need to identify the working injection operator (|| or && or & or $() or and then find the proper payload to read the flag.txt (use o’bf’usc’at’ion or proper encoding and replace the filtered characters with environment variables or alternate characters)
Some time, the content of the flag.txt will appear with error message.
Currently working on this one, just keep getting hit with 302s so not sure where any purchase is. Do you know if I can use either download, copy, or move - will intercepting and injecting any of these commands work, or is there a specific one that’s the way in and if so do you know why? Thanks!
After you identify the vulnerable api endpoint, you see the error message contains something you could control. then why not just put flag here? use technique you’ve learned before, it just works.
By the way, if you try to do something to some folder, then you could download the source code of this vulnerable application.
I’ve just completed it with a bit of help from the posts above.
You’re on the right track here with the injection point, which is why it’s throwing the “Malicious request” error. I had another look at the “Bypassing Other Blacklisted Characters” and played about with some of the parameters in there, putting them after “.txt” along with a payload.
i am stuck at the finding flag.txt in command injection i have tried
ip=127.0.0.1%0ac’a’t${IFS}${PATH:0:1}home${PATH:0:1}flag.txt
and crafted it with different paylods for burp i am still not able to find it
and then find the proper payload to read the flag.txt (use o’bf’usc’at’ion or proper encoding and replace the filtered characters with environment variables or alternate characters)
