SwagShop is an easy difficulty linux box running an old version of Magento. The version is vulnerable to SQLi and RCE leading to a shell. The www user can use vim in the context of root which can abused to execute commands.

TartarSauce is a fairly challenging box that highlights the importance of a broad remote enumeration instead of focusing on obvious but potentially less fruitful attack vectors. It features a quite realistic privilege escalation requiring abuses of the tar command. Attention to detail when reviewing tool output is beneficial when attempting this machine.

Valentine is a very unique medium difficulty machine which focuses on the Heartbleed vulnerability, which had devastating impact on systems across the globe.

SolidState is a medium difficulty machine that requires chaining of multiple attack vectors in order to get a privileged shell. As a note, in some cases the exploit may fail to trigger more than once and a machine reset is required.