This Metasploit module exploits a command injection vulnerability on HP Client Automation, distributed actually as Persistent Systems Client Automation. The vulnerability exists in the Notify Daemon (radexecd.exe), which doesn't authenticate execution requests by default neither. This Metasploit module has been tested successfully on HP Client Automation 9.00 over Windows 2003 SP2 and CentOS 5.

Source: HP Client Automation Command Injection