Lynis
System/security auditing tool for hardening and securing Linux/Unix
... and possible configuration errors.
This software aims in assisting automated auditing, hardening, software patch management, vulnerability and malware scanning of Unix/Linux based systems. It can be run without prior installation, so inclusion on read only storage is possible (USB stick, cd/dvd).
Lynis assists auditors in performing Basel II, GLBA, HIPAA, PCI DSS and SOx (Sarbanes-Oxley) compliance audits, by automation of control testing.
Extended support for companies is available