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Accessing Cisco Secure ACS 5.X Internals

Cisco does not hide the fact that Cisco Secure Access Control System (Secure ACS) 5.X is based on CentOS but provides no way to get to a Linux shell. Instead, when you log into Secure ACS you are presented with a Cisco IOS-like shell. This post will show you how to access the bash shell as root, and explores the underlying filesystem layout and utilities which make up Secure ACS. For the purposes of this blog, I am using Secure ACS VM 5.2. There may be slight variations in filesystem layout and utilities in later versions of Secure ACS. So