Thursday, March 13, 2014

RedHat::Root access without password

Its quite interesting and somewhat funny at the same time.
I see people who have been using Linux for quite some time in some capacity or other and seem to come across as Linux-experts. When I ask them a very simple question like 'How do you login to a RedHat server when you do not have the credentials but have physical access?. Most people do not know the answer. To me, it seems quite strange. This should be one of the first things that you learn on Linux, the OS of the curious, adventurous and the hacking-types. They start talking about stuff that has nothing to do with changing runlevels. Zero-day BS is mentioned. All you Kon-booters, it is not needed and doesnt work on UEFI-enabled systems (which is available on all systems now a days).
Thought I'd explain the process (most serious Linux guys would know this, I'm sure, and agree with most of the above) for those who dont know.

1. Start the system
2. Hit 'e' to edit
3. Select the kernel (line with vmlinuz) and hit 'e' to edit.
4. Type 'init 1' at the end
5. Hit 'b' to boot.

You'll be logged into the console with root access.

Obviously, if you are serious about security, you will have disabled this feature on your system or have the system in a locked, authorized engineers only server-room.
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