This is the initial version of the RMLinux book, and there are no errata. As security implications are discovered in this book, they will be fixed as soon as possible.
In addition, the Linux From Scratch editors maintain a list of security vulnerabilities discovered after a book has been released. To read the list, please visit https://www.linuxfromscratch.org/lfs/advisories/ before proceeding with your build. You should apply the changes suggested by the advisories to the relevant sections of the book as you build the RMLinux system. And, if you will use the RMLinux system as a real desktop or server system, you should continue to consult the advisories and fix any security vulnerabilities, even when the RMLInux system has been completely built.