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Full Discussion: Curious
Top Forums UNIX for Dummies Questions & Answers Curious Post 34594 by LivinFree on Friday 28th of February 2003 03:33:31 PM
Old 02-28-2003
A Backdoor can be via telnet, ftp, ssh, a netcat listener, a custom process, or just about any other net-aware process out there. Some holes that have been used in the past were actually executed through the Sendmail daemon, or via an insecure web cgi.

My favorite place for up-to date security information (and research on past issues) is Bugtraq. You can subscribe to the list, or browse via www.securityfocus.com .

Also, keep in mind it may be near impossible to find someone once they're in. For example, many of the Linux Rootkits floating around modify the system in a way the ls doesn't really show all files, ps doesn't show all processes, lsmod doesn't show all modules loaded. Can you imagine trying to search for "clues" when ls, ps, lsof, find, lsmod, etc etc have been modified? Ick.
 

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bup-ls(1)						      General Commands Manual							 bup-ls(1)

NAME
bup-ls - list the contents of a bup repository SYNOPSIS
bup ls [-s] [-a] DESCRIPTION
bup ls lists files and directories in your bup repository using the same directory hierarchy as they would have with bup-fuse(1). The top level directory contains the branch (corresponding to the -n option in bup save), the next level is the date of the backup, and subsequent levels correspond to files in the backup. When bup ls is asked to output on a tty, it formats its output in columns so that it can list as much as possible in as few lines as possi- ble. However, when bup ls is asked to output to something other than a tty (say you pipe the output to another command, or you redirect it to a file), it will output one file name per line. This makes the listing easier to parse with external tools. Note that bup ls doesn't show hidden files by default and one needs to use the -a option to show them. Files are hidden when their name begins with a dot. For example, on the topmost level, the special directories named .commit and .tag are hidden directories. Once you have identified the file you want using bup ls, you can view its contents using bup join or git show. OPTIONS
-s, --hash show hash for each file/directory. -a, --all show hidden files. EXAMPLE
bup ls /myserver/latest/etc/profile bup ls -a / SEE ALSO
bup-join(1), bup-fuse(1), bup-ftp(1), bup-save(1), git-show(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-ls(1)
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