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RSSH Circumvention

RSSH Circumvention
Posted May 9, 2012
Authored by Derek Martin | Site pizzashack.org

Henrik Erkkonen has discovered that, through clever manipulation of environment variables on the ssh command line, it is possible to circumvent rssh.

tags | advisory
SHA-256 | e569ddc10821d9e494884093dab704f6cca8c684a13ead70079866b8250e251e

RSSH Circumvention

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rssh is a shell for restricting SSH access to a machine to only scp,
sftp, or a small set of similar applications.

http://www.pizzashack.org/rssh/

Henrik Erkkonen has discovered that, through clever manipulation of
environment variables on the ssh command line, it is possible to
circumvent rssh. As far as I can tell, there is no way to effect a
root compromise, except of course if the root account is the one
you're attempting to protect with rssh...

This project is old, and I have no interest in continuing to maintain
it. I looked for easy solutions to the problem, but in discussing
them with Henrik, none which we found satisfactorily address the
problem. Fixing this properly will require more work than I want to
put into it.

Note in particular that ensuring that the AcceptEnv sshd configuration
option need not be turned on for this exploit to work.

--
Derek D. Martin
http://www.pizzashack.org/
GPG Key ID: 0x81CFE75D

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