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[Bernd Dietzel <1520691@xxxxxxxxxxxxxxxxxx>]

maybe a problem when there is no trailig path delimiter it splits at the
";"

$ duplicity /tmp "ftp://user@localhost/test;bug";

commandline:
lftp -c 'source '/tmp/duplicity-0sMNWh-tempdir/mkstemp-h3m2mZ-1'; cd 'test/' || exit 0; ls'

args:
['/usr/bin/lftp', '-c', 'source /tmp/duplicity-0sMNWh-tempdir/mkstemp-h3m2mZ-1; cd test/ || exit 0; ls']

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https://bugs.launchpad.net/bugs/1520691

Title:
   Shell Code Injection in hsi backend

Status in Duplicity:
  Fix Released

Bug description:
  https://bugs.launchpad.net/ubuntu/+source/duplicity/+bug/1519103

  The "hsi" backend of duplicity is vulnerabe to code injections.

  It uses os.popen3() with should be replaced with subprocess.Popen().

  Thank you.

  File :
  -------
  /usr/lib/python2.7/dist-packages/duplicity/backends/hsibackend.py

  This is the function witch is vulnerable :
  ------------------------------------------------------------
      def _list(self):
          commandline = '%s "ls -l %s"' % (hsi_command, self.remote_dir)
          l = os.popen3(commandline)[2].readlines()[3:]

  Exploit Demo :
  ============

  On the Terminal type in :

  $ duplicity 'hsi://bug/";xeyes;"/test/' /tmp/bug

  --> This will start the program xeyes , but should not.

  I attached a screenshot of the exploit demo.

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