duplicity-team team mailing list archive

[Kenneth Loafman <kenneth@xxxxxxxxxxx>]

Reopened and added duplicity-team to the subscribers.  This is not as
simple as splitting the command line into parts.  As long as you can
make the the pathname contain ';', you can insert commands.  Given the
example you gave last," ;xmessage hello bug;#/test" is a valid filename,
so filename validation will not work.

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

Title:
   Shell Code Injection in hsi backend

Status in Duplicity:
  In Progress

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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