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Active directory Hack it & Harden-it

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L’Active Directory est aujourd’hui la clé de voûte du Système d’Information de nombreuses organisations. La majorité des attaques que rencontrent les entreprises passe par une compromission de leur Active Directory.

Retour d'expérience sur les failles critiques les plus présentes et exploitées ainsi que les solutions pour y remédier.

HACK-IT-N, Novembre 2019

Publié dans : Ingénierie
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Active directory Hack it & Harden-it

  1. 1. Active Directory Hack-it & Harden-it
  2. 2. Active Directory Hack-it & Harden-it @Wavestone Pentester / Red Teamer Cert-W Intérêts Active Directory / Windows Judo Rémi ESCOURROU @remiescourrou
  3. 3. © WAVESTONE 3 Utilisateurs Applications & Données Postes & Serveurs L’Active Directory, une infrastructure centrale et incontournable Sa compromission permet de prendre le contrôle de l’ensemble des systèmes et des données de l’entreprise
  4. 4. © WAVESTONE 4 De nos tests d’intrusions internes se sont soldés par la compromission totale de l’Active Directory 96% Les résultats de 2019 ne s’annoncent guère meilleurs …
  5. 5. © WAVESTONE 5 75 % d’un défaut de mise à jour Actuellement, dans votre SI MS08-067 #Conficker MS14-068 #Kerberos MS17-010 #EternalBlue CVE-2019-0708 #BlueKeep Réseau interne Premier serveur compromis
  6. 6. © WAVESTONE 6 75 % d’un défaut de mise à jour Actuellement, dans votre SI 80 % d’un défaut de configuration Réseau interne Premier serveur compromis
  7. 7. © WAVESTONE 7 75 % d’un défaut de mise à jour Actuellement, dans votre SI 80 % d’un défaut de configuration Réseau interne Premier serveur compromis 100 % de l’identification d’un mot de passe
  8. 8. © WAVESTONE 8 Premier serveur compromis Actuellement, dans votre SI 1 cas sur 3 sans rebond Contrôleur de domaine (Active Directory)
  9. 9. © WAVESTONE 9 Actuellement, dans votre SI 1 cas sur 3 sans rebond 2 cas sur 3 avec rebond Premier serveur compromis Contrôleur de domaine (Active Directory) EDR & Antivirus
  10. 10. © WAVESTONE 10 Premier serveur compromis Contrôleur de domaine (Active Directory) Réseau interne Dans 80 % des audits réalisés, la compromission est totale en moins de 24h
  11. 11. © WAVESTONE 11 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP
  12. 12. © WAVESTONE 12 Tier 0 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP Contrôleur de domaine Admins du domaine, Enterprise Admins, … RETIRER “ADMINS DU DOMAINE” DU GROUPE LOCAL “ADMINISTRATEURS” SUR LES MACHINES 1 2 DÉPLOYER UNE GPO “DENY ACCESS LOGON” SUR LES MACHINES NE PAS UTILISER LES GROUPES BUILT’IN (OPERATEUR DE SERVEURS, COMPTES, BACK-UP, …) 3 METTRE EN PLACE UN SILO D’AUTHENTIFICATION4
  13. 13. © WAVESTONE 13 Tier 0 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP Contrôleur de domaine Admins du domaine, Enterprise Admins, … METTRE EN PLACE UN SILO D’AUTHENTIFICATION4 “L’administration en silo” SSTIC 2017 - Aurélien Bordes ➢ Un ensemble de machines et d’utilisateurs ➢ Une stratégie d’authentification La stratégie d’authentification doit autoriser l’authentification des utilisateurs du silo uniquement depuis les machines du silo
  14. 14. © WAVESTONE 14 Tier 0 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP Contrôleur de domaine Admins du domaine, Enterprise Admins, … Poste dédié UN POSTE STRICTEMENT DÉDIÉ AUX OPÉRATIONS D’ADMINISTRATION AFIN DE DÉFINIR UN SILO 1 2 UN POSTE DURCI : PAS D’ACCÈS SUR INTERNET, UN FIREWALL LOCAL, ETC.
  15. 15. © WAVESTONE 15 Tier 0 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP Contrôleur de domaine Admins du domaine, Enterprise Admins, … Poste dédié WSUS AV & EDR Back-up … Hyperviseur ASSURER LA SÉCURITÉ DES SERVICES « EXÉCUTANT DU CODE » SUR LES POSTES & DC 1 2 NE PAS OUBLIER LES COUCHES BASSES
  16. 16. © WAVESTONE 16 CONNAITRE SON SYSTÈME D’INFORMATION POUR MIEUX LE PROTÉGER 1 … NE JAMAIS RÉDUIRE LE NIVEAU DE SÉCURITÉ GLOBAL POUR UNE EXCEPTION Antivirus : 6 812 machines Configuration Management Database (CMDB) : 12 683 machines Active Directory : 5 124 machines WSUS : 7 561 machines AAAAAA.csv: 26 561 machines Est il possible de … sortir la machine du domaine ? Est il possible de … isoler la machine dans une DMZ ? Est il possible de … patcher virtuellement la machine ? Est il possible de … Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP
  17. 17. © WAVESTONE 17 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP 2 ASSURER UNE GESTION PROPRE DES SECRETS D’AUTHENTIFICATION DES COMPTES Local Admin Password Solution (LAPS) Adm-E (gestion de l’historique) Administrateur local #RID500 Fine-Grained Password Policies (FGPP) Managed Service Accounts (MSA) Comptes de service #Kerberos Fine-Grained Password Policies (FGPP) Protected Users Comptes d’administration
  18. 18. © WAVESTONE 18 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots Respecter une hygiène de base CMDB PWD / LAPS / FGPP 1 CONNAITRE SON SYSTÈME D’INFORMATION POUR MIEUX LE PROTÉGER
  19. 19. © WAVESTONE 19 Adopter le tier 0 (ESEA) Privilèges par défaut Déployer un poste d’administration Dédié et durci Détecter les basiques Audit / Honeypots 2 « NEVER ATTEMPT TO WIN BY FORCE WHAT CAN BE WON BY DECEPTION » NICOLAS MACHIAVEL Respecter une hygiène de base CMDB PWD / LAPS / FGPP “Forging Trusts for Deception in Active Directory” Brucon 2018 - @nikhil_mitt Description d’un utilisateur Répertoire réseau “domainnetlogon” Mots de passe en clair Définition d’un ServicePrincipalName sur un compte privilégié Délégation non contrainte La tentation “Kerberos” « Windows 2003 » dans l’attribut OperatingSystem Des cibles faciles
  20. 20. © WAVESTONE 20 Azure Active Directory ?! Tier 0 Contrôleur de domaine Azure AD AD FS AD CONNECT Utilisateurs Architecture hybride classique
  21. 21. © WAVESTONE 21 Azure Active Directory Un peu d’architecture Mes fonctionnalités préférées Tier 0 Contrôleur de domaine Azure AD AD FS AD CONNECT Utilisateurs Architecture hybride classique 1 PROTÉGER L’AD FS ET L’AD CONNECT COMME UN DC 2 ASSURER LE MÊME NIVEAU DE SÉCURITÉ POUR L’ADMINISTRATEUR « AZURE AD » QU’ON-PREMISE (MFA, CONDITIONNAL ACCESS,…)
  22. 22. © WAVESTONE 22 1 IDENTIFIER DES MOTS DE PASSE FUITÉS 2 BANNIR LES MOTS DE PASSE FAIBLES Azure Active Directory Un peu d’architecture Mes fonctionnalités préférées
  23. 23. © WAVESTONE 23 / Adsecurity (@PyroTek3) : https://adsecurity.org/ / SpectorOps Team / BloodHound https://specterops.io/resources/research-and-development / Huy (@IdentitySec) : Audit & durcissement AD, Azure / AD Security Workshop : https://github.com/wavestone- cdt/AD-security-workshop / Grouper2 (@mikeloss) : https://github.com/l0ss/Grouper2 / PingCastle (@mysmartlogon) : https://www.pingcastle.com/ / AD Attack Defense (@infosecn1nja) : https://github.com/infosecn1nja/AD-Attack-Defense / Administration Silo (Aurelien Bordes) : https://www.sstic.org/user/abordes / Honey AD (@nikhil_mitt) : https://www.labofapenetrationtester.com/ / Bloodhound Slack : https://bloodhoundgang.herokuapp.com/ / CommandoVM : https://github.com/fireeye/commando-vm Références - Aller plus loin
  24. 24. © WAVESTONE 24 Now it’s YOUR TURN! Adopter le tier 0 Déployer un poste d’administration Respecter une hygiène de base Détecter les basiques Profiter d’Azure AD
  25. 25. © WAVESTONE 25 Now it’s YOUR TURN! Adopter le tier 0 Déployer un poste d’administration Respecter une hygiène de base Détecter les basiques Profiter d’Azure AD @remiescourrou

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