Bulletin d'alerte Debian

DSA-266-1 krb5 -- Plusieurs failles

Date du rapport:

24 mars 2003

Paquets concernés:

Vulnérabilité:

Oui

Références dans la base de données de sécurité:

Dans le dictionnaire CVE du Mitre : CVE-2003-0028, CVE-2003-0072, CVE-2003-0082, CVE-2003-0138, CVE-2003-0139.
Les annonces de vulnérabilité et les bulletins d'alerte du CERT : VU#623217, VU#442569, VU#516825, CA-2003-10.

Pour plus d'information:

Plusieurs failles de sécurité ont été découvertes dans krb5, une implémentation de Kerberos du MIT.

Une faiblesse cryptographique dans la version 4 du protocole Kerberos permet à un attaquant d'utiliser une attaque via un texte simple pour être authentifié par les contrôleurs de domaine. D'autres faiblesses cryptographiques dans l'implémentation krb4 incluse dans la distribution de krb5 du MIT permettent l'utilisation d'attaques copier/coller pour fabriquer des tickets krb4 pour des clients non autorisés si les clés triple-DES sont utilisées pour les services de clé de krb4. Ces attaques peuvent compromettre l'entière infrastructure d'authentification Kerberos.
Kerberos version 5 ne contient pas cette faille cryptographique. Les sites ne sont pas vulnérables s'ils ont complètement désactivé Kerberos v4, incluant tout service de traduction de krb5 vers krb4 ;
L'implémentation de Kerberos 5 du MIT inclut une bibliothèque RPC basée sur SUNRPC. L'implémentation contient des vérifications de taille qui sont vulnérables au dépassement d'entier, ce qui est exploitable pour créer des dénis de service ou gagner des accès non autorisés à des informations sensibles ;
Des problèmes de sur et de sous-exploitations des tampons existent dans la gestion des noms de principaux contrôleurs de Kerberos dans certains cas comme des noms sans composant, avec un composant vide ou un service basé sur le nom de machine sans composant de nom de machine.

Cette version du paquet krb5 modifie le comportement par défaut et ne permet plus l'authentification entre domaine pour Kerberos version 4. En raison de la nature fondamentale de ce problème, l'authentification entre domaines dans Kerberos version 4 ne peut être sécurisée et les sites devraient éviter de l'utiliser. Une nouvelle option (-X) a été ajoutée pour les commandes krb5kdc et krb524d pour réactiver l'authentification entre domaine de la version 4 pour ces sites qui ont besoin de cette fonctionnalité mais qui souhaitent également bénéficier de la correction de sécurité.

Pour la distribution stable (Woody), ces problèmes ont été corrigés dans la version 1.2.4-5woody4.

L'ancienne distribution stable (Potato) n'est pas concernée car elle n'inclut pas krb5.

Pour la distribution instable (Sid), ces problèmes seront bientôt corrigés.

Nous vous recommandons de mettre à jour votre paquet krb5.

Corrigé dans:

Debian GNU/Linux 3.0 (woody)

Source :: http://security.debian.org/pool/updates/main/k/krb5/krb5_1.2.4-5woody4.dsc; http://security.debian.org/pool/updates/main/k/krb5/krb5_1.2.4-5woody4.diff.gz; http://security.debian.org/pool/updates/main/k/krb5/krb5_1.2.4.orig.tar.gz
Composant indépendant de l'architecture :: http://security.debian.org/pool/updates/main/k/krb5/krb5-doc_1.2.4-5woody4_all.deb
Alpha:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_alpha.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_alpha.deb
ARM:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_arm.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_arm.deb
Intel IA-32:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_i386.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_i386.deb
Intel IA-64:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_ia64.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_ia64.deb
HPPA:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_hppa.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_hppa.deb
Motorola 680x0:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_m68k.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_m68k.deb
Big endian MIPS:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_mips.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_mips.deb
Little endian MIPS:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_mipsel.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_mipsel.deb
PowerPC:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_powerpc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_powerpc.deb
IBM S/390:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_s390.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_s390.deb
Sun Sparc:: http://security.debian.org/pool/updates/main/k/krb5/krb5-admin-server_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-clients_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-ftpd_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-kdc_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-rsh-server_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-telnetd_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/krb5-user_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkadm55_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb5-dev_1.2.4-5woody4_sparc.deb; http://security.debian.org/pool/updates/main/k/krb5/libkrb53_1.2.4-5woody4_sparc.deb

Les hachés MD5 des fichiers indiqués sont disponibles sur la page originale de l'alerte de sécurité.