Уязвимость LDAP-сервера пакета программ сетевого взаимодействия Samba, связанная с ошибкой при обработке запросов, содержащих зацикленные записи CNAME, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость в работе центра распределения ключей (KDC) пакета программ сетевого взаимодействия Samba, связанная с ошибками при двойной очистке одного и того же участка памяти, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость механизма работы поиска по протоколу LDAP пакета программ сетевого взаимодействия Samba, связанная с разыменованием нулевого указателя, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость компонента сборки MIT Kerberos Samba AD DC программ сетевого взаимодействия Samba, позволяющая нарушителю вызвать отказ в обслуживании

A denial of service vulnerability was discovered in Samba's LDAP server before versions 4.7.12, 4.8.7, and 4.9.3. A CNAME loop could lead to infinite recursion in the server. An unprivileged local attacker could create such an entry, leading to denial of service.

Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.

Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.