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502124c1e7
Fixes the following security vulnerabilities: - CVE-2018-14629: All versions of Samba from 4.0.0 onwards are vulnerable to infinite query recursion caused by CNAME loops. Any dns record can be added via ldap by an unprivileged user using the ldbadd tool, so this is a security issue. - CVE-2018-16841: 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. There is no further vulnerability associated with this issue, merely a denial of service. - CVE-2018-16851: 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. - CVE-2018-16853: A user in a Samba AD domain can crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory we 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. For more details, see the release notes: https://www.samba.org/samba/history/samba-4.8.7.html Signed-off-by: Peter Korsgaard <peter@korsgaard.com>