Detections
Analytics
CVE-2019-14870
medium
Description
All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.
References
https://www.synology.com/security/advisory/Synology_SA_19_40
https://usn.ubuntu.com/4217-2/
https://usn.ubuntu.com/4217-1/
https://security.netapp.com/advisory/ntap-20191210-0002/
https://security.gentoo.org/glsa/202310-06
https://security.gentoo.org/glsa/202003-52
https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html