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.
CPE | Name | Operator | Version |
---|---|---|---|
ubuntu_linux | eq | 18.04 | |
ubuntu_linux | eq | 19.04 | |
ubuntu_linux | eq | 14.04 | |
ubuntu_linux | eq | 19.10 | |
ubuntu_linux | eq | 16.04 | |
debian_linux | eq | 9.0 | |
debian_linux | eq | 10.0 | |
fedora | eq | 30 | |
fedora | eq | 31 | |
leap | eq | 15.1 |
lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html
bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
lists.debian.org/debian-lts-announce/2021/05/msg00023.html
lists.debian.org/debian-lts-announce/2022/11/msg00034.html
lists.fedoraproject.org/archives/list/[email protected]/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
lists.fedoraproject.org/archives/list/[email protected]/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
security.gentoo.org/glsa/202003-52
security.gentoo.org/glsa/202310-06
security.netapp.com/advisory/ntap-20191210-0002/
security.netapp.com/advisory/ntap-20230216-0008/
usn.ubuntu.com/4217-1/
usn.ubuntu.com/4217-2/
www.samba.org/samba/security/CVE-2019-14870.html
www.synology.com/security/advisory/Synology_SA_19_40