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 delegationnotallowed (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.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbsharemodes0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-doc": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbsharemodes0": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "python-samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbsharemodes-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbsharemodes-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "python-samba": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libpam-smbpass-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-common": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "smbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4", "libpam-smbpass": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "python-samba": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "ctdb": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-common": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "smbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.16.04.24", "ctdb-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.24" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-libs": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "registry-tools": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-common-bin": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libwbclient0-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-dsdb-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libpam-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libnss-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-vfs-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "python-samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-common-bin-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-testsuite": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "smbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libsmbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libwbclient0": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libsmbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "python-samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-dsdb-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "registry-tools-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-vfs-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "ctdb": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libnss-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libsmbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-libs-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-testsuite-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-common": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libpam-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "smbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "samba-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "libparse-pidl-perl": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14", "ctdb-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.14" } ] }