| Name | CVE-2019-14870 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| NVD severity | medium |
| Debian Bugs | 946786 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| heimdal (PTS) | jessie (security), jessie | 1.6~rc2+dfsg-9+deb8u1 | vulnerable |
| stretch (security), stretch | 7.1.0+dfsg-13+deb9u3 | vulnerable | |
| buster | 7.5.0+dfsg-3 | vulnerable | |
| bullseye, sid | 7.7.0+dfsg-1 | fixed | |
| samba (PTS) | jessie | 2:4.2.14+dfsg-0+deb8u9 | vulnerable |
| jessie (security) | 2:4.2.14+dfsg-0+deb8u13 | vulnerable | |
| stretch (security), stretch | 2:4.5.16+dfsg-1+deb9u2 | vulnerable | |
| buster | 2:4.9.5+dfsg-5 | vulnerable | |
| buster (security) | 2:4.9.5+dfsg-5+deb10u1 | vulnerable | |
| bullseye, sid | 2:4.11.3+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| heimdal | source | (unstable) | 7.7.0+dfsg-1 | 946786 | ||
| samba | source | (unstable) | 2:4.11.3+dfsg-1 |
[buster] - samba <no-dsa> (Minor issue)
[stretch] - samba <no-dsa> (Minor issue)
[jessie] - samba <no-dsa> (Minor issue)
[buster] - heimdal <no-dsa> (Minor issue)
[stretch] - heimdal <no-dsa> (Minor issue)
[jessie] - heimdal <no-dsa> (Minor issue)
https://www.samba.org/samba/security/CVE-2019-14870.html
https://github.com/heimdal/heimdal/pull/663
https://github.com/heimdal/heimdal/pull/664 (port to 7.1 branch)