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Fencer Vulns
medium 5.4

CVE-2019-14870 json

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 deleg…

published 2019-12-10 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-5985

cvss
5.4
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba samba 4.9.17, 4.10.11, 4.11.3
  • samba Debian 14, Debian 13, Debian 12 2:4.11.3+dfsg-1
  • heimdal Debian 14, Debian 13, Debian 12 7.7.0+dfsg-1

debian advisories DEBIAN-CVE-2019-14870

  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.24
  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
  • samba Ubuntu Pro 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4

ubuntu advisories UBUNTU-CVE-2019-14870

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 +1 more 4.10.17+git.203.862547088ca-3.14.1
  • ldb SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.5.8-3.5.1
  • samba SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1, SLE High Availability Extension 15 SP1 +1 more 4.9.5+git.224.86a8e66adea-3.18.1
  • samba SLE Module for Package Hub 15, SLE Module for Basesystem 15, SLE High Availability Extension 15 4.7.11+git.202.6edee83fb34-4.34.1

suse advisories SUSE-SU-2020:2673-1SUSE-SU-2019:3319-1SUSE-SU-2019:3318-1

  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1
  • libheimdal Package Hub 15 SP3, openSUSE Leap 15.3 7.8.0-bp153.2.4.1
  • libheimdal Package Hub 15 SP4, openSUSE Leap 15.4 7.8.0-bp154.2.4.1
  • samba openSUSE Leap 15.1 4.9.5+git.224.86a8e66adea-lp151.2.12.1

opensuse advisories openSUSE-SU-2024:11365-1openSUSE-SU-2023:0020-1openSUSE-SU-2023:0019-1openSUSE-SU-2019:2700-1

  • samba Alpine 3.10 4.10.11-r0
  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 4.11.3-r0
  • heimdal Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 7.7.1-r0

alpine advisories ALPINE-CVE-2019-14870

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-14870 updated cvss 5.4

samba: The DelegationNotAllowed Kerberos feature restriction was not being applied when processing protocol transition requests (S4U2Self), in the AD DC KDC

  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.4 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

  • Red Hat samba

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.