CVEvulnerability

CVE-2019-14870

5.4 MEDIUM Published 2019-12-10 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2019-12-10
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 3.0 ([email protected])
5.4 MEDIUM — CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 2.0 ([email protected])
6.4 MEDIUM — AV:N/AC:L/Au:N/C:P/I:P/A:N
Weaknesses
CWE-285, CWE-287

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.

Affected configurations

• samba samba (>= 4.0.0 < 4.9.17) • samba samba (>= 4.10.0 < 4.10.11) • samba samba (>= 4.11.0 < 4.11.3) • fedoraproject fedora 30 • fedoraproject fedora 31 • canonical ubuntu linux 14.04 • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • canonical ubuntu linux 19.04 • canonical ubuntu linux 19.10 • debian debian linux 9.0 • debian debian linux 10.0 • opensuse leap 15.1

Related

Weakness · CWE (2)

  • CWE-285 Improper Authorization weakness
  • CWE-287 Improper Authentication weakness

References