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Bug 881497 (CVE-2019-14870) - [Tracker] Kerberos user attribute delegation mishandling
Summary: [Tracker] Kerberos user attribute delegation mishandling
Alias: CVE-2019-14870
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Depends on: CVE-2019-14861 CVE-2021-44758, CVE-2022-3671, CVE-2022-41916, CVE-2022-44640, CVE-2022-44758
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Reported: 2022-11-16 15:23 UTC by John Helmert III
Modified: 2023-10-08 07:10 UTC (History)
0 users

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Runtime testing required: ---


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Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-11-16 15:23:05 UTC
CVE-2019-14870 (
  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.