Bug 881497 (CVE-2019-14870)

Summary:	[Tracker] Kerberos user attribute delegation mishandling
Product:	Gentoo Security	Reporter:	John Helmert III <ajak>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:	702928, 881429
Bug Blocks:

Description John Helmert III archtester

2022-11-16 15:23:05 UTC

CVE-2019-14870 (https://nvd.nist.gov/vuln/detail/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.