Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!

Bug 881497 (CVE-2019-14870)

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

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.