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CVE-2019-14870

Published: 10 December 2019

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.

Priority

Medium

CVSS 3 base score: 5.4

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
bionic
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.14)
disco
Released (2:4.10.0+dfsg-0ubuntu2.7)
eoan
Released (2:4.10.7+dfsg-0ubuntu2.3)
precise Not vulnerable

trusty
Released (2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4)
upstream
Released (4.11.3,4.10.11,4.9.17)
xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.24)