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CVE-2019-14870

MEDIUM5.4JSON exportCreate alert

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.

CVSS breakdown

CVSS 3.0
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Affected products

  • Red Hat / sambaall versions 4.11.x before 4.11.3 – all versions 4.11.x before 4.11.3
  • Red Hat / sambaall versions 4.10.x before 4.10.11 – all versions 4.10.x before 4.10.11
  • Red Hat / sambaall versions 4.x.x before 4.9.17 – all versions 4.x.x before 4.9.17

References