CVE-2019-14870

Publication date 10 December 2019

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	19.10 eoan	Fixed 2:4.10.7+dfsg-0ubuntu2.3
	19.04 disco	Fixed 2:4.10.0+dfsg-0ubuntu2.7
	18.04 LTS bionic	Fixed 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
	16.04 LTS xenial	Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.24
	14.04 LTS trusty	Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4 Ubuntu Pro

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Severity score breakdown

Parameter	Value
Base score	5.4 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVE-2019-14870

Cvss 3 Severity Score

Status

Get expanded security coverage with Ubuntu Pro

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references