CVE-2019-14870

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.

Categories

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 2.95% Top 15%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory gentoo.org Vendor Advisory samba.org
Affected: Red Hat samba
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870 third party advisory issue tracking
https://usn.ubuntu.com/4217-1/ third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20191210-0002/ third party advisory
https://www.samba.org/samba/security/CVE-2019-14870.html vendor advisory
https://usn.ubuntu.com/4217-2/ third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/ vendor advisory
https://www.synology.com/security/advisory/Synology_SA_19_40 third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html vendor advisory mailing list third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/ vendor advisory
https://security.gentoo.org/glsa/202003-52 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html third party advisory mailing list
https://security.netapp.com/advisory/ntap-20230216-0008/
https://security.gentoo.org/glsa/202310-06 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-14870?
CVE-2019-14870 has been scored as a medium severity vulnerability.
How to fix CVE-2019-14870?
To fix CVE-2019-14870, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-14870 being actively exploited in the wild?
It is possible that CVE-2019-14870 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-14870?
CVE-2019-14870 affects Red Hat samba.
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