Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | >= 4.0.0, < 4.9.17 |
| Fedoraproject | Fedora | 30 |
| Canonical | Ubuntu Linux | 14.04 |
| Debian | Debian Linux | 9.0 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.htmlMailing ListThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00023.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00034.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.gentoo.org/glsa/202310-06
- https://security.netapp.com/advisory/ntap-20191210-0002/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230216-0008/
- https://usn.ubuntu.com/4217-1/Third Party Advisory
- https://usn.ubuntu.com/4217-2/Third Party Advisory
- https://www.samba.org/samba/security/CVE-2019-14870.htmlVendor Advisory
- https://www.synology.com/security/advisory/Synology_SA_19_40Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2019-14870?
CVE-2019-14870 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 clien...
How severe is CVE-2019-14870?
CVE-2019-14870 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-14870?
Check the references section above for vendor advisories and patch information. Affected products include: Samba Samba, Fedoraproject Fedora, Canonical Ubuntu Linux, Debian Debian Linux, Opensuse Leap.