CVE-2019-14870: Medium severity Samba Samba vulnerability
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 delegationnotallowed (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.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2019-14870?
CVE-2019-14870 is a vulnerability in Samba that allows for a subset of clients to opt out of constrained delegation.
What is the severity of CVE-2019-14870?
The severity of CVE-2019-14870 is medium, with a CVSS score of 5.4.
Which versions of Samba are affected by CVE-2019-14870?
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 are affected by CVE-2019-14870.
How can I fix CVE-2019-14870?
To fix CVE-2019-14870, you need to update your Samba installation to version 4.9.17, 4.10.11, or 4.11.3.
Where can I find more information about CVE-2019-14870?
You can find more information about CVE-2019-14870 on the CVE website (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14870) and the Samba security page (https://www.samba.org/samba/security/CVE-2019-14870.html).