CVE-2019-14870
First published: Tue Dec 10 2019(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/heimdal | 7.7.0+dfsg-2+deb11u3 7.8.git20221117.28daf24+dfsg-2 7.8.git20221117.28daf24+dfsg-8 | |
| debian/samba | 2:4.13.13+dfsg-1~deb11u6 2:4.17.12+dfsg-0+deb12u1 2:4.21.0+dfsg-1 | |
| Samba | >=4.0.0<4.9.17 | |
| Samba | >=4.10.0<4.10.11 | |
| Samba | >=4.11.0<4.11.3 | |
| Fedoraproject Fedora | =30 | |
| Fedoraproject Fedora | =31 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Linux | =19.04 | |
| Ubuntu Linux | =19.10 | |
| Debian GNU/Linux | =9.0 | |
| Debian GNU/Linux | =10.0 | |
| openSUSE | =15.1 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
- https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
- https://security.gentoo.org/glsa/202003-52
- https://security.gentoo.org/glsa/202310-06
- https://security.netapp.com/advisory/ntap-20191210-0002/
- https://security.netapp.com/advisory/ntap-20230216-0008/
- https://usn.ubuntu.com/4217-1/
- https://usn.ubuntu.com/4217-2/
- https://www.samba.org/samba/security/CVE-2019-14870.html
- https://www.synology.com/security/advisory/Synology_SA_19_40
- https://launchpad.net/bugs/cve/CVE-2019-14870
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
- https://github.com/heimdal/heimdal/security/advisories/GHSA-q77c-9qvp-qfw4
- https://github.com/heimdal/heimdal/pull/663
- https://github.com/heimdal/heimdal/pull/664
- https://github.com/heimdal/heimdal/commit/0495a19a938ad68283078e62c659e4f1c5980815
- https://github.com/heimdal/heimdal/commit/bdd1d0227720c252771f2db65c31f02bc9fc493c
- https://github.com/heimdal/heimdal/commit/fd43016f2f4b58cf4f0cf3f47b2541f2ab11b2b8
- https://security-tracker.debian.org/tracker/CVE-2019-14870
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14870
- https://nvd.nist.gov/vuln/detail/CVE-2019-14870
- https://ubuntu.com/security/CVE-2019-14870
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).
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