CVE-2019-14870

Name
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.
NVD Severity
medium
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Vendor Advisory https://www.samba.org/samba/security/CVE-2019-14870.html
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
Third Party Advisory https://security.netapp.com/advisory/ntap-20191210-0002/
Third Party Advisory https://usn.ubuntu.com/4217-1/
Third Party Advisory https://usn.ubuntu.com/4217-2/
Third Party Advisory https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
Third Party Advisory https://www.synology.com/security/advisory/Synology_SA_19_40
SUSE http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
GENTOO https://security.gentoo.org/glsa/202003-52
MLIST https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* samba >= 4.0.0 < 4.9.17
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* samba >= 4.10.0 < 4.10.11
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* samba >= 4.11.0 < 4.11.3

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
heimdal 3.16-main 7.7.1-r0 Leonardo Arena <rnalrd@alpinelinux.org> fixed
heimdal 3.15-main 7.7.1-r0 Leonardo Arena <rnalrd@alpinelinux.org> fixed