Veracode Vulnerability DatabaseVERACODE:30755Denial Of Service (DoS)
EPSS
Percentile
62.1%
All Samba 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.
References
lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html
bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
lists.debian.org/debian-lts-announce/2021/05/msg00023.html
lists.fedoraproject.org/archives/list/[email protected]/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
lists.fedoraproject.org/archives/list/[email protected]/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
security-tracker.debian.org/tracker/CVE-2019-14870
security.gentoo.org/glsa/202003-52
security.netapp.com/advisory/ntap-20191210-0002/
usn.ubuntu.com/4217-1/
usn.ubuntu.com/4217-2/
www.samba.org/samba/security/CVE-2019-14870.html
www.synology.com/security/advisory/Synology_SA_19_40
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