DEBIAN-CVE-2019-14870

Advisory lineage Upstream: 1 Downstream: 2
Upstream
CVE-2019-14870
Published: 10 Dec 2019, 23:15
Last modified:28 Apr 2026, 20:20

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.4 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

10 Dec 2019, 23:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:20
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Systems

  • debian•heimdal

    < 7.7.0+dfsg-1 | < 7.7.0+dfsg-1 | < 7.7.0+dfsg-1 | < 7.7.0+dfsg-1

  • debian•samba

    < 2:4.11.3+dfsg-1 | < 2:4.11.3+dfsg-1 | < 2:4.11.3+dfsg-1 | < 2:4.11.3+dfsg-1

References (1)