CVE-2019-14870

5.4MEDIUM

Key Information:

Vendor
Red Hat
Status
Samba
Vendor
CVE Published:
10 December 2019

Summary

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.

Affected Version(s)

samba all versions 4.11.x before 4.11.3

samba all versions 4.10.x before 4.10.11

samba all versions 4.x.x before 4.9.17

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
https://usn.ubuntu.com/4217-1/
vendor-advisory
https://security.netapp.com/advisory/ntap-20191210-0002/

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.