CVE-2019-14870

Publication date 10 December 2019

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.4 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
samba 19.10 eoan
Fixed 2:4.10.7+dfsg-0ubuntu2.3
19.04 disco
Fixed 2:4.10.0+dfsg-0ubuntu2.7
18.04 LTS bionic
Fixed 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
16.04 LTS xenial
Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.24
14.04 LTS trusty

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Severity score breakdown

Parameter Value
Base score 5.4 · Medium
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4217-2
    • Samba vulnerabilities
    • 11 December 2019
    • USN-4217-1
    • Samba vulnerabilities
    • 10 December 2019

Other references