CVE-2019-14870

Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 10 Dec 2019, 00:00
Last modified:05 Aug 2024, 00:26

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.4 MEDIUM
v2.0 (nvd)
EPSS Score
4.67% LOW
5% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

10 Dec 2019, 00:00
Published
Vulnerability first disclosed
05 Aug 2024, 00:26
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
  • v3.0•MEDIUM•Score: 5.4CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
  • v2.0•MEDIUM•Score: 6.4AV:N/AC:L/Au:N/C:P/I:P/A:N

EPSS Trends

Current EPSS score: 4.67%• Percentile: 90%

Techniques & Countermeasures

  • CWE-287•Improper Authentication

    When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

  • CWE-285•Improper Authorization

    The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04 | 19.04 | 19.10

  • debian•debian_linux

    9.0 | 10.0

  • fedoraproject•fedora

    30 | 31

  • opensuse•leap

    15.1

  • red hat•samba

    all versions 4.11.x before 4.11.3 | all versions 4.10.x before 4.10.11 | all versions 4.x.x before 4.9.17

  • samba•samba

    ≥ 4.0.0, < 4.9.17 | ≥ 4.10.0, < 4.10.11 | ≥ 4.11.0, < 4.11.3

References (14)