CVE-2019-14870

2019-12-1000:00:00

CWE-285

redhat

www.cve.org

5.4 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

5.9 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

62.1%

JSON

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.

CNA Affected

[
  {
    "vendor": "Red Hat",
    "product": "samba",
    "versions": [
      {
        "version": "all versions 4.11.x before 4.11.3",
        "status": "affected"
      },
      {
        "version": "all versions 4.10.x before 4.10.11",
        "status": "affected"
      },
      {
        "version": "all versions 4.x.x before 4.9.17",
        "status": "affected"
      }
    ]
  }
]