Is CVE-2019-14870 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 3%.

What products does CVE-2019-14870 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2019-14870?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

CVE-2019-14870

Q: What is CVE-2019-14870?

CVE-2019-14870 is a medium-severity software vulnerability (CWE-285) with a CVSS score of 5.4. 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 delega

MEDIUM severity · CVSS 5.4 · CWE-285

5.4CVSS MEDIUM

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactLow

Integrity impactLow

Availability impactNone

Exploit probability (EPSS)3%

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

CVE-2019-14870

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information