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CVE-2019-14870 PUBLISHED

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.

EPSS 4.67% · 89.2th percentile

Risk Scores

EPSS Score
4.67%
89.2th percentile

Affected Products

VendorProductVersions
Ubuntu:16.04:LTSsamba0, *, *
Ubuntu:18.04:LTSsamba*, *, 0
Ubuntu:Pro:14.04:LTSsamba2:4.3.11+dfsg-0ubuntu0.14.04.7, 2:4.3.11+dfsg-0ubuntu0.14.04.6, 2:4.3.11+dfsg-0ubuntu0.14.04.4

Timeline

References

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