CVE-2019-14870
10.12.2019, 23:15
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.Enginsight
| Vendor | Product | Version |
|---|---|---|
| samba | samba | 4.0.0 ≤ 𝑥 < 4.9.17 |
| samba | samba | 4.10.0 ≤ 𝑥 < 4.10.11 |
| samba | samba | 4.11.0 ≤ 𝑥 < 4.11.3 |
| canonical | ubuntu_linux | 14.04 |
| canonical | ubuntu_linux | 16.04 |
| canonical | ubuntu_linux | 18.04 |
| canonical | ubuntu_linux | 19.04 |
| canonical | ubuntu_linux | 19.10 |
| debian | debian_linux | 9.0 |
| debian | debian_linux | 10.0 |
| opensuse | leap | 15.1 |
𝑥
= Vulnerable software versions
Debian Releases
Debian Product | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| heimdal |
| ||||||||||||||||||
| samba |
|
Ubuntu Releases
Common Weakness Enumeration
- CWE-285 - Improper AuthorizationThe software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
- CWE-287 - Improper AuthenticationWhen an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
References