CVE-2018-16886
Published: 14 January 2019
etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.
Notes
| Author | Note |
|---|---|
| msalvatore | Introduced by https://github.com/etcd-io/etcd/commit/0191509637546621d6f2e18e074e955ab8ef374d |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
etcd Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| focal |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| groovy |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| hirsute |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| impish |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| jammy |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| kinetic |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| lunar |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| mantic |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| noble |
Not vulnerable
(3.2.26+dfsg-3)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(3.2.26+dfsg-1)
|
|
| xenial |
Not vulnerable
(code not present)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
- https://github.com/etcd-io/etcd/pull/10366
- https://github.com/etcd-io/etcd/commit/bf9d0d8291dc71ecbfb2690612954e1a298154b2
- https://github.com/etcd-io/etcd/commit/a9a9466fb8ba11ad7bb6a44d7446fbd072d59887
- https://github.com/etcd-io/etcd/commit/99704e2a97e8710da942bdc737417fc9c9a2c03f
- https://github.com/etcd-io/etcd/commit/83c051b701d33261eef91a719e4421c81b000ba4
- https://github.com/etcd-io/etcd/pull/10386 (3.2 backport)
- https://www.cve.org/CVERecord?id=CVE-2018-16886
- NVD
- Launchpad
- Debian