CVE-2018-16886
High
Description
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Etcd
PublishedJan 14, 2019
First seenJan 14, 2019
Weakness typeCWE-287Improper authentication
How to fix
Update
- etcd etcd3.2.26, 3.3.11 or later
- go.etcd.io/etcd/v33.2.26, 3.3.11 or later
- go.etcd.io/etcd0.5.0-alpha.5.0.20190108173120-83c051b701d3 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2019:0237
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
- access.redhat.com/errata/RHSA-2019:1352
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| etcd etcd | 3.2.0 ≤ v < 3.2.26, 3.3.0 ≤ v < 3.3.11 | 3.2.26, 3.3.11 |
| redhat enterprise_linux_desktop | 7.0 | — |
| redhat enterprise_linux_server | 7.0 | — |
| redhat enterprise_linux_workstation | 7.0 | — |
| fedoraproject fedora | 30 | — |
| go.etcd.io/etcd/v3Go | 3.2.0 ≤ v < 3.2.26, 3.3.0 ≤ v < 3.3.11 | 3.2.26, 3.3.11 |
| go.etcd.io/etcdGo | v < 0.5.0-alpha.5.0.20190108173120-83c051b701d3 | 0.5.0-alpha.5.0.20190108173120-83c051b701d3 |
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