Vulnerability identifier: #VU64828

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16886

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
etcd
Server applications / Database software

Vendor: CoreOS

Description

The vulnerability allows a remote user to bypass authentication process.

The vulnerability exists due to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. A remote user can authenticate as user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

etcd: 3.2.0 - 3.3.10

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External links
http://www.securityfocus.com/bid/106540
http://access.redhat.com/errata/RHSA-2019:0237
http://access.redhat.com/errata/RHSA-2019:1352
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
http://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
http://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.