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List:       oss-security
Subject:    [oss-security] CVE-2018-16886 etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via g
From:       Paul Harvey <pharvey () redhat ! com>
Date:       2019-01-14 3:43:58
Message-ID: CAEnKrMFsdZJvpeipoVYFKGfRtPpUSA6ccEVNTtbVYf35euN8MQ () mail ! gmail ! com
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Hello,

etcd versions 3.2.0 through 3.3.10 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.

Upstream issue:
https://github.com/etcd-io/etcd/pull/10366

Upstream changelog:
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
 https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication


This issue was reported by Matt Wheeler (Osirium)

-- 
Paul Harvey / Red Hat Product Security


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