Bug 1868880 (CVE-2020-15136)

Summary:	CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abishop, bmontgom, dbaker, dbecker, eparis, go-sig, gparvin, gscrivan, hvyas, jburrell, jcajka, jchaloup, jjoyce, jokerman, jramanat, jschluet, jweiser, kbasil, lacypret, lemenkov, lhh, lpeer, mburns, nstielau, puebele, sbatsche, sclewis, slinaber, sponnaga, stcannon, strigazi, tfister, thee
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	etcd 3.4.10, etcd 3.3.23	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in etcd. The gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-17 19:52:14 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1868881, 1870189, 1870508, 1874768, 1874872, 1875653, 1875654, 1881174
Bug Blocks:	1868882

Description Dhananjay Arunesh 2020-08-14 06:23:53 UTC

In etcd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. This has been fixed in versions 3.4.10 and 3.3.23 with improved documentation and deprecation of the functionality.

References:
https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md
https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q

Comment 1 Dhananjay Arunesh 2020-08-14 06:24:50 UTC

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1868881]

Comment 2 Przemyslaw Roguski 2020-08-17 13:38:25 UTC

External References:

https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q

Comment 8 Riccardo Schirone 2020-08-27 15:17:06 UTC

So far only the documentation of "trusted-ca-file" was updated in https://github.com/etcd-io/etcd/commit/b86bb615ffcfc51494566e3cd8b69f8a7b408721.

Comment 13 Przemyslaw Roguski 2020-09-07 06:51:53 UTC

Statement:

In Red Hat OpenShift Container Platform (RHOCP) the affected components are behind OpenShift OAuth authentication. This restricts access to the vulnerable etcd to authenticated users only, therefore the impact by this vulnerability is Low.
A similar access restriction is in place in Red Hat OpenStack Platform (RHOSP) as etcd is limited to use within the internal API network, which is not accessible to any OpenStack tenants. Additionally, RHOSP does not use the etcd gateway.

Comment 15 errata-xmlrpc 2021-03-17 15:30:16 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.1

Via RHSA-2021:0916 https://access.redhat.com/errata/RHSA-2021:0916

Comment 16 Product Security DevOps Team 2021-03-17 19:52:14 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-15136

Comment 17 errata-xmlrpc 2021-07-27 22:31:32 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.8

Via RHSA-2021:2438 https://access.redhat.com/errata/RHSA-2021:2438