Bug 1552717 (CVE-2018-1099)

Summary:	CVE-2018-1099 etcd: DNS rebinding vulnerability in etcd server
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ahardin, bleanhar, ccoleman, dbaker, dedgar, gscrivan, jcajka, jchaloup, jgoulding, jokerman, lacypret, lemenkov, mchappel, rschiron, sisharma
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	etcd 3.4.0	Doc Type:	If docs needed, set a value
Doc Text:	It has been discovered that etcd does not correctly restrict access to resources based on hostname. A remote attacker could perform a DNS-rebinding attack and trick the browser into sending requests to an etcd server on an internal network, bypassing the Same-Origin Policy.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-21 19:56:27 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:	1552720, 1552721, 1553764, 1566227, 1566228, 1590239
Bug Blocks:	1552719

Description Pedro Sampaio 2018-03-07 15:38:43 UTC

etcd 3.3.1 and earlier does not correctly restrict access to resources based on
the hostname, thus allowing a DNS rebinding attack. An attacker can control his
DNS records and trick the browser into sending requests to an etcd server on an
internal network and bypassing the same-origin policy.

Upstream issue:
https://github.com/coreos/etcd/issues/9353

Comment 1 Pedro Sampaio 2018-03-07 15:42:41 UTC

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1552720]

Comment 5 Riccardo Schirone 2018-06-11 09:04:21 UTC

Patch:
https://github.com/coreos/etcd/commit/a7e5790c82039945639798ae9a3289fe787f5e56

Comment 6 Riccardo Schirone 2018-06-12 09:06:40 UTC

Reference:
https://www.twistlock.com/2018/02/28/dear-developers-beware-dns-rebinding/

Comment 7 Riccardo Schirone 2018-06-12 09:39:46 UTC

Mitigation:

Configure and enable authentication on the etcd server or secure your client connection via HTTPS.