Bug 1552717 – CVE-2018-1099 etcd: DNS rebinding vulnerability in etcd server

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Bug 1552717 - (CVE-2018-1099) CVE-2018-1099 etcd: DNS rebinding vulnerability in etcd server

Summary:	CVE-2018-1099 etcd: DNS rebinding vulnerability in etcd server

Status:	NEW

Aliases:	CVE-2018-1099

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20180307,repor...
Keywords:	Security

Depends On:	1552720 1553764 1590239 1552721 1566227 1566228
Blocks:	1552719
	Show dependency tree / graph

Reported:	2018-03-07 10:38 EST by Pedro Sampaio
Modified:	2018-06-29 18:34 EDT (History)
CC List:	19 users (show)

See Also:
Fixed In Version:
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.
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Regression:	---
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RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2018-03-07 10:38:43 EST

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 10:42:41 EST

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1552720]

Comment 5 Riccardo Schirone 2018-06-11 05:04:21 EDT

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

Comment 6 Riccardo Schirone 2018-06-12 05:06:40 EDT

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

Comment 7 Riccardo Schirone 2018-06-12 05:39:46 EDT

Mitigation:

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

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