Bug 1552714 (CVE-2018-1098)

Summary:	CVE-2018-1098 etcd: Cross-site request forgery via crafted local POST forms
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, sisharma
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A cross-site request forgery flaw has been discovered in etcd. A remote attacker could set up a malicious website that execute POST requests to an etcd server to modify or add a key.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-21 19:56:17 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, 1553762, 1553763, 1566226, 1590309
Bug Blocks:	1552719

Description Pedro Sampaio 2018-03-07 15:29:46 UTC

A cross-site request forgery flaw was found in etcd 3.3.1 and earlier. An attacker can set up a website that tries to send a POST request to the etcd server and modify a key. Adding a key is done with PUT so it is theoretically safe (can't PUT from an HTML form or such) but POST allows creating in-order keys that an attacker can send.

Upstream bug:

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

Comment 1 Pedro Sampaio 2018-03-07 15:42:22 UTC

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1552720]

Comment 6 Riccardo Schirone 2018-06-12 09:58:25 UTC

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

Comment 8 Riccardo Schirone 2018-06-12 12:17:11 UTC

If etcd supports the new v3 API, the attacker can run more operations through POST, as described in the reference blog post.

Comment 11 Riccardo Schirone 2018-06-19 08:13:19 UTC

Mitigation:

Configure and enable authentication on the etcd server.