Bug 1552714 – CVE-2018-1098 etcd: Cross-site request forgery via crafted local POST forms

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Bug 1552714 - (CVE-2018-1098) CVE-2018-1098 etcd: Cross-site request forgery via crafted local POST forms

Summary:	CVE-2018-1098 etcd: Cross-site request forgery via crafted local POST forms

Status:	NEW

Aliases:	CVE-2018-1098

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:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20180307,repor...
Keywords:	Security

Depends On:	1552720 1553763 1590309 1552721 1553762 1566226
Blocks:	1552719
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Reported:	2018-03-07 10:29 EST by Pedro Sampaio
Modified:	2018-06-29 18:34 EDT (History)
CC List:	18 users (show)

See Also:
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.
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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 10:29:46 EST

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 10:42:22 EST

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1552720]

Comment 6 Riccardo Schirone 2018-06-12 05:58:25 EDT

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

Comment 8 Riccardo Schirone 2018-06-12 08:17:11 EDT

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 04:13:19 EDT

Mitigation:

Configure and enable authentication on the etcd server.

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