Bug 2018478 (CVE-2021-3917)

Summary:	CVE-2021-3917 coreos-installer: restrict access permissions on /boot/ignition{,/config.ign}
Product:	[Other] Security Response	Reporter:	Cedric Buissart <cbuissar>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amurdaca, bgilbert, bgilbert, bmontgom, dornelas, dustymabe, eparis, jburrell, jligon, jokerman, jonathan, mrussell, nstielau, rhcos-triage, rust-sig, skunkerk, sponnaga, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	coreos-installer 0.10.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the coreos-installer, where it writes the Ignition config to the target system with world-readable access permissions. This flaw allows a local attacker to have read access to potentially sensitive data. The highest threat from this vulnerability is to confidentiality.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-30 09:52:02 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:	1989544, 2018889, 2021210, 2021285, 2021286, 2021287, 2021288
Bug Blocks:	2018480

Description Cedric Buissart 2021-10-29 12:51:12 UTC

coreos-installer did not have sufficiently restrictive permissions on directories /boot/ignition{,/config.ign}. A local attacker could use this flaw to have read access to potentially sensitive data.

Upstream fix :
https://github.com/coreos/coreos-installer/commit/2a36405339c87b16ed6c76e91ad5b76638fbdb0c

Fixed in version 0.10.0

Comment 1 Cedric Buissart 2021-11-01 08:04:54 UTC

Created rust-coreos-installer tracking bugs for this issue:

Affects: fedora-all [bug 2018889]

Comment 4 juneau 2021-11-02 15:33:05 UTC

Setting OSD "notaffected" per https://bugzilla.redhat.com/show_bug.cgi?id=1989544#c3

Comment 7 errata-xmlrpc 2021-11-30 09:08:59 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.8

Via RHSA-2021:4829 https://access.redhat.com/errata/RHSA-2021:4829

Comment 8 Product Security DevOps Team 2021-11-30 09:52:00 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-2021-3917