Bug 1934261 (CVE-2021-20269)

Summary:	CVE-2021-20269 kexec-tools: incorrect permissions on kdump dmesg file
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bdettelb, bhe, bhu, kdump-bugs, kernel-mgr, qzhao, ruyang, tomckay, williams, wmealing
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the permissions of a log file created by kexec-tools. This flaw allows a local unprivileged user to read this file and leak kernel internal information from a previous panic. The highest threat from this vulnerability is to confidentiality.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 19:22:39 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:	1937605, 1937611, 1937612, 1937613, 1937614, 1938165
Bug Blocks:	1934262, 1972610

Description Guilherme de Almeida Suckevicz 2021-03-02 19:17:21 UTC

When there is a crash on the system, kdump generates the dmesg file with incorrect permissions.

Comment 3 Wade Mealing 2021-03-11 06:26:49 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1937605]

Comment 5 Wade Mealing 2021-03-11 07:00:30 UTC

Created kexec-tools tracking bugs for this issue:

Affects: fedora-all [bug 1937614]

Comment 9 RaTasha Tillery-Smith 2021-03-11 13:06:06 UTC

Mitigation:

The kexec service can be disabled until the kexec-tools package are updated on the system. No reboot is required for these changes to take effect.

Comment 13 errata-xmlrpc 2021-11-09 18:38:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4404 https://access.redhat.com/errata/RHSA-2021:4404

Comment 14 Product Security DevOps Team 2021-11-09 19:22:36 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-2021-20269