Bug 1844316 (CVE-2020-10759)

Summary:	CVE-2020-10759 fwupd: Possible bypass in signature verification
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhughes
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 PGP signature bypass flaw was found in fwupd, which could lead to the installation of unsigned firmware. As per upstream, a signature bypass is theoretically possible, but not practical because the Linux Vendor Firmware Service (LVFS) is either not implemented or enabled in versions of fwupd shipped with Red Hat Enterprise Linux 7 and 8. The highest threat from this vulnerability is to confidentiality and integrity.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:25:44 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:	1844317, 1844323, 1844324
Bug Blocks:	1844141

Description Huzaifa S. Sidhpurwala 2020-06-05 04:15:35 UTC

A PGP signature bypass was found in fwupd, which could lead to possible installation of unsigned firmware.

As per upstream:

* For Red Hat Enterprise Linux 7: LVFS (LVFS (Linux Vendor Firmware Service) is: a secure portal which allows hardware vendors to upload firmware updates. The site is used by all major Linux distributions to provide metadata for clients such as fwupdmgr and GNOME Software.) was never enabled there although the PGP bypass is possible but not implementable.

* For Red Hat Enterprise Linux 8: The LVFS is disabled and never used the Amazon CDN. PGP bypass possible, but not implementable.

More information available at:
https://bugzilla.redhat.com/show_bug.cgi?id=1841462

Comment 1 Huzaifa S. Sidhpurwala 2020-06-05 04:15:40 UTC

Acknowledgments:

Name: Justin Steven

Comment 2 Huzaifa S. Sidhpurwala 2020-06-05 04:16:12 UTC

Created fwupd tracking bugs for this issue:

Affects: fedora-all [bug 1844317]

Comment 5 Huzaifa S. Sidhpurwala 2020-06-09 03:56:12 UTC

External References:

https://github.com/justinsteven/advisories/blob/master/2020_fwupd_dangling_s3_bucket_and_CVE-2020-10759_signature_verification_bypass.md

Comment 6 Huzaifa S. Sidhpurwala 2020-06-09 04:05:02 UTC

Upstream commits:
https://github.com/fwupd/fwupd/commit/21f2d12
https://github.com/hughsie/libjcat/commit/839b89f

Comment 7 errata-xmlrpc 2020-11-04 00:53:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4436 https://access.redhat.com/errata/RHSA-2020:4436

Comment 8 Product Security DevOps Team 2020-11-04 02:25:44 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-2020-10759