Bug 1844316 (CVE-2020-10759) - CVE-2020-10759 fwupd: Possible bypass in signature verification
Summary: CVE-2020-10759 fwupd: Possible bypass in signature verification
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-10759
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1844317 1844323 1844324
Blocks: 1844141
TreeView+ depends on / blocked
 
Reported: 2020-06-05 04:15 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-16 19:56 UTC (History)
1 user (show)

Fixed In Version:
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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.
Clone Of:
Environment:
Last Closed: 2020-11-04 02:25:44 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4436 0 None None None 2020-11-04 00:53:14 UTC

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
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