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Bug 2157953 - Support requiring EMS in TLS 1.2, default to it when in FIPS mode
Summary: Support requiring EMS in TLS 1.2, default to it when in FIPS mode
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: gnutls
Version: 9.0
Hardware: Unspecified
OS: Unspecified
high
unspecified
Target Milestone: rc
: ---
Assignee: Daiki Ueno
QA Contact: Alexander Sosedkin
Mirek Jahoda
URL:
Whiteboard:
Depends On:
Blocks: 2227257 2227258
TreeView+ depends on / blocked
 
Reported: 2023-01-03 17:10 UTC by Alicja Kario
Modified: 2023-11-07 11:39 UTC (History)
6 users (show)

Fixed In Version: gnutls-3.7.6-22.el9
Doc Type: Enhancement
Doc Text:
.GnuTLS requires EMS with TLS 1.2 in FIPS mode To comply with the FIPS-140-3 standard, GnuTLS servers and clients require the Extended Master Secret (EMS) extension (RFC 7627) for all TLS 1.2 connections negotiated in FIPS mode. If your scenario requires preserving compatibility with older servers and clients that do not support EMS and you cannot use TLS 1.3, you can apply the `NO-ENFORCE-EMS` system-wide cryptographic subpolicy: ---- # update-crypto-policies --set FIPS:NO-ENFORCE-EMS ---- WARNING: If you allow TLS 1.2 connections without EMS, your system no longer meets the FIPS-140-3 requirements.
Clone Of:
: 2227257 2227258 (view as bug list)
Environment:
Last Closed: 2023-11-07 08:56:09 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Gitlab gnutls gnutls issues 1445 0 None opened Add setting for requiring use of EMS in TLS 1.2 2023-01-03 17:10:06 UTC
Gitlab gnutls gnutls merge_requests 1711 0 None opened priority: add %FORCE_SESSION_HASH modifier 2023-02-21 09:58:23 UTC
Red Hat Issue Tracker CRYPTO-9265 0 None None None 2023-01-12 07:12:39 UTC
Red Hat Issue Tracker RHELPLAN-143563 0 None None None 2023-01-03 17:20:55 UTC
Red Hat Product Errata RHBA-2023:6689 0 None None None 2023-11-07 08:56:13 UTC

Description Alicja Kario 2023-01-03 17:10:07 UTC 
Description of problem:
FIPS 140-3 IG requires that only EMS KDF is in use for TLS 1.2 with modules validated after May 2023.

GnuTLS should have a way to require use of EMS when in FIPS mode.
Comment 26 errata-xmlrpc 2023-11-07 08:56:09 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (gnutls bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6689
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