Bug 1989713

Summary:	OpenSSL client accepts weak (1024 bit) DH parameters with both LEGACY and DEFAULT policy
Product:	Red Hat Enterprise Linux 9	Reporter:	Alicja Kario <hkario>
Component:	openssl	Assignee:	Sahana Prasad <sahana>
Status:	CLOSED ERRATA	QA Contact:	Alicja Kario <hkario>
Severity:	low	Docs Contact:
Priority:	low
Version:	CentOS Stream	CC:	bstinson, dbelyavs, jwboyer
Target Milestone:	beta	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	openssl-3.0.0-5.el9	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-17 15:36:30 UTC	Type:	Bug
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:	2035249
Bug Blocks:

Description Alicja Kario 2021-08-03 18:43:14 UTC

Description of problem:
OpenSSL client doesn't reject 1024 bit DH parameters as too weak when the system is configured with LEGACY or DEFAULT policy

Version-Release number of selected component (if applicable):
openssl-3.0.0-0.beta1.4.el9.x86_64

How reproducible:
always

Steps to Reproduce:
1. Set up a server that uses DHE ciphersuites and 1024 bit DH parameters
2. connect to it with openssl s_client

Actual results:
Connection successful

Expected results:
Connection aborted with error message:
00FCCEC7337F0000:error:0A00018A:SSL routines:tls_process_ske_dhe:dh key too small:ssl/statem/statem_clnt.c:2088:

Additional info:
regression since -alpha16

Comment 2 Dmitry Belyavskiy 2021-12-08 14:08:47 UTC

Server setup:

openssl dhparam 1024 -out dhparam.pem
openssl req -x509 -newkey rsa -keyout server.pem -out cert.pem -subj /CN=localhost -nodes -batch
openssl s_server -cert cert.pem -key server.pem -dhparam dhparam.pem -cipher DHE:@SECLEVEL=1 -www -no_tls1_3

Client setup:
openssl s_client -no_tls1_3 -CAfile cert.pem

Client output:
000003FF80472710:error:0A00018A:SSL routines:tls_process_ske_dhe:dh key too small:ssl/statem/statem_clnt.c:2085:

Comment 12 errata-xmlrpc 2022-05-17 15:36:30 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 (new packages: openssl), 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-2022:3900