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Bug 1989713 - OpenSSL client accepts weak (1024 bit) DH parameters with both LEGACY and DEFAULT policy
Summary: OpenSSL client accepts weak (1024 bit) DH parameters with both LEGACY and DEF...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: openssl
Version: CentOS Stream
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: beta
: ---
Assignee: Sahana Prasad
QA Contact: Alicja Kario
URL:
Whiteboard:
Depends On: 2035249
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-08-03 18:43 UTC by Alicja Kario
Modified: 2022-05-17 15:38 UTC (History)
3 users (show)

Fixed In Version: openssl-3.0.0-5.el9
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-05-17 15:36:30 UTC
Type: Bug
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker CRYPTO-5306 0 None None None 2021-11-15 09:55:52 UTC
Red Hat Issue Tracker RHELPLAN-92209 0 None None None 2021-08-03 18:44:43 UTC
Red Hat Product Errata RHBA-2022:3900 0 None None None 2022-05-17 15:36:48 UTC

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


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