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Bug 1844607 - OpenSSL will use unsafe FFDH primes with 2048 bit RSA keys
Summary: OpenSSL will use unsafe FFDH primes with 2048 bit RSA keys
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: openssl
Version: 8.2
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: 8.3
Assignee: Tomas Mraz
QA Contact: Hubert Kario
URL:
Whiteboard:
Depends On: 1844575
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-06-05 18:35 UTC by Hubert Kario
Modified: 2020-11-04 01:55 UTC (History)
4 users (show)

Fixed In Version: openssl-1.1.1g-8.el8
Doc Type: Bug Fix
Doc Text:
OpenSSL will use safe primes in automatically selected DH parameters Previous versions of OpenSSL configured to automatically select Diffie-Hellman parameters in Transport Layer Security (TLS) connection would use group 22 and group 23 from RFC 5114 when configured with 1024 bit or 2048 bit RSA keys. As those groups use primes with known small subgroups, some implementations may reject them (like OpenSSL from RHEL 8.3 working in FIPS mode). This change makes OpenSSL select known safe primes defined in RFC 2409 and RFC 3526.
Clone Of: 1844575
Environment:
Last Closed: 2020-11-04 01:54:39 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github openssl openssl issues 12060 0 None closed Insecure DH parameters selected by default 2020-09-22 12:53:04 UTC
Red Hat Product Errata RHSA-2020:4514 0 None None None 2020-11-04 01:54:43 UTC

Description Hubert Kario 2020-06-05 18:35:21 UTC 
Description of problem:
When openssl s_server is configured with 2048 bit RSA keys and a DHE cipher is negotiated, it will use the RFC5114 group 23.

Version-Release number of selected component (if applicable):
openssl-1.1.1c-15.el8_2.x86_64

How reproducible:
always

Steps to Reproduce:
1. generate 2048 bit keys
2. connect client to server, force negotiation of DHE ciphers

Actual results:
Server proposes RFC 5114 group 23 in ServerKeyExchange message

Expected results:
Server should select one of the parameters that use safe primes, from either RFC 3526 or RFC 7919


Additional info:
Comment 7 errata-xmlrpc 2020-11-04 01:54:39 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 (Low: openssl security, 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/RHSA-2020:4514
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