Bug 1844575

Summary:	OpenSSL will use unsafe FFDH primes with 2048 bit RSA keys
Product:	[Fedora] Fedora	Reporter:	Hubert Kario <hkario>
Component:	openssl	Assignee:	Tomas Mraz <tmraz>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	31	CC:	crypto-team, jorton, tmraz
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Clones:	1844607 (view as bug list)		Environment:
Last Closed:	2020-09-18 15:51:37 UTC	Type:	Bug
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Bug Blocks:	1844607

Description Hubert Kario 2020-06-05 17:11:47 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-1.1.1g-1.fc31.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 ServerKeyExchangeMessage

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


Additional info:

Comment 1 Tomas Mraz 2020-09-18 15:51:37 UTC

Fixed in rawhide and F33.