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Bug 2077884 - Small RSA keys work for some operations in FIPS mode
Summary: Small RSA keys work for some operations in FIPS mode
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: openssl
Version: 9.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Dmitry Belyavskiy
QA Contact: Alexander Sosedkin
URL:
Whiteboard:
Depends On:
Blocks: 2077906 2077909 2091938
TreeView+ depends on / blocked
 
Reported: 2022-04-22 13:35 UTC by Hubert Kario
Modified: 2023-06-05 16:08 UTC (History)
6 users (show)

Fixed In Version: openssl-3.0.1-33.el9_0
Doc Type: No Doc Update
Doc Text:
Clone Of:
: 2091938 (view as bug list)
Environment:
Last Closed: 2023-06-05 16:08:34 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
certificates with 1024 bit RSA keys and sha-256 signatures (6.01 KB, application/gzip)
2022-04-22 13:35 UTC, Hubert Kario 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 2053289 1 high CLOSED FIPS provider doesn't block RSA encryption for key transport 2023-10-10 06:44:06 UTC
Red Hat Issue Tracker CRYPTO-7266 0 None None None 2022-05-18 11:59:57 UTC
Red Hat Issue Tracker RHELPLAN-119699 0 None None None 2022-04-22 13:43:20 UTC

Internal Links: 2053289

Description Hubert Kario 2022-04-22 13:35:28 UTC 
Created attachment 1874396 [details]
certificates with 1024 bit RSA keys and sha-256 signatures

Description of problem:
While RHEL-9 disallows keygen of 1024bit RSA keys in FIPS mode, it doesn't disallow verification of signatures made with 1024 bit RSA keys.

Version-Release number of selected component (if applicable):
openssl-3.0.1-21.el9.x86_64

How reproducible:
always

Steps to Reproduce:
1. tar xzf certs.tar.gz
2. openssl verify -CAfile ca/cert.pem server/cert.pem 


Actual results:
server/cert.pem: OK

Expected results:
error because of too small key size

Additional info:
All operations with <2048 bit RSA keys should be disabled in FIPS mode.
Note that the certificates in certs.tar.gz are just examples, the important part are the key sizes, not any other values in them.
Comment 2 Petr Menšík 2022-04-22 13:52:22 UTC 
It is quite sad, because those key lengths are used a lot in ZSK keys in DNSSEC. Quite a lot of them, including in-addr.arpa for all IPv4 reverse resolutions. All those might break once OpenSSL starts refusing it.
Comment 3 Petr Menšík 2022-04-26 18:47:01 UTC 
In order to provide a more proper justification for this action plan, we should comment a response to my question on dnsop mailing list [1]. It provides a good justification validation only can still be allowed. Including reference.

It should be clear in which version this is going to be fixed. It does not seems to be acceptable to fix this bug in 9.0, because it is not a small change. Severity to any DNSSEC validators is very high. It seems to me FIPS certification should allow current state. Any change request should be properly justified, if there is not a way to opt-out.

It seems to me keeping a way for DNSSEC validator to verify shorter keys is very reasonable. Implementing an alternative way in DNS software, which would allow verification of just >=2048 keys is non-trivial. Forcing disabling all validation seems quite against the FIPS purpose.

Providing a custom and downstream only change, which would allow legacy verification in DNSSEC validation software, seems far better option to me.

This seems to me more like a feature change, not a bug. Can you change it to FutureFeature?

1. https://mailarchive.ietf.org/arch/msg/dnsop/ySIyg2w9JDILh0DCo2tZVByyCPE/
Comment 9 Petr Menšík 2022-05-24 10:06:12 UTC 
There is learn.uno. name, which uses 1032 bit ZSK key for .uno. It should not validate under FIPS, but it still does.

This seems to be the only TLD affected.
Comment 13 Clemens Lang 2023-06-05 16:08:34 UTC 
RHEL 9.1 contains openssl-3.0.1-43.el9_0.
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