Bug 1158767 - RELNOTES - Certificates signed with MD5 algorithm are now rejected
Summary: RELNOTES - Certificates signed with MD5 algorithm are now rejected
Alias: None
Product: Fedora Documentation
Classification: Fedora
Component: release-notes
Version: devel
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Pete Travis
QA Contact: Cristian Ciupitu
Depends On:
Blocks: fc5-relnotes-traqr
TreeView+ depends on / blocked
Reported: 2014-10-30 08:00 UTC by Tomas Mraz
Modified: 2015-05-14 20:14 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-05-14 20:14:40 UTC

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Description Tomas Mraz 2014-10-30 08:00:50 UTC
OpenSSL was patched to disallow verification of certificates that are signed with MD5 algorithm. The use of MD5 hash algorithm for certificate signatures is now considered as insecure and thus all the main crypto libraries in Fedora were patched to reject such certificates.

Certificates signed with MD5 algorithm are not present on public https web sites anymore but they can be still in use on private networks or used for authentication on openvpn based VPNs such as in bug 1157260. It is highly recommended to replace such certificates with new ones signed with SHA256 or at least SHA1. As a temporary measure the OPENSSL_ENABLE_MD5_VERIFY environment variable can be set to allow verification of certificates signed with MD5 algorithm.

Comment 1 Pete Travis 2014-12-06 18:11:59 UTC
Thanks Tomas, noted in https://git.fedorahosted.org/cgit/docs/release-notes.git/commit/?id=b62fd2f437813d9fb95d770a0a0bfce21256fd2a and .  You explained it well, so I shamelessly took your copy :)

Comment 2 Pete Travis 2015-05-14 20:14:40 UTC
This was done!

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