RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1020341 - OCSP responses with MD5withRSA signatures are accepted as secure
Summary: OCSP responses with MD5withRSA signatures are accepted as secure
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: openssl
Version: 7.0
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Tomas Mraz
QA Contact: Hubert Kario
URL:
Whiteboard:
Depends On: 987550
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-10-17 13:23 UTC by Hubert Kario
Modified: 2014-06-18 03:52 UTC (History)
4 users (show)

Fixed In Version: openssl-1.0.1e-24.el7
Doc Type: Bug Fix
Doc Text:
Clone Of: 987550
Environment:
Last Closed: 2014-06-13 11:48:03 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Comment 4 Tomas Mraz 2013-11-13 09:44:07 UTC 
The question is whether we should diverge from upstream on this. Also should it be disabled also for CRL verification?
Comment 5 Hubert Kario 2013-11-13 11:56:26 UTC 
(In reply to Tomas Mraz from comment #4)
> The question is whether we should diverge from upstream on this. Also should
> it be disabled also for CRL verification?

Yes, all three uses for MD5withRSA are vulnerable. OCSP, certificates and CRLs, all of them allow for arbitrary extensions, which are placed as last in the hashed data, so all of them are vulnerable to chosen-prefix collision attacks. MD5 is completely broken for chosen-prefix collision attacks (complexity 2^39).
Comment 6 Tomas Mraz 2013-11-13 12:29:43 UTC 
Does NSS in RHEL-7 disable all these three uses?
Comment 7 Hubert Kario 2013-11-13 12:55:45 UTC 
(In reply to Tomas Mraz from comment #6)
> Does NSS in RHEL-7 disable all these three uses?

Yes, it doesn't trust them by default. See bug 1012656.
Comment 9 Ludek Smid 2014-06-13 11:48:03 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.
Note You need to log in before you can comment on or make changes to this bug.