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Bug 1337463 - Disable/remove export ciphersuites in NSS
Summary: Disable/remove export ciphersuites in NSS
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: nss
Version: 6.9
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Daiki Ueno
QA Contact: Hubert Kario
Mirek Jahoda
URL:
Whiteboard:
Depends On:
Blocks: 1335911 1343211
TreeView+ depends on / blocked
 
Reported: 2016-05-19 09:21 UTC by Nikos Mavrogiannopoulos
Modified: 2017-03-21 10:26 UTC (History)
5 users (show)

Fixed In Version: nss-3.27.1-1.el6
Doc Type: Deprecated Functionality
Doc Text:
The EXPORT cipher suites in *NSS* are deprecated This change removes support for the EXPORT cipher suites in the Network Security Services (NSS) library. Disabling the weak cipher suites prevents attacks such as the FREAK attack. The EXPORT cipher suites are not required in any *TLS* protocol configuration.
Clone Of:
Environment:
Last Closed: 2017-03-21 10:26:53 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1001841 0 unspecified CLOSED Disable SSL2 and the export cipher suites 2021-02-22 00:41:40 UTC
Red Hat Bugzilla 1337461 0 unspecified CLOSED Disable/remove export ciphersuites in OpenSSL 2021-02-22 00:41:40 UTC
Red Hat Product Errata RHEA-2017:0671 0 normal SHIPPED_LIVE nspr and nss bug fix update 2017-03-21 12:35:29 UTC

Internal Links: 1001841 1337461

Description Nikos Mavrogiannopoulos 2016-05-19 09:21:51 UTC 
RHEL includes several cryptographic components who's security doesn't remain constant over time. Algorithms such as (cryptographic) hashing and encryption typically have a lifetime after which they are considered either too risky to use or plain insecure. That would mean we need to phase out such algorithms from the default settings, or completely disable if they could cause irreparable issue. 

This bug is about disabling by default and removing the ability to negotiate the marked as EXPORT ciphersuites. It should not be possible by applications to inadvertently enable them.
Comment 4 Kai Engert (:kaie) (inactive account) 2016-09-30 09:22:18 UTC 
(In reply to Nikos Mavrogiannopoulos from comment #0)
> This bug is about disabling by default and removing the ability to negotiate
> the marked as EXPORT ciphersuites. It should not be possible by applications
> to inadvertently enable them.

Nikos, it's not clear to me what "not possible to inadvertently enable" mean.

Does that mean, you want to completely remove the ability to enable them?
Comment 5 Nikos Mavrogiannopoulos 2016-09-30 09:35:43 UTC 
Yes, the bug is about removing any possibility of negotiating them.
Comment 6 Kai Engert (:kaie) (inactive account) 2016-09-30 10:21:19 UTC 
Ok. In my understanding, upstream NSS 3.27 still allows the application to enable the export ciphersuites.

This means, we require a downstream patch to make it impossible to enable them.
Comment 7 Kai Engert (:kaie) (inactive account) 2016-09-30 10:25:34 UTC 
I believe Elio has done this work already for RHEL 7.x

We should check which patches from rhel-7.3 are required, and merge them to rhel-6.9
Comment 8 Daiki Ueno 2016-09-30 11:16:44 UTC 
I suppose the relevant patches are:
http://pkgs.devel.redhat.com/cgit/rpms/nss/tree/Bug-1001841-disable-sslv2-libssl.patch?h=rhel-7.3
http://pkgs.devel.redhat.com/cgit/rpms/nss/tree/Bug-1001841-disable-sslv2-tests.patch?h=rhel-7.3
Comment 9 Kai Engert (:kaie) (inactive account) 2016-10-07 16:11:35 UTC 
Yes, the patches mentioned in comment 8 look right.

I don't know if there's anything that might be required.

Hubert, will your tests tell us if we have correctly disabled all ciphers?
Comment 10 Hubert Kario 2016-10-10 11:05:18 UTC 
yes, I have a test case which checks what ciphers and in which order are sent by tstsclnt by default
Comment 16 errata-xmlrpc 2017-03-21 10:26:53 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, 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://rhn.redhat.com/errata/RHEA-2017-0671.html
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