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Bug 1304812

Summary: Disable support for SSLv2 completely.
Product: Red Hat Enterprise Linux 6 Reporter: Alicja Kario <hkario>
Component: nssAssignee: Elio Maldonado Batiz <emaldona>
Status: CLOSED ERRATA QA Contact: Alicja Kario <hkario>
Severity: unspecified Docs Contact: Jana Heves <jsvarova>
Priority: unspecified    
Version: 6.7CC: emaldona, jsvarova, kengert, ksrot, nmavrogi, rrelyea, thoger
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: nss-3.21.0-5.el6 Doc Type: Release Note
Doc Text:
Support for SSLv2 has been disabled SSLv2 is insecure and should not be used in current deployments, and thus has been disabled without a way to override. All modern browsers and frameworks cannot negotiate SSLv2 connections in default configuration and many cannot be configured to perform SSLv2 negotiation. A recent OpenSSL vulnerability (CVE-2015-3197) shows that keeping this code is a liability. In addition, upstream has already removed support for SSLv2 (MZBZ#1228555).
 Story Points: ---
Clone Of: Environment:
Last Closed: 2016-05-10 21:10:20 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1311981    
Bug Blocks: 1306607    
Attachments:
Description Flags
disable ssl2 suppport - libssl part
none
disable ssl2 support - test scripts part
none
Add "-c v " to tstclnt invocation for ocsp stapling tests and some SNI tests.
none
ensure in ssl stress tool invocation lower protocol in range is ssl3
none
For ssl authentication tests ensure ssl3 is the minimum and not ssl2
none
nss.spec file changes - in patch format none

Description Alicja Kario 2016-02-04 16:58:26 UTC 
Description of problem:
SSLv2 is a protocol known to be insecure for close to 20 years now. Recent OpenSSL vulnerability (CVE-2015-3197) shows that just keeping this code around is a liability. Moreover, upstream plans to remove it soon too: MZBZ#1228555.

Thus support for SSLv2 should be disabled without a way to override.
Comment 10 Elio Maldonado Batiz 2016-03-03 16:02:07 UTC 
Created attachment 1132852 [details]
disable ssl2 suppport - libssl part
Comment 11 Elio Maldonado Batiz 2016-03-03 16:03:49 UTC 
Created attachment 1132853 [details]
disable ssl2 support - test scripts part
Comment 12 Elio Maldonado Batiz 2016-03-03 16:07:52 UTC 
Created attachment 1132855 [details]
Add "-c v " to tstclnt invocation for ocsp stapling tests and some SNI tests.
Comment 13 Elio Maldonado Batiz 2016-03-03 16:13:43 UTC 
Created attachment 1132859 [details]
ensure in ssl stress tool invocation lower protocol in range is ssl3

don't rely on default for minimum wnich is currently ssl2
Comment 14 Elio Maldonado Batiz 2016-03-03 16:17:04 UTC 
Created attachment 1132860 [details]
For ssl authentication tests ensure ssl3 is the minimum and not ssl2
Comment 15 Elio Maldonado Batiz 2016-03-03 16:18:35 UTC 
Created attachment 1132861 [details]
nss.spec file changes - in patch format
Comment 19 errata-xmlrpc 2016-05-10 21:10:20 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/RHBA-2016-0820.html