Bug 1317812 - Option to disable particular TLS version and ciphers with pcsd
Summary: Option to disable particular TLS version and ciphers with pcsd
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: pcs
Version: 6.8
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Ivan Devat
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-03-15 09:51 UTC by Radek Steiger
Modified: 2019-11-14 07:36 UTC (History)
12 users (show)

Fixed In Version: pcs-0.9.148-6.el6
Doc Type: Bug Fix
Doc Text:
Cause: There is no possibility to set SSL options and ciphers in pcsd. Consequence: If a vulnerability is found in a particular version of SSL/TLS protocol or a cipher or they are considered weak for other reasons, there is no easy way for users to disable the protocol version or cipher. Fix: Disable RC4 ciphers and TLS lower than 1.2 by default. Add possibility to configure SSL options and ciphers. Result: Weak ciphers are disabled by default. It is possible to set SSL options and ciphers so user can disable weak ciphers in future easily.
Clone Of: 1315652
Environment:
Last Closed: 2016-05-10 19:27:34 UTC
Target Upstream Version:

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System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2197151 0 None None None 2016-03-16 13:29:21 UTC
Red Hat Product Errata RHBA-2016:0739 0 normal SHIPPED_LIVE pcs bug fix update 2016-05-10 22:29:32 UTC

Comment 2 Tomas Jelinek 2016-03-16 08:28:48 UTC 
Patch already in upstream: https://github.com/feist/pcs/commit/727379743e6b30687c0aea2e47f02657cb3ea623
Comment 3 Ivan Devat 2016-03-18 14:47:29 UTC 
On rhel6.8 does not work nmap with --script +ssl-enum-ciphers, so we test it from rhel7 machine.
Let us have nodes vm-rhel-6 (this node testing) and vm-rhel-7 (from this node testing).

Before fix:
[vm-rhel-7 ~] $ nmap -p 2224 -Pn vm-rhel-6 --script +ssl-enum-ciphers |& sed -n '/PORT/,/MAC/p'
PORT     STATE SERVICE 
2224/tcp open  efi-mg
| ssl-enum-ciphers: 
|   SSLv3: No supported ciphers found
|   TLSv1.0: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_SEED_CBC_SHA - strong
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_RSA_WITH_IDEA_CBC_SHA - weak
|       TLS_RSA_WITH_RC4_128_MD5 - strong
|       TLS_RSA_WITH_RC4_128_SHA - strong
|       TLS_RSA_WITH_SEED_CBC_SHA - strong
|     compressors: 
|       NULL
|   TLSv1.1: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_SEED_CBC_SHA - strong
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_RSA_WITH_IDEA_CBC_SHA - weak
|       TLS_RSA_WITH_RC4_128_MD5 - strong
|       TLS_RSA_WITH_RC4_128_SHA - strong
|       TLS_RSA_WITH_SEED_CBC_SHA - strong
|     compressors: 
|       NULL
|   TLSv1.2: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_SEED_CBC_SHA - strong
|       TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA256 - strong
|       TLS_RSA_WITH_AES_128_GCM_SHA256 - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
|       TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_RSA_WITH_IDEA_CBC_SHA - weak
|       TLS_RSA_WITH_RC4_128_MD5 - strong
|       TLS_RSA_WITH_RC4_128_SHA - strong
|       TLS_RSA_WITH_SEED_CBC_SHA - strong
|     compressors: 
|       NULL
|_  least strength: weak
MAC Address: 52:54:00:D5:E7:7D (QEMU Virtual NIC)

After fix:
It is possible to set SSL options and ciphers in /etc/sysconfig/pcsd file. This is with default configuration:
[vm-rhel-7 ~] $ nmap -p 2224 -Pn vm-rhel-6 --script +ssl-enum-ciphers |& sed -n '/PORT/,/MAC/p'
PORT     STATE SERVICE
2224/tcp open  efi-mg
| ssl-enum-ciphers: 
|   TLSv1.2: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_SEED_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_RSA_WITH_AES_128_CBC_SHA256 - strong
|       TLS_RSA_WITH_AES_128_GCM_SHA256 - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
|       TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA - strong
|       TLS_RSA_WITH_IDEA_CBC_SHA - weak
|       TLS_RSA_WITH_SEED_CBC_SHA - strong
|     compressors: 
|       NULL
|_  least strength: weak
MAC Address: 52:54:00:D5:E7:7D (QEMU Virtual NIC)
Comment 7 errata-xmlrpc 2016-05-10 19:27:34 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-2016-0739.html
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