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Bug 1232207 - openssl update breaks mysql ssl
Summary: openssl update breaks mysql ssl
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: mysql
Version: 6.7
Hardware: x86_64
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Jakub Dorňák
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On: 1228755 1231960 1272091
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-06-16 09:45 UTC by Jan Kurik
Modified: 2019-08-15 04:43 UTC (History)
21 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
With certain versions of OpenSSL, using SSL to log into a MySQL client as root previously failed with a "ERROR 2026 (HY000): SSL connection error" message. This update increases the Diffie-Hellman (DH) key length in MySQL from 512 to 1024 bits, which meets the DH key length requirements for these OpenSSL versions. As a result, SSL can be used as expected in the described scenario.
Clone Of: 1228755
Environment:
Last Closed: 2015-06-22 11:14:22 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:1129 0 normal SHIPPED_LIVE mysql bug fix update 2015-07-06 11:54:19 UTC

Description Jan Kurik 2015-06-16 09:45:38 UTC 
This bug has been copied from bug #1228755 and has been proposed
to be backported to 6.6 z-stream (EUS).
Comment 7 errata-xmlrpc 2015-06-22 11:14:22 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-2015-1129.html
Comment 12 Yuhong Bao 2015-08-02 06:33:43 UTC 
Why is this a RHBA and not a RHSA?
Comment 13 Yuhong Bao 2015-08-02 06:56:14 UTC 
Especially as the 512-bit DH group is hardcoded making it trivial to break each connection once the initial work is done.
Comment 14 Martin Prpič 2015-08-05 08:26:02 UTC 
(In reply to Yuhong Bao from comment #12)
> Why is this a RHBA and not a RHSA?

Hi, CVE-2015-4000 (aka Logjam) was assigned by MITRE specifically as a TLS weakness which can lead to the use of export grade ciphers. No other CVEs were assigned. The 512-bit issue can be considered a weakness, that could be exploited only if the prime we shipped was broken. Nevertheless, this issue is not covered under CVE-2015-4000. Since no CVE was assigned for this specific issue, we released the advisory as an RHBA.
Comment 15 Huzaifa S. Sidhpurwala 2015-08-05 08:35:43 UTC 
(In reply to Martin Prpic from comment #14)
> (In reply to Yuhong Bao from comment #12)
> > Why is this a RHBA and not a RHSA?
> 
> Hi, CVE-2015-4000 (aka Logjam) was assigned by MITRE specifically as a TLS
> weakness which can lead to the use of export grade ciphers. No other CVEs
> were assigned. The 512-bit issue can be considered a weakness, that could be
> exploited only if the prime we shipped was broken. Nevertheless, this issue
> is not covered under CVE-2015-4000. Since no CVE was assigned for this
> specific issue, we released the advisory as an RHBA.

To further elaborate. Though 512 bit primes are known as unsafe and can be broken (with computation), this isnt really a vuln. but more of a security hardening.
Comment 16 Yuhong Bao 2015-08-07 04:40:32 UTC 
(In reply to Huzaifa S. Sidhpurwala from comment #15)
> (In reply to Martin Prpic from comment #14)
> > (In reply to Yuhong Bao from comment #12)
> > > Why is this a RHBA and not a RHSA?
> > 
> > Hi, CVE-2015-4000 (aka Logjam) was assigned by MITRE specifically as a TLS
> > weakness which can lead to the use of export grade ciphers. No other CVEs
> > were assigned. The 512-bit issue can be considered a weakness, that could be
> > exploited only if the prime we shipped was broken. Nevertheless, this issue
> > is not covered under CVE-2015-4000. Since no CVE was assigned for this
> > specific issue, we released the advisory as an RHBA.
> 
> To further elaborate. Though 512 bit primes are known as unsafe and can be
> broken (with computation), this isnt really a vuln. but more of a security
> hardening.

The 512-bit prime has to be broken only once, then it takes much less computation to break individual connections and reveal the encryption keys.
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