Date:         Fri, 5 Jun 2015 16:48:46 +0000
Reply-To:     scientific-linux-users@listserv.fnal.gov
Sender:       Security Errata for Scientific Linux
              
From:         Pat Riehecky 
Subject:      Security ERRATA Moderate: openssl on SL6.x, SL7.x i386/x86_64
MIME-Version: 1.0

Synopsis:          Moderate: openssl security update
Advisory ID:       SLSA-2015:1072-1
Issue Date:        2015-06-04
CVE Numbers:       CVE-2015-4000
--

A flaw was found in the way the TLS protocol composes the Diffie-Hellman
(DH) key exchange. A man-in-the-middle attacker could use this flaw to
force the use of weak 512 bit export-grade keys during the key exchange,
allowing them do decrypt all traffic. (CVE-2015-4000)

Note: This update forces the TLS/SSL client implementation in OpenSSL to
reject DH key sizes below 768 bits, which prevents sessions to be
downgraded to export-grade keys. Future updates may raise this limit to
1024 bits.

For the update to take effect, all services linked to the OpenSSL library
must be restarted, or the system rebooted.
--

SL6
  x86_64
    openssl-1.0.1e-30.el6_6.9.i686.rpm
    openssl-1.0.1e-30.el6_6.9.x86_64.rpm
    openssl-debuginfo-1.0.1e-30.el6_6.9.i686.rpm
    openssl-debuginfo-1.0.1e-30.el6_6.9.x86_64.rpm
    openssl-devel-1.0.1e-30.el6_6.9.i686.rpm
    openssl-devel-1.0.1e-30.el6_6.9.x86_64.rpm
    openssl-perl-1.0.1e-30.el6_6.9.x86_64.rpm
    openssl-static-1.0.1e-30.el6_6.9.x86_64.rpm
  i386
    openssl-1.0.1e-30.el6_6.9.i686.rpm
    openssl-debuginfo-1.0.1e-30.el6_6.9.i686.rpm
    openssl-devel-1.0.1e-30.el6_6.9.i686.rpm
    openssl-perl-1.0.1e-30.el6_6.9.i686.rpm
    openssl-static-1.0.1e-30.el6_6.9.i686.rpm
SL7
  x86_64
    openssl-1.0.1e-42.el7_1.6.x86_64.rpm
    openssl-debuginfo-1.0.1e-42.el7_1.6.i686.rpm
    openssl-debuginfo-1.0.1e-42.el7_1.6.x86_64.rpm
    openssl-libs-1.0.1e-42.el7_1.6.i686.rpm
    openssl-libs-1.0.1e-42.el7_1.6.x86_64.rpm
    openssl-devel-1.0.1e-42.el7_1.6.i686.rpm
    openssl-devel-1.0.1e-42.el7_1.6.x86_64.rpm
    openssl-perl-1.0.1e-42.el7_1.6.x86_64.rpm
    openssl-static-1.0.1e-42.el7_1.6.i686.rpm
    openssl-static-1.0.1e-42.el7_1.6.x86_64.rpm

- Scientific Linux Development Team