Red Hat Security Advisory 2015-1072-01 - OpenSSL is a toolkit that implements the Secure Sockets Layer and Transport Layer Security protocols, as well as a full-strength, general purpose cryptography library. A flaw was found in the way the TLS protocol composes the Diffie-Hellman 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. 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.
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=====================================================================
Red Hat Security Advisory
Synopsis: Moderate: openssl security update
Advisory ID: RHSA-2015:1072-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1072.html
Issue date: 2015-06-04
CVE Names: CVE-2015-4000
=====================================================================
1. Summary:
Updated openssl packages that fix one security issue are now available for
Red Hat Enterprise Linux 6 and 7.
Red Hat Product Security has rated this update as having Moderate security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
3. Description:
OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.
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.
All openssl users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. For the update to take
effect, all services linked to the OpenSSL library must be restarted, or
the system rebooted.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
5. Bugs fixed (https://bugzilla.redhat.com/):
1223211 - CVE-2015-4000 LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
openssl-1.0.1e-30.el6_6.9.src.rpm
i386:
openssl-1.0.1e-30.el6_6.9.i686.rpm
openssl-debuginfo-1.0.1e-30.el6_6.9.i686.rpm
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
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386:
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
x86_64:
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
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
openssl-1.0.1e-30.el6_6.9.src.rpm
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
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64:
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
Red Hat Enterprise Linux Server (v. 6):
Source:
openssl-1.0.1e-30.el6_6.9.src.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
ppc64:
openssl-1.0.1e-30.el6_6.9.ppc.rpm
openssl-1.0.1e-30.el6_6.9.ppc64.rpm
openssl-debuginfo-1.0.1e-30.el6_6.9.ppc.rpm
openssl-debuginfo-1.0.1e-30.el6_6.9.ppc64.rpm
openssl-devel-1.0.1e-30.el6_6.9.ppc.rpm
openssl-devel-1.0.1e-30.el6_6.9.ppc64.rpm
s390x:
openssl-1.0.1e-30.el6_6.9.s390.rpm
openssl-1.0.1e-30.el6_6.9.s390x.rpm
openssl-debuginfo-1.0.1e-30.el6_6.9.s390.rpm
openssl-debuginfo-1.0.1e-30.el6_6.9.s390x.rpm
openssl-devel-1.0.1e-30.el6_6.9.s390.rpm
openssl-devel-1.0.1e-30.el6_6.9.s390x.rpm
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
Red Hat Enterprise Linux Server Optional (v. 6):
i386:
openssl-debuginfo-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
ppc64:
openssl-debuginfo-1.0.1e-30.el6_6.9.ppc64.rpm
openssl-perl-1.0.1e-30.el6_6.9.ppc64.rpm
openssl-static-1.0.1e-30.el6_6.9.ppc64.rpm
s390x:
openssl-debuginfo-1.0.1e-30.el6_6.9.s390x.rpm
openssl-perl-1.0.1e-30.el6_6.9.s390x.rpm
openssl-static-1.0.1e-30.el6_6.9.s390x.rpm
x86_64:
openssl-debuginfo-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
Red Hat Enterprise Linux Workstation (v. 6):
Source:
openssl-1.0.1e-30.el6_6.9.src.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
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
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386:
openssl-debuginfo-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
x86_64:
openssl-debuginfo-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
Red Hat Enterprise Linux Client (v. 7):
Source:
openssl-1.0.1e-42.el7_1.6.src.rpm
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
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64:
openssl-debuginfo-1.0.1e-42.el7_1.6.i686.rpm
openssl-debuginfo-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
Red Hat Enterprise Linux ComputeNode (v. 7):
Source:
openssl-1.0.1e-42.el7_1.6.src.rpm
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
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64:
openssl-debuginfo-1.0.1e-42.el7_1.6.i686.rpm
openssl-debuginfo-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
Red Hat Enterprise Linux Server (v. 7):
Source:
openssl-1.0.1e-42.el7_1.6.src.rpm
ppc64:
openssl-1.0.1e-42.el7_1.6.ppc64.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.ppc.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.ppc64.rpm
openssl-devel-1.0.1e-42.el7_1.6.ppc.rpm
openssl-devel-1.0.1e-42.el7_1.6.ppc64.rpm
openssl-libs-1.0.1e-42.el7_1.6.ppc.rpm
openssl-libs-1.0.1e-42.el7_1.6.ppc64.rpm
s390x:
openssl-1.0.1e-42.el7_1.6.s390x.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.s390.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.s390x.rpm
openssl-devel-1.0.1e-42.el7_1.6.s390.rpm
openssl-devel-1.0.1e-42.el7_1.6.s390x.rpm
openssl-libs-1.0.1e-42.el7_1.6.s390.rpm
openssl-libs-1.0.1e-42.el7_1.6.s390x.rpm
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-devel-1.0.1e-42.el7_1.6.i686.rpm
openssl-devel-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
Red Hat Enterprise Linux Server (v. 7):
Source:
openssl-1.0.1e-42.ael7b_1.6.src.rpm
ppc64le:
openssl-1.0.1e-42.ael7b_1.6.ppc64le.rpm
openssl-debuginfo-1.0.1e-42.ael7b_1.6.ppc64le.rpm
openssl-devel-1.0.1e-42.ael7b_1.6.ppc64le.rpm
openssl-libs-1.0.1e-42.ael7b_1.6.ppc64le.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64:
openssl-debuginfo-1.0.1e-42.el7_1.6.ppc.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.ppc64.rpm
openssl-perl-1.0.1e-42.el7_1.6.ppc64.rpm
openssl-static-1.0.1e-42.el7_1.6.ppc.rpm
openssl-static-1.0.1e-42.el7_1.6.ppc64.rpm
s390x:
openssl-debuginfo-1.0.1e-42.el7_1.6.s390.rpm
openssl-debuginfo-1.0.1e-42.el7_1.6.s390x.rpm
openssl-perl-1.0.1e-42.el7_1.6.s390x.rpm
openssl-static-1.0.1e-42.el7_1.6.s390.rpm
openssl-static-1.0.1e-42.el7_1.6.s390x.rpm
x86_64:
openssl-debuginfo-1.0.1e-42.el7_1.6.i686.rpm
openssl-debuginfo-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
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64le:
openssl-debuginfo-1.0.1e-42.ael7b_1.6.ppc64le.rpm
openssl-perl-1.0.1e-42.ael7b_1.6.ppc64le.rpm
openssl-static-1.0.1e-42.ael7b_1.6.ppc64le.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
openssl-1.0.1e-42.el7_1.6.src.rpm
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-devel-1.0.1e-42.el7_1.6.i686.rpm
openssl-devel-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
Red Hat Enterprise Linux Workstation Optional (v. 7):
x86_64:
openssl-debuginfo-1.0.1e-42.el7_1.6.i686.rpm
openssl-debuginfo-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
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2015-4000
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/articles/1456263
https://www.openssl.org/blog/blog/2015/05/20/logjam-freak-upcoming-changes/
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2015 Red Hat, Inc.
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