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Red Hat 6 & 7 RHSA-2015:1072-01 Moderate: OpenSSL Man-In-The-Middle

red hat
Calendar Grey June 4, 2015
Dist Redhat Esm H88
New OpenSSL updates released for Red Hat Enterprise Linux versions 6 and 7 to address a significant security vulnerability.
Updated openssl packages that fix one security issue are now available for Red Hat Enterprise Linux 6 and 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat moderate severity OpenSSL man-in-the-middle key exchange TLS protocol

References

https://access.redhat.com/security/cve/CVE-2015-4000 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/articles/1456263

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

Read the Full Advisory


Advisory ID: RHSA-2015:1072-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1072.html
Issue date: 2015-06-04

Topic

Updated openssl packages that fix one security issue are now available forRed Hat Enterprise Linux 6 and 7.Red Hat Product Security has rated this update as having Moderate securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory Red Hat moderate severity OpenSSL man-in-the-middle key exchange TLS protocol

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

Bugs Fixed

1223211 - CVE-2015-4000 LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

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