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Red Hat Enterprise Linux Moderate Advisory RHSA-2015:1185-01 TLS Threat

red hat
Calendar Grey June 25, 2015
Dist Redhat Esm H88
Security update notice for Red Hat concerning nss enhancement tackling potential man-in-the-middle vulnerabilities during TLS key negotiation.
Updated nss and nss-util packages that fix one security issue, several bugs and add various enhancements 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

Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications.
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 NSS 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.
The nss and nss-util packages have been upgraded to upstream versions 3.19.1. The upgraded versions provide a number of bug fixes and enhancements over the previous versions.
Users of nss and nss-util are advised to upgrade to these updated packages, which fix these security flaws, bugs, and add these enhancements.

Topics%20covered

Topics Covered

security advisory update red hat moderate impact man-in-the-middle tls nss

References

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

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: nss-3.19.1-3.el6_6.src.rpm nss-util-3.19.1-1.el6_6.src.rpm
i386: nss-3.19.1-3.el6_6.i686.rpm nss-debuginfo-3.19.1-3.el6_6.i686.rpm nss-sysinit-3.19.1-3.el6_6.i686.rpm nss-tools-3.19.1-3.el6_6.i686.rpm nss-util-3.19.1-1.el6_6.i686.rpm nss-util-debuginfo-3.19.1-1.el6_6.i686.rpm
x86_64: nss-3.19.1-3.el6_6.i686.rpm nss-3.19.1-3.el6_6.x86_64.rpm nss-debuginfo-3.19.1-3.el6_6.i686.rpm nss-debuginfo-3.19.1-3.el6_6.x86_64.rpm nss-sysinit-3.19.1-3.el6_6.x86_64.rpm nss-tools-3.19.1-3.el6_6.x86_64.rpm nss-util-3.19.1-1.el6_6.i686.rpm nss-util-3.19.1-1.el6_6.x86_64.rpm nss-util-debuginfo-3.19.1-1.el6_6.i686.rpm nss-util-debuginfo-3.19.1-1.el6_6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: nss-debuginfo-3.19.1-3.el6_6.i686.rpm nss-devel-3.19.1-3.el6_6.i686.rpm nss-pkcs11-devel-3.19.1-3.el6_6.i686.rpm nss-util-debuginfo-3.19.1-1.el6_6.i686.rpm nss-util-devel-3.19.1-1.el6_6.i686.rpm
x86_64: nss-debuginfo-3.19.1-3.el6_6.i686.rpm nss-debuginfo-3.19.1-3.el6_6.x86_64.rpm nss-devel-3.19.1-3.el6_6.i686.rpm nss-devel-3.19.1-3.el6_6.x86_64.rpm nss-pkcs11-devel-3.19.1-3.el6_6.i686.rpm nss-pkcs11-devel-3.19.1-3.el6_6.x86_64.rpm nss-util-debuginfo-3.19.1-1.el6_6.i686.rpm nss-util-debuginfo-3.19.1-1.el6_6.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2015:1185-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1185.html
Issue date: 2015-06-25

Topic

Updated nss and nss-util packages that fix one security issue, several bugsand add various enhancements are now available for Red Hat Enterprise Linux6 and 7.Red Hat Product Security has rated this update as having Moderate securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.

Topics%20covered

Topics Covered

security advisory update red hat moderate impact man-in-the-middle tls nss

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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