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Red Hat 6,7: RHSA-2016-0012-01 Moderate: TLS MD5 DoS Threat

red hat
Calendar Grey January 8, 2016
Scroller Redhat
Red Hat has released an update for gnutls, aimed at mitigating a significant security vulnerability that could lead to denial-of-service (DoS) incidents and compromise TLS integrity.
Updated gnutls 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

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS).
A flaw was found in the way TLS 1.2 could use the MD5 hash function for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker able to force a TLS connection to use the MD5 hash function could use this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575)
All gnutls 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 applications linked to the GnuTLS library must be restarted.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat DoS gnutls TLS

References

https://access.redhat.com/security/cve/CVE-2015-7575 https://access.redhat.com/security/updates/classification#moderate https://access.redhat.com/articles/2112261

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: gnutls-2.8.5-19.el6_7.src.rpm
i386: gnutls-2.8.5-19.el6_7.i686.rpm gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-utils-2.8.5-19.el6_7.i686.rpm
x86_64: gnutls-2.8.5-19.el6_7.i686.rpm gnutls-2.8.5-19.el6_7.x86_64.rpm gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-debuginfo-2.8.5-19.el6_7.x86_64.rpm gnutls-utils-2.8.5-19.el6_7.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-devel-2.8.5-19.el6_7.i686.rpm gnutls-guile-2.8.5-19.el6_7.i686.rpm
x86_64: gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-debuginfo-2.8.5-19.el6_7.x86_64.rpm gnutls-devel-2.8.5-19.el6_7.i686.rpm gnutls-devel-2.8.5-19.el6_7.x86_64.rpm gnutls-guile-2.8.5-19.el6_7.i686.rpm gnutls-guile-2.8.5-19.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: gnutls-2.8.5-19.el6_7.src.rpm
x86_64: gnutls-2.8.5-19.el6_7.i686.rpm gnutls-2.8.5-19.el6_7.x86_64.rpm gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-debuginfo-2.8.5-19.el6_7.x86_64.rpm gnutls-utils-2.8.5-19.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: gnutls-debuginfo-2.8.5-19.el6_7.i686.rpm gnutls-debuginfo-2.8.5-19.el6_7.x86_64.rpm gnutls-devel-2.8.5-19.el6_7.i686.rpm gnutls-devel-2.8.5-19.el6_7.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2016:0012-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0012.html
Issue date: 2016-01-07

Topic

Updated gnutls 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 moderate security update Red Hat DoS gnutls TLS

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 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

Bugs Fixed

1289841 - CVE-2015-7575 TLS 1.2 Transcipt Collision attacks against MD5 in key exchange protocol (SLOTH)

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