Important: openssl security update

Related Vulnerabilities: CVE-2016-6304   CVE-2016-6304   CVE-2016-6304  

Synopsis

Important: openssl security update

Type/Severity

Security Advisory: Important

Topic

An update for openssl is now available for Red Hat Enterprise Linux 6.2 Advanced Update Support, Red Hat Enterprise Linux 6.4 Advanced Update Support, Red Hat Enterprise Linux 6.5 Advanced Update Support, Red Hat Enterprise Linux 6.5 Telco Extended Update Support, Red Hat Enterprise Linux 6.6 Advanced Update Support, Red Hat Enterprise Linux 6.6 Telco Extended Update Support, and Red Hat Enterprise Linux 6.7 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

  • A memory leak flaw was found in the way OpenSSL handled TLS status request extension data during session renegotiation. A remote attacker could cause a TLS server using OpenSSL to consume an excessive amount of memory and, possibly, exit unexpectedly after exhausting all available memory, if it enabled OCSP stapling support. (CVE-2016-6304)

Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Shi Lei (Gear Team of Qihoo 360 Inc.) as the original reporter.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

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

Affected Products

  • Red Hat Enterprise Linux Server - Extended Update Support 6.7 x86_64
  • Red Hat Enterprise Linux Server - Extended Update Support 6.7 i386
  • Red Hat Enterprise Linux EUS Compute Node 6.7 x86_64
  • Red Hat Enterprise Linux Server - AUS 6.6 x86_64
  • Red Hat Enterprise Linux Server - AUS 6.5 x86_64
  • Red Hat Enterprise Linux Server - AUS 6.4 x86_64
  • Red Hat Enterprise Linux Server - AUS 6.2 x86_64
  • Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.7 s390x
  • Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7 ppc64
  • RHEL for SAP HANA - Extended Update Support 6.7 x86_64
  • Red Hat Enterprise Linux Server - TUS 6.6 x86_64
  • Red Hat Enterprise Linux Server - TUS 6.5 x86_64

Fixes

  • BZ - 1377600 - CVE-2016-6304 openssl: OCSP Status Request extension unbounded memory growth

CVEs

References