libgcrypt security update

CentOS Errata and Security Advisory CESA-2013:1457

The libgcrypt library provides general-purpose implementations of various
cryptographic algorithms.

It was found that GnuPG was vulnerable to the Yarom/Falkner flush+reload
cache side-channel attack on the RSA secret exponent. An attacker able to
execute a process on the logical CPU that shared the L3 cache with the
GnuPG process (such as a different local user or a user of a KVM guest
running on the same host with the kernel same-page merging functionality
enabled) could possibly use this flaw to obtain portions of the RSA secret
key. (CVE-2013-4242)

All libgcrypt users are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2013-October/082150.html
https://lists.centos.org/pipermail/centos-announce/2013-October/082154.html

Affected packages:
libgcrypt
libgcrypt-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2013:1457