RHEL 5 / 6 : libgcrypt (RHSA-2013:1457)

This script is Copyright (C) 2013-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An updated libgcrypt package that fixes one security issue is now
available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having
moderate security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from
the CVE link in the References section.

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2013-4242.html
http://rhn.redhat.com/errata/RHSA-2013-1457.html

Solution :

Update the affected libgcrypt, libgcrypt-debuginfo and / or
libgcrypt-devel packages.

Risk factor :

Low / CVSS Base Score : 1.9
(CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 1.7
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 70600 ()

Bugtraq ID: 61464

CVE ID: CVE-2013-4242