[USN-3733-2] GnuPG vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3733-2
August 15, 2018

gnupg vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

GnuPG could be made to expose sensitive information.

Software Description:
- gnupg: GNU privacy guard - a free PGP replacement

Details:

USN-3733-1 fixed a vulnerability in GnuPG. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
 Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal,
 and Yuval Yarom discovered that GnuPG is vulnerable to a cache side-
 channel attack. A local attacker could use this attack to recover RSA
 private keys.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
  gnupg                           1.4.11-3ubuntu2.12
  gnupg-curl                      1.4.11-3ubuntu2.12
  gpgv                            1.4.11-3ubuntu2.12

In general, a standard system update will make all the necessary
changes.

References:
  https://usn.ubuntu.com/usn/usn-3733-2
  https://usn.ubuntu.com/usn/usn-3733-1
  CVE-2017-7526
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