[USN-3347-2] Libgcrypt vulnerability

[Leonidas S. Barbosa]

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Ubuntu Security Notice USN-3347-2
July 17, 2017

libgcrypt11 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Libgcrypt.

Software Description:
- libgcrypt11: LGPL Crypto library

Details:

USN-3347-1 fixed a vulnerability in Libgcrypt. 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 Libgcrypt was susceptible to an attack via
 side channels. A local attacker could use this attack to recover RSA
 private keys. (CVE-2017-7526)

Update instructions:

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

Ubuntu 12.04 ESM:
  libgcrypt11                     1.5.0-3ubuntu0.7

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

References:
  https://www.ubuntu.com/usn/usn-3347-2
  https://www.ubuntu.com/usn/usn-3347-1
  CVE-2017-7526
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