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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:

A Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
A Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal,
and
A Yuval Yarom discovered that Libgcrypt was susceptible to an attack via
A side channels. A local attacker could use this attack to recover RSA
A 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:
A  libgcrypt11A A A A A A A A A A A A A A A A A A A A A 1.5.0-3ubuntu0.7

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

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