Ubuntu 17.04: USN-3350-2 Urgent: Libgcrypt Vulnerability Exploitation Risk

ubuntu

July 3, 2017

Several security issues were fixed in Libgcrypt.

Summary

Several security issues were fixed in Libgcrypt.

Software Description:

- libgcrypt20: LGPL Crypto library

- libgcrypt11: LGPL Crypto library

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)

It was discovered that Libgcrypt was susceptible to an attack via

side channels. A local attacker could use this attack to possibly recover

EdDSA private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu

16.10 and Ubuntu 17.04. (CVE-2017-9526)

Topics Covered

security advisory critical ubuntu libgcrypt side channel

Update Instructions

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

Ubuntu 17.04:
  libgcrypt20                     1.7.6-1ubuntu0.1

Ubuntu 16.10:
  libgcrypt20                     1.7.2-2ubuntu1.1

Ubuntu 16.04 LTS:
  libgcrypt20                     1.6.5-2ubuntu0.3

Ubuntu 14.04 LTS:
  libgcrypt11                     1.5.3-2ubuntu4.5

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