USN-3347-1: Libgcrypt vulnerabilities

3 July 2017

libgcrypt11, libgcrypt20 vulnerabilities

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

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)

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References