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Ubuntu Security Notice USN-3689-1

Ubuntu Security Notice USN-3689-1
Posted Jun 19, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3689-1 - Keegan Ryan discovered that Libgcrypt was susceptible to a side-channel attack. A local attacker could possibly use this attack to recover ECDSA private keys.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2018-0495
SHA-256 | 88555ac1dd1d49a8d5c958883feb730a625259656c33ee350e93c19be692fc93

Ubuntu Security Notice USN-3689-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3689-1
June 19, 2018

libgcrypt11, libgcrypt20 vulnerability
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library
- libgcrypt11: LGPL Crypto library

Details:

Keegan Ryan discovered that Libgcrypt was susceptible to a side-channel
attack. A local attacker could possibly use this attack to recover ECDSA
private keys.

Update instructions:

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

Ubuntu 18.04 LTS:
libgcrypt20 1.8.1-4ubuntu1.1

Ubuntu 17.10:
libgcrypt20 1.7.8-2ubuntu1.1

Ubuntu 16.04 LTS:
libgcrypt20 1.6.5-2ubuntu0.5

Ubuntu 14.04 LTS:
libgcrypt11 1.5.3-2ubuntu4.6

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

References:
https://usn.ubuntu.com/usn/usn-3689-1
CVE-2018-0495

Package Information:
https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.1-4ubuntu1.1
https://launchpad.net/ubuntu/+source/libgcrypt20/1.7.8-2ubuntu1.1
https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.5-2ubuntu0.5
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.3-2ubuntu4.6

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