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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1795
                          Libgcrypt vulnerability
                               20 June 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libgcrypt
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0495  

Reference:         ESB-2018.1780
                   ESB-2018.1766

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3689-1
   http://www.ubuntu.com/usn/usn-3689-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
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

- ----------------------------------------------------------------------------

==========================================================================
Ubuntu Security Notice USN-3689-2
June 19, 2018

libgcrypt11 vulnerability
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- - libgcrypt11: LGPL Crypto library

Details:

USN-3689-1 fixed a vulnerability in Libgcrypt. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory 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 12.04 ESM:
  libgcrypt11                     1.5.0-3ubuntu0.8

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

References:
  https://usn.ubuntu.com/usn/usn-3689-2
  https://usn.ubuntu.com/usn/usn-3689-1
  CVE-2018-0495

- --------------------------END INCLUDED TEXT--------------------

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