ESB-2018.1710 - [Ubuntu] unbound: Multiple vulnerabilities 2018-06-08

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1710
                           Unbound vulnerability
                                8 June 2018

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

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

Product:           unbound
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service              -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-15105  

Reference:         ESB-2018.0218

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3673-1

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Ubuntu Security Notice USN-3673-1
June 07, 2018

unbound 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:

A security issue was fixed in Unbound.

Software Description:
- - unbound: validating, recursive, caching DNS resolver

Details:

Ralph Dolmans and Karst Koymans discovered that Unbound did not properly
handle certain NSEC records. An attacker could use this to to prove the
non-existence (NXDOMAIN answer) of an existing wildcard record, or trick
Unbound into accepting a NODATA proof.

Update instructions:

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

Ubuntu 18.04 LTS:
  libunbound2                     1.6.7-1ubuntu2.1
  unbound                         1.6.7-1ubuntu2.1

Ubuntu 17.10:
  libunbound2                     1.6.5-1ubuntu0.2
  unbound                         1.6.5-1ubuntu0.2

Ubuntu 16.04 LTS:
  libunbound2                     1.5.8-1ubuntu1.1
  unbound                         1.5.8-1ubuntu1.1

Ubuntu 14.04 LTS:
  libunbound2                     1.4.22-1ubuntu4.14.04.3
  unbound                         1.4.22-1ubuntu4.14.04.3

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

References:
  https://usn.ubuntu.com/usn/usn-3673-1
  CVE-2017-15105

Package Information:
  https://launchpad.net/ubuntu/+source/unbound/1.6.7-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/unbound/1.6.5-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/unbound/1.5.8-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/unbound/1.4.22-1ubuntu4.14.04.3

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