[USN-3673-1] Unbound vulnerability

Steve Beattie steve.beattie at canonical.com
Thu Jun 7 23:42:07 UTC 2018

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


A security issue was fixed in Unbound.

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


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.


Package Information:

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