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[Launchpad Bug Tracker <1186662@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu1

---------------
isc-dhcp (4.3.3-5ubuntu1) xenial; urgency=medium

  * Merge from Debian unstable. Remaining changes:
    - Apparmor profiles for dhclient and dhcpd.
    - Create user/group dhcpd.
    - Create /etc/dhcp/ddns-keys/ for DDNS updates.
    - Sanitize environment in dhclient-script.linux.
    - Wait for /etc/resolv.conf to be writable in dhclient-script.linux.
    - If /etc/ltsp/dhcpd.conf exists, use that instead of /etc/dhcp/dhcpd.conf
    - Add an 'option subnet-mask' example to config.
    - Increase the timeout to 300 seconds for dhclient.conf (following the
      default added by dhclient-safer-timeout).
    - Apport hook for isc-dhcp-client and isc-dhcp-server.
    - Upstart jobs for isc-dhcp-server, isc-dhcp-server6, isc-dhcp-relay and
      isc-dhcp-relay6.
    - Separate default file for isc-dhcp-relay6.
    - Drop isc-dhcp-server/new_auth_behavior question from high to medium
    - Remaining Ubuntu patches:
      + dhclient-fix-backoff
      + revert-next-server.
      + multi-ip-addr-per-if.
      + dhclient-safer-timeout.
      + onetry_retry_after_initial_success.
      + dhcp-getifaddrs.patch
      + dhcp-lpf-ib.patch
      + dhcp-improved-xid.patch
      + dhcp-gpxe-cid.patch
      + dhcp-improved-xid-correct-byte-order.patch
      + CVE-2015-8605.patch
  * debian/patches/CVE-2015-8605.patch: refreshed for 4.3.3.
  * debian/patches/system-bind.patch: add -lirs-export to linking libraries
    for dhclient, dhcpd, omshell and dhcrelay since omapip now requires it.
  * debian/isc-dhcp-server*.{upstart,service}: don't chown lease files, since
    the permissions handling in paranoia mode is now done correctly so that
    dhcpd can rotate them. (LP: #1186662)

 -- Mathieu Trudel-Lapierre <mathieu-tl@xxxxxxxxxx>  Wed, 13 Jan 2016
15:41:45 -0500

** Changed in: isc-dhcp (Ubuntu)
       Status: Triaged => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-8605

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https://bugs.launchpad.net/bugs/1186662

Title:
  isc-dhcp-server fails to renew lease file

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Trusty:
  Confirmed

Bug description:
  After raring upgrade, the dhcp server fails to renew lease file when
  it tries to (about every hour).

  The syslog says:
  dhcpd: Can't create new lease file: Permission denied

  It looks like a permission problem, because

  # chown -R dhcpd:dhcpd /var/lib/dhcp

  the above command temporarily solves the issue, until dhcpd is
  restarted: at that time, the ownership of the directory and the lease
  file is set back to root:root.

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