ntp-4.2.6p5-5.0.1.AXS4

The Network Time Protocol (NTP) is used to synchronize a computer's
time with another reference time source. This package includes ntpd
(a daemon which continuously adjusts system time) and utilities used
to query and configure the ntpd daemon.

Perl scripts ntp-wait and ntptrace are in the ntp-perl package and
the ntpdate program is in the ntpdate package. The documentation is
in the ntp-doc package.

Security issues fixed with this release:

CVE-2014-9297
CVE-2014-9298
CVE-2015-1798
CVE-2015-1799
CVE-2015-3405

Fixed bugs:

* The ntpd daemon truncated symmetric keys specified in the key file to 20
bytes. As a consequence, it was impossible to configure NTP authentication to
work with peers that use longer keys. To fix this bug, the maximum length of keys
has now been changed to 32 bytes.
* The ntp-keygen utility used the exponent of 3 when generating RSA keys, and
generating RSA keys failed when FIPS mode was enabled. ntp-keygen has been
modified to use the exponent of 65537, and generating keys in FIPS mode now
works as expected.
* The ntpd daemon included a root delay when calculating its root dispersion.
Consequently, the NTP server reported larger root dispersion than it should have
and clients could reject the source when its distance reached the maximum
synchronization distance (1.5 seconds by default). Calculation of root
dispersion has been fixed, the root dispersion is now reported correctly, and
clients no longer reject the server due to a large synchronization distance.
* The ntpd daemon dropped incoming NTP packets if their source port was lower
than 123 (the NTP port). Clients behind Network Address Translation (NAT) were
unable to synchronize with the server if their source port was translated to
ports below 123. With this update, the bug was fixed.

Enhancements:

* This update introduces configurable access of memory segments used for Shared
Memory Driver (SHM) reference clocks. Previously, only the first two memory
segments were created with owner-only access, allowing just two SHM reference
clocks to be used securely on a system. Now, the owner-only access to SHM is
configurable with the "mode" option, and it is therefore possible to use more
SHM reference clocks securely.
* Support for nanosecond resolution has been added to the SHM reference clock.
Prior to this update, when a Precision Time Protocol (PTP) hardware clock was
used as a time source to synchronize the system clock (for example, with the
timemaster service from the linuxptp package), the accuracy of the
synchronization was limited due to the microsecond resolution of the SHM
protocol. The nanosecond extension in the SHM protocol now enables
sub-microsecond synchronization of the system clock.