Security update for ntp (important)

This update for ntp to 4.2.8p7 fixes the following issues:

• CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.
• CVE-2016-1548, bsc#977461: Interleave-pivot
• CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association
  attack.
• CVE-2016-1550, bsc#977464: Improve NTP security against buffer
  comparison timing attacks.
• CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability
• CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will
  cause an assertion botch in ntpd.
• CVE-2016-2517, bsc#977455: remote configuration trustedkey/
  requestkey/controlkey values are not properly validated.
• CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array
  wraparound with MATCH_ASSOC.
• CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked.
• This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705,
  CVE-2015-7974

Bugs fixed:

• Restrict the parser in the startup script to the first
  occurrance of "keys" and "controlkey" in ntp.conf (bsc#957226).

This update was imported from the SUSE:SLE-12-SP1:Update update project.