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NTP Bug 3114

Broadcast Mode Replay Prevention DoS

  • Date Resolved: 21 Nov 2016
  • References: Sec 3114 / CVE-2016-7427 / VU#633847
  • Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p9, and ntp-4.3.90 up to, but not including ntp-4.3.94.
  • CVSS2: LOW 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
  • CVSS3: MED 4.3 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • Summary: The broadcast mode of NTP is expected to only be used in a trusted network. If the broadcast network is accessible to an attacker, a potentially exploitable denial of service vulnerability in ntpd's broadcast mode replay prevention functionality can be abused. An attacker with access to the NTP broadcast domain can periodically inject specially crafted broadcast mode NTP packets into the broadcast domain which, while being logged by ntpd, can cause ntpd to reject broadcast mode packets from legitimate NTP broadcast servers.
  • Mitigation:
  • Credit: This weakness was discovered by Matthew Van Gundy of Cisco.


This topic: Main > SecurityNotice > NtpBug3114
Topic revision: r1 - 2016-11-21 - 14:06:48 - HarlanStenn
 
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