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NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p10 was released on 21 March 2017. It addresses 6 medum- and 5 low-severity security issues, 4 informational security topics, 15 bugfixes, and contains other improvements over 4.2.8p9.

Please see the NTP Security Notice for vulnerability and mitigation details.

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NTP Bug 3385

NTP-01-010 NTP: ereallocarray()/eallocarray() underused (Info)

  • Date Resolved: 21 Mar 2017
  • References: Sec 3385
  • Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.
  • Summary: NTP makes use of several wrappers around the standard heap memory allocation functions that are provided by libc. This is mainly done to introduce additional safety checks concentrated on several goals. First, they seek to ensure that memory is not accidentally freed, secondly they verify that a correct amount is always allocated and, thirdly, that allocation failures are correctly handled. There is an additional implementation for scenarios where memory for a specific amount of items of the same size needs to be allocated. The handling can be found in the oreallocarray() function for which a further number-of-elements parameter needs to be provided. Although no considerable threat was identified as tied to a lack of use of this function, it is recommended to correctly apply oreallocarray() as a preferred option across all of the locations where it is possible.
  • Mitigation:
  • Credit: This weakness was discovered by Cure53.
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