Is CVE-2016-7434 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2016-7434 being exploited in the wild.

How severe is CVE-2016-7434?

High severity, with a CVSS score of 7.5, published 13 January 2017.

Which products and versions are affected?

NTP Project NTP before 4.2.8p9.

Is there a fix for CVE-2016-7434?

A patch was published on 2016-11-21: Fixed in NTP 4.2.8p9 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2016-7434 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2016-7434?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2016-7434: NTP Project NTP denial of service in read_mru_list

CVE-2016-7434 · Severity: high · CVSS 7.5 · Published 2017-01-13

A vulnerability in the Network Time Protocol (NTP) service, which is used to synchronize clocks across computer systems, could allow a remote attacker to crash the service. By sending a specially crafted request, an attacker can cause the NTP daemon to stop responding, potentially disrupting time-sensitive operations and logging across the network. This issue affects various versions of NTP prior to 4.2.8p9.

Quick answers

Is CVE-2016-7434 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2016-7434 being exploited in the wild.
How severe is CVE-2016-7434?: High severity, with a CVSS score of 7.5, published 13 January 2017.
Which products and versions are affected?: NTP Project NTP before 4.2.8p9.
Is there a fix for CVE-2016-7434?: A patch was published on 2016-11-21: Fixed in NTP 4.2.8p9 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-7434 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2016-7434?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A denial of service vulnerability exists in the NTP daemon's read_mru_list function due to improper input validation of incoming packets. A remote, unauthenticated attacker can exploit this by sending a specially crafted 'mrulist' query to the NTP server. This triggers a crash in the ntpd process, leading to a complete loss of availability for the time synchronization service. The vulnerability is addressed in NTP version 4.2.8p9.

Affected products

NTP Project NTP before 4.2.8p9

Timeline

2016-11-21: disclosed: Initial public disclosure via NTP project bug 3082
2016-11-21: patched: Fixed in NTP 4.2.8p9
2017-01-13: advisory: NVD publication date

References

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