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Fixed

LIN5-22151 : Security Advisory - ntp - CVE-2016-7426

Created: Nov 22, 2016    Updated: May 29, 2018
Resolved Date: Nov 24, 2016
Found In Version: 5.0.1.37
Fix Version: 5.0.1.38
Severity: Standard
Applicable for: Wind River Linux 5
Component/s: Userspace

Description

When ntpd is configured with rate limiting for all associations (restrict default limited in ntp.conf), the limits are applied also to responses received from its configured sources. An attacker who knows the sources (e.g., from an IPv4 refid in server response) and knows the system is (mis)configured in this way can periodically send packets with spoofed source address to keep the rate limiting activated and prevent ntpd from accepting valid responses from its sources.

http://support.ntp.org/bin/view/Main/NtpBug3071
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7426

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