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Fixed

LIN5-22150 : Security Advisory - ntp - CVE-2016-7429

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 receives a server response on a socket that corresponds to a different interface than was used for the request, the peer structure is updated to use the interface for new requests. If ntpd is running on a host with multiple interfaces in separate networks and the operating system doesn't check source address in received packets (e.g. rp_filter on Linux is set to 0), an attacker that knows the address of the source can send a packet with spoofed source address which will cause ntpd to select wrong interface for the source and prevent it from sending new requests until the list of interfaces is refreshed, which happens on routing changes or every 5 minutes by default. If the attack is repeated often enough (once per second), ntpd will not be able to synchronize with the source. 

http://support.ntp.org/bin/view/Main/NtpBug3072
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7429

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