NTP security hole CVE-2013-5211?

[Poul-Henning Kamp]

In message <5323C244.8050101 at freebsd.org>, Julian Elischer writes:

>the best solution is to add a firewall stateful rule so that the ONLY 
>port 123 udp packet that gets in is one that is a response to one you 
>sent out first.

And to deny any packet which is too short:

	deny udp from any to any dst-port 123 iplen 0-75

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.