full-disclosure - Re: ntpd segfaults accessing IPv6 hosts

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Message-ID: <41865692.8.614e.6585@gis.net>
From: mayer at gis.net (mayer@....net)
Subject: Re: ntpd segfaults accessing IPv6 hosts

----- Original Message Follows -----
> Hi full-disclosure!
> 
> ntpd 1:4.2.0a-11 (as in debian testing/sarge and unstable/sid) 
> segfaults when accessing ntp servers on IPv6 hosts. I don't know 
> whether this bug is exploitable. But such a server on 
> pool.ntp.org might DoS many servers.

There are no IPv6 addresses in pool.ntp.org so there is no risk here.
(dig AAAA pool.ntp.org)

> 
> There is a fixed version available.
> 

The latest ntp-dev tarball should have the fixes. Currently the
number of ntp servers with IPv6 AAAA records is very low.

> For more details see http://bugzilla.ntp.org/show_bug.cgi?id=353
> 
> Bernhard
> 

Danny 
NTP Development