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>1.4. Security</A
></H1
><P
> As of the 11th of November 2006, no actual security problems with PowerDNS 2.9.18, Recursor 3.1.4, or later are known about. This page
will be updated with all bugs which are deemed to be security problems, or could conceivably lead to those. Any such notifications
will also be sent to all PowerDNS mailinglists.
</P
><P
> Version 3.1.3 and earlier of the PowerDNS recursor contain two security issues, both of which can lead to a denial of service, both of which can be triggered
by remote users. One of the issues might lead be exploited and lead to a system compromise. For more detail, see <A
HREF="powerdns-advisory-2006-01.html"
>Section 1.5</A
> and
<A
HREF="powerdns-advisory-2006-02.html"
>Section 1.6</A
>.
</P
><P
> Version 3.0 of the PowerDNS recursor contains a denial of service bug which can be exploited remotely. This bug, which we believe to only lead to a crash,
has been fixed in 3.0.1. There are no guarantees however, so an upgrade from 3.0 is highly recommended.
</P
><P
> All versions of PowerDNS before 2.9.18 contain the following two bugs, which only apply to installations running with the LDAP backend, or installations providing recursion
to a limited range of IP addresses. If any of these apply to you, an upgrade is highly advised:
<P
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><UL
><LI
><P
> The LDAP backend did not properly escape all queries, allowing it to fail and not answer questions. We have not investigated further risks involved,
but we advise LDAP users to update as quickly as possible (Norbert Sendetzky, Jan de Groot)
</P
></LI
><LI
><P
> Questions from clients denied recursion could blank out answers to clients who are allowed recursion services, temporarily. Reported by Wilco Baan.
This would've made it possible for outsiders to blank out a domain temporarily to your users. Luckily PowerDNS would send out SERVFAIL or Refused, and
not a denial of a domain's existence.
</P
></LI
></UL
>
</P
><P
> All versions of PowerDNS before 2.9.17 are known to suffer from remote denial of service problems which can disrupt operation. Please upgrade
to 2.9.17 as this page will only contain detailed security information from 2.9.17 onwards.
</P
><P
> If you have a security problem to report, please email us at both <CODE
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><<A
HREF="mailto:powerdns@powerdns.com"
>powerdns@powerdns.com</A
>></CODE
> and at
<CODE
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><<A
HREF="mailto:ahu@ds9a.nl"
>ahu@ds9a.nl</A
>></CODE
>. We adhere to the <A
HREF="http://www.wiretrip.net/rfp/policy.html"
TARGET="_top"
>Rain Forest Puppy
Full Disclosure Policy (RFPolicy) v2.0</A
> and we ask you to do the same.
</P
><P
> We remind PowerDNS users that under the terms of the GNU General Public License, PowerDNS comes with ABSOLUTELY NO WARRANTY.
This license is included in the distribution and in this documentation, see <A
HREF="license.html"
>Appendix E</A
>.
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