Description of problem:
This very critical security issue affects all Fedora and Fedora-EPEL branches!
Today, I got this message directly from upstream project:
please read the notification below. Summary: 3.5.3 okay, 3.6.0 broken, 3.6.1 coming wednesday, please keep secret until then.
The contents of this email message are confidential until the 10th of
Issue: A specific sequence of packets can crash PowerDNS Recursor
Affected: All deployments of PowerDNS Recursor 3.6.0
Not Affected: PowerDNS Authoritative Server, PowerDNS Recursor versions
other than 3.6.0
Workaround: Only users from netmasks specified in 'allow-from' can
cause the crash.
Remediation: Upgrade to the packages we provided, or apply our minimal
patch and recompile
Recently, we've discovered that PowerDNS Recursor 3.6.0 (but NOT earlier)
can crash when exposed to a specific sequence of malformed packets. This
sequence happened spontaneously with one of our largest deployments, and
the packets did not appear to have a malicious origin.
Yet, this crash can be triggered remotely, leading to a denial of service
attack. There appears to be no way to use this crash for system compromise
or stack overflow.
Fixed packages and sources are already available on:
* Tar https://autotest.powerdns.com/job/recursor-git/1400/artifact/pdns/pdns-recursor-git-unknown-20140902-1400-2203669.tar.bz2
* 64 bit RPM/DEB https://autotest.powerdns.com/job/recursor-git-semistatic-pkgs-amd64/1034/
* 32 bit RPM/DEB https://autotest.powerdns.com/job/recursor-git-semistatic-pkgs-i386/1034/
In addition, if you want to apply a minimal fix, it can be found on:
We will release 3.6.1 on the 10th of Sepember 2014. In addition, two weeks
after that, we will give a fuller explanation on the causes of the crash.
If you need any help in upgrading your PowerDNS Recursor, or if you are a
PowerDNS distributor and have questions, please contact us on
Finally a reminder - the contents of this message are confidential until the
10th of September!
Version-Release number of selected component (if applicable):
Thanks for filing this. I presume you will be submitting builds for the above after this has been made public? Do you know if upstream has or requires a CVE for this? We can provide one if they do not have one already. If they do, can you please note it in the bug?
(In reply to Vincent Danen from comment #2)
> Thanks for filing this. I presume you will be submitting builds for the
> above after this has been made public? Do you know if upstream has or
> requires a CVE for this? We can provide one if they do not have one
> already. If they do, can you please note it in the bug?
I've added Peter (firstname.lastname@example.org) to the cc list. He's upstream developer.
As already mentioned in my first comment, upstream has already requested a CVE number (CVE-2014-3614).
And yes, my plan is to build 3.6.1 packages for all Fedora and Fedora-EPEL branches until this has been made public.
https://autotest.powerdns.com/job/recursor-git/1412/artifact/pdns/pdns-recursor-3.6.1.tar.bz2 is ready. Announcement will happen tomorrow.
pdns-recursor 3.6.1 has been released. Should we make this bug public, now?
Package updates for Fedora:
Package updates for Fedora-EPEL:
This is now public:
pdns-recursor-3.6.1-1.fc19 has been submitted as an update for Fedora 19.
pdns-recursor-3.6.1-1.fc20 has been submitted as an update for Fedora 20.
pdns-recursor-3.6.1-1.fc21 has been submitted as an update for Fedora 21.
pdns-recursor-3.6.1-1.el5 has been submitted as an update for Fedora EPEL 5.
pdns-recursor-3.6.1-1.el6 has been submitted as an update for Fedora EPEL 6.
pdns-recursor-3.6.1-1.el7 has been submitted as an update for Fedora EPEL 7.
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing pdns-recursor-3.6.1-1.fc21'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
pdns-recursor-3.6.1-1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.6.1-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.6.1-1.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.6.1-1.el5 has been pushed to the Fedora EPEL 5 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.6.1-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.6.1-1.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.