Description of problem: This very critical security issue affects all Fedora and Fedora-EPEL branches! Today, I got this message directly from upstream project: Gentlemen, please read the notification below. Summary: 3.5.3 okay, 3.6.0 broken, 3.6.1 coming wednesday, please keep secret until then. Cheers, Peter --------- The contents of this email message are confidential until the 10th of September 2014. Issue: A specific sequence of packets can crash PowerDNS Recursor 3.6.0 remotely CVE: CVE-2014-3614 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: https://xs.powerdns.com/tmp/minipatch-3.6.1 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 powerdns.support. Finally a reminder - the contents of this message are confidential until the 10th of September! Bert
Version-Release number of selected component (if applicable): Fedora: pdns-recursor-3.6.0-1.fc19 pdns-recursor-3.6.0-1.fc20 pdns-recursor-3.6.0-2.fc21 pdns-recursor-3.6.0-2.fc22 Fedora-EPEL: pdns-recursor-3.6.0-1.el5 pdns-recursor-3.6.0-1.el6 pdns-recursor-3.6.0-1.el7
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 (peter.van.dijk) 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: https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc19 https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc20 https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc21 Package updates for Fedora-EPEL: https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el5 https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el6 https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el7
This is now public: https://www.powerdns.com/news.html#20141010
pdns-recursor-3.6.1-1.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc19
pdns-recursor-3.6.1-1.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc20
pdns-recursor-3.6.1-1.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.fc21
pdns-recursor-3.6.1-1.el5 has been submitted as an update for Fedora EPEL 5. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el5
pdns-recursor-3.6.1-1.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el6
pdns-recursor-3.6.1-1.el7 has been submitted as an update for Fedora EPEL 7. https://admin.fedoraproject.org/updates/pdns-recursor-3.6.1-1.el7
Package pdns-recursor-3.6.1-1.fc21: * 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: https://admin.fedoraproject.org/updates/FEDORA-2014-10600/pdns-recursor-3.6.1-1.fc21 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.