Description of problem: (Embargoed until July 19 after 15:00 CET) It is possible to crash (SIGSEGV) a NSD child server process by sending it a non-standard DNS packet from any host on the internet. A crashed child process will automatically be restarted by the parent process, but an attacker may keep the NSD server occupied restarting child processes by sending it a stream of such packets effectively preventing the NSD server to serve. All NSD 3 versions are vulnerable to this attack. (NSD 3.0.0-3.0.8, 3.1.0-3.1.1, and 3.2.0-3.2.11). So is the NSD 4 development branch. == Remote Exploit. The problem packet causes NSD to dereference a null pointer. Most operating systems map the null pointer's address such that accessing it causes a segmentation fault, ruling out the possibility for remote exploit. Version-Release number of selected component (if applicable): all version up to and including nsd-3.2.11 I'll prepare the 3.2.12 release
Thanks for this, Paul. I'm going to hijack this bug to turn it into an SRT bug so we can properly track it.
Fix for VU#624931 CVE-2012-2978: NSD denial of service vulnerability from non-standard DNS packet from any host on the internet. http://www.nlnetlabs.nl/downloads/CVE-2012-2978.txt
Package nsd-3.2.12-1: * was pushed to the testing repositories, * should be available at your local mirror within two days. Update it with (EPEL): # su -c 'yum update --enablerepo=epel-testing nsd-3.2.12-1' Update it with (Fedora): # su -c 'yum update --enablerepo=updates-testing nsd-3.2.12-1' Or use the direct links below to download the package if it is not yet available via the mirror sites. Please leave karma/feedback. nsd-3.2.12-1.el5 has been submitted as an update for EL5. https://admin.fedoraproject.org/updates/nsd-3.2.12-1.el5 nsd-3.2.12-1.el6 has been submitted as an update for EL6. https://admin.fedoraproject.org/updates/nsd-3.2.12-1.el6
nsd-3.2.12-1.fc16 has been submitted as an update for Fedora. https://admin.fedoraproject.org/updates/nsd-3.2.12-1.fc16 nsd-3.2.12-1.fc17 has been submitted as an update for Fedora. https://admin.fedoraproject.org/updates/nsd-3.2.12-1.fc17
Vincent: can we close this bug?