Linux distributions that are potentially susceptible to GHOST and that should be patched are: It is recommended to reboot and update all of your Linux servers.
Let’s see how to check if your system is vulnerable and steps to protect it.
This bug was fixed in the package glibc - 2.23-0ubuntu7 --------------- glibc (2.23-0ubuntu7) xenial-security; urgency=medium * REGRESSION UPDATE: Previous update introduced ABI breakage in internal glibc query ABI - Revert patches/This bug was fixed in the package eglibc - 2.19-0ubuntu6.11 --------------- eglibc (2.19-0ubuntu6.11) trusty-security; urgency=medium * REGRESSION UPDATE: Previous update introduced ABI breakage in internal glibc query ABI - Back out patches/This bug was fixed in the package eglibc - 2.15-0ubuntu10.17 --------------- eglibc (2.15-0ubuntu10.17) precise-security; urgency=medium * REGRESSION UPDATE: Previous update introduce ABI breakage in internal glibc query ABI - Back out patches/amd64 (2.23-0ubuntu6, 2.23-0ubuntu7) End-Date: 2017-03-22 Immediately after that, the system is no longer able to resolve names. To add to that, I just manually updated another running webserver, and boom.
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Recently, a security fault revealed causing many devices to be at risk – especially Linux servers.
It is a bug known as glibc bug which can cause harm to many devices, applications and softwares which are internet connected.
If someone could test that the udeb's from there don't break your pxe install that would be great.
Quite likely what will happen is if the libc6-udeb is manually installed after it breaks and the install is continued on successfully, another failure will happen when the libnss-dns-udeb is pulled from the ubuntu archive, and will likely need to also be manually installed.
I note that -ubuntu6.10 was recently added to the archive. After updating a server (without reboot), the internal DNS servers received odd queries of type TYPE20736 (no idea what that is) 21-Mar-2017 .627 queries: info: client 172.16.x.x#49803 (host.internal.domain IN TYPE20736 (172.16.x.x) After rebooting said server, it starts querying normal type A records again.
I unfortunately don't know how to get logs off the system to send in :(I confirm same kind of problem in Precise. 21-Mar-2017 .578 queries: client x.x.x.x#43836 ( query: TYPE20736 - (x.x.x.x) I realize this is not directly related to the subject of this bug, but I think its relevant. I'm unable to install any 14.04 from my PXE server.
Anyway, for glibc, the answer is pretty much every process.
What would be useful would be to know which processes are left over with the old copy, and this command won't tell you.
I don't know if anything else also needs restarting (so i did a reboot after to be sure).
If it helps, I also have traditional instead of resolvconf Yes, it's known that updating from the version with the regression to the version that backed it out will cause the same (well, inverse) bug to appear until services or the machine are restarted.
Update all packages to the latest version for supported versions of Ubuntu or Debian which is available by Reboot is essential since many applications use GNU C Library that must be restarted to have access to new library.