Public bug reported:
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System
-> About Ubuntu
lsb_release -rd
Description: Ubuntu 18.04.4 LTS
Release: 18.04
2) The version of the package you are using, via 'apt-cache policy
pkgname' or by checking in
apt-cache policy libpam-google-authenticator
libpam-google-authenticator:
Installed: 20170702-1
Candidate: 20170702-1
Version table:
*** 20170702-1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
100 /var/lib/dpkg/status
3) What you expected to happen
Didn't expect a Kernel reboot, just an error message
4) What happened instead
server crashed
https://errors.ubuntu.com/user/58ef3f64f201a5f60a086141e3751b91a710dbf811d9f5824ebe26eab6c42e229a24677e6c0b1ea5361c25158042dbfa77fd3a3c0bedd28377dfe9f43d91eca8
There is a bug that will cause a ubuntu to crash from bad configuration of
libpam-google-authenticator on
4.15.0-109-generic #110-Ubuntu SMP Tue Jun 23 02:39:32 UTC 2020 x86_64 x86_64
x86_64 GNU/Linux.
kernel: BUG: unable to handle kernel NULL pointer dereference at
0000000000000010
-- Reboot --
Steps to reproduce :
• sudo apt-get update
• sudo apt-get install libpam-google-authenticator
• vi /etc/pam.d/sshd
add below line without nullok
auth required pam_google_authenticator.so
Then restart ssh,
• sudo systemctl restart sshd.service
without initializing / running google-authenticator for ssh user.
• ssh -l user yourUbuntuServer.com
Work around is to add nullok to end of pam.d/sshd line
** Affects: google-authenticator (Ubuntu)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1886284
Title:
libpam-google-authenticator, kernel: BUG: unable to handle kernel NULL
pointer dereference at 0000000000000010
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/google-authenticator/+bug/1886284/+subscriptions
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