3

I am testing rkhunter on a Ubuntu server 16.04 in Virtualbox. I received an email alert by rkhunter on the 11th of October, inviting me to "Please inspect this machine, because it may be infected".

So I made a scan with rkhunter and found the following result:

$ sudo rkhunter -c --rwo
Warning: The file properties have changed:
         File: /usr/bin/curl
         Current hash: f025f2f2dca226c921b2b09da78b220656c098652d41c8654dc4853ff3fd1e5a
         Stored hash : cf846b7f3f11fc8af6cf79a2bbad3c8314eec72c1425b49bc9e34cf85a5090bb
         Current inode: 661569    Stored inode: 661888
         Current file modification time: 1507203916 (05-Oct-2017 13:45:16)
         Stored file modification time : 1478126766 (02-Nov-2016 23:46:06)

So I decided to check the curl package:

$ dpkg -S curl
$ echo $?
0

As you can see nothing was reported. I read a discussion at serverfault where it was suggested to check if the hash change was due to an automatic security update. Checking /var/log/apt/history.log I noticed that there was an unattended-upgrade of curl starting in 2017-10-11. I wonder: why rkhunter reports 05 October as the file modification date while the upgrade was made the 11 October?

3
sudo rkhunter --update --propupd

should be run after any apt upgrades automatically or manualy

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.