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Things changing overnight



Sometime in the past few days, my modem /dev/ttyS4 changed its permissions from 660 to 640 without my intervention. My first question: is there any kind of security package on debian that might have done this as a cronjob? I don't use devfs.

When asking on #debian, a user suggested that I check my logs to see if I had been hacked. I found in /var/logs/auth.log that the command `su` had been run to switch from user `root` to user `nobody` at 3:35 this morning, a time when I was not connected to the internet (I use ppp to connect through my modem). My second question: any idea what might have done this? (obviously, I'd like to avoid a reinstall)

(I can't seem to find any cronjob that would be doing this, but it would help if you had any suggestions)

please cc: me as I am not subscribed to this high-volume mailing list

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