On Fri, 2005-09-09 at 10:57, Jose Luis Hime wrote: > Only I have the root password, that I change every time the shadow file is > deleted. The passwd file is ok, also. > > The shadow has the following permissions: > -r-------- 1 root root 8233 Sep 9 10:01 shadow > > No crontab, at or other scheduled jobs. > > No suspect process in "ps". > > So... the last resort is really to re-install my box. > > Can I use the "update" method to fix any problems without destroying my > installation? It took me 3 days to complete it! > > Thanks in any way! Are you running anything like phpbb or postnuke or similar type packages? These have had many exploits in the past. You would need to make sure you have these fully patched or don't run them. If you think the system has actually been compromised you don't really have any choice but to do a bare metal install. Have you tried disconnecting the system from the network to see if the shadow file continues to disappear? That might isolate the problem to something running on the system vs. someone doing it from outside the system. But if you think the system is compromised your only choice it so reinstall.
