[CentOS] Deleting contents of /tmp on shutdown

James Hogarth james.hogarth at gmail.com
Sun Dec 13 13:45:18 UTC 2009


Owned by apache in tmp?

Sounds like an insecure web app or injection attack.

2009/12/13 Thomas Dukes <tdukes at sc.rr.com>

>
>
> > -----Original Message-----
> > From: centos-bounces at centos.org
> > [mailto:centos-bounces at centos.org] On Behalf Of Geerd-Dietger Hoffmann
> > Sent: Saturday, December 12, 2009 10:18 PM
> > To: CentOS mailing list
> > Subject: Re: [CentOS] Deleting contents of /tmp on shutdown
> >
> > On Sun, Dec 13, 2009 at 3:10 AM, Thomas Dukes
> > <tdukes at sc.rr.com> wrote:
> > >> > Today, I found upd.pl in my tmp directory.  The date was
> > oct 09.  I
> > >> > also found my /etc/passwd and /etc/shadow had been changed
> > >> with a user
> > >> > of 0Profile added.  I deleted the old files and restored
> > those from
> > >> > backup.  I ran my chkrootkit and installed mod_security.
> > >> SSH is not
> > >> > running so I don't know how this happened.
> > >>
> > >> Perhaps your system is not as simple as you think it is.  ;-/
> > >>
> > >> --keith
> > >
> > >
> > > Thanks, Keith!
> > >
> > > Guess I'd better brush up on my vi commands in case I have to boot
> > > from a rescue disk. :-)
> >
> > All you need is [Esc]q! :)
> >
> > >
> > > Just guessing here, but to do this, I need to add:
> > >
> > > tmpfs /tmp tmpfs size=100M,mode=0755 0 0 To my /etc/fstb
> > and cross my
> > > fingers?
> >
> > I would make it a little bigger as 100M depending on how much
> > memory you have. And the mode should be the same as /tmp
> > would normally be =>
> > mode=777 :)
>
> I have 1GB of RAM.  What would be a good size?
>
> >
> > If you have been hacked, like it seams you have, you should
> > first find out how the guy got in. Do you have a webserver
> > running? Firewall enabled? Then just to be safe I would
> > always reinstall as you never know what he might have done.
>
> The udp.pl file was owned by apache.  Not sure that would matter.  I have
> no
> cluse as to how it got there.  The date on the file was oct 09 and those
> logs have already been rotated out.
>
> >
> > Then you can modify the tmp in fstab
> >
> > Cheers Didi
>
> Running a full backup now.  When complete, I will make the changes to
> fstab.
>
> Thanks!!
>
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