some attack to fedora machine .

[Antti J. Huhtala]

to, 2008-04-10 kello 21:50 -0400, max kirjoitti:
> Edwin Tan wrote:
> > hi Subhodip,
> > Please check below link for antivirus program download for linux.
> > 
> > http://www.avast.com/eng/download-avast-for-linux-edition.html
> > 
> > thanks.
> > 
> 
> Running virus scans is a waste of time. If you believe its compromised 
> wipe the drive and flash the bios. I don't mean just format and install 
> either. Write zeros (maybe more than once) to the harddrive. Make sure 
> the MBR does not survive. Do not backup anything! if you have something 
> that you absolutely cannot do with out, I don't mean MP3's either, then 
> back that up to a cd and label it clearly and scan only that, more than 
> once with multiple antivirus scanners, rootkit scanners, use windows and 
> Linux antivirus scanners and rootkit hunters. if these are something for 
> which you have a checksum then makesure that it matches the original no 
> matter what or shred it. Yes i mean physically shred or otherwise 
> destroy the cd. If the the files fail a single test, consider them 
> tainted and destroy them. Flash the bios because there are viruses that 
> will compromise the BIOS, these will be cross platform, they will affect 
> any machine with any OS. Make sure that any external drives that have 
> ever come into contact with the infected machine get the same treatment. 
> Wipe it completely clean!
> 
> Max
> 
A spot of overkill, perhaps?

In my modest experience my Linux box has been compromised thŕee (3)
times that I know of. The first was an RH 6.2 box, and my present box
has been invaded twice, first during the FC6 era and then soon after my
F8 installation last December.
Each and every time the invader came in through ssh. Against my better
judgement in installing F8 I allowed ssh to remain a "secure service" as
suggested by the F8 installer. Well, it proved not to be.

There seem to be some "sportsmen" out there who just can't resist the
temptation of an open ssh port. Now, if I plan to use ssh to connect to
my box from a remote location, I'm going to have iptables rules to allow
ssh only from known addresses. Not very flexible, perhaps, but I don't
want to allow these sportsmen in again.

In each case, just wiping the installation clean and reinstalling with
ssh port closed seems to have done the trick.

My 2 c.

Antti