mailing list archives
Re: Apache hacks (./atac, d0s.txt)
From: "Jay D. Dyson" <jdyson () treachery net>
Date: Fri, 29 Apr 2005 14:49:42 -0700 (PDT)
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On Fri, 29 Apr 2005, Andrew Y Ng wrote:
My server has been seeing some usual activities today, I don't have much
time to get down to the bottom of things, but after I investigated
briefly I have decided to disable PERL executable permission for
www-data (Apache process's user), also locked /var/tmp so www-data
cannot write to it.
Looks like it ignores all the `kill` signals, not sure how I can
actually kill it...
Seems a bit premature to call this an "Apache hack." First off,
it's probably not Apache's fault. Judging from what I've seen thus far,
it looks more like a flaw in one of your CGI scripts which allowed someone
to create and execute an arbitrary file in one of the system's most
obvious world-writable directories.
From what I've seen, the script looks like a vanilla, PERL-based
IRC bot. You should be able to kill -9 it via root.
Either way, your system got molested. Take the box offline, back
up your data, audit your CGI scripts and access policies for flaws and
weaknesses, scrub the system, reinstall the OS from trusted media, apply
all the latest patches, bring the box back online, and have a nice day.
( ( _______
)) )) .-"There's always time for a good cup of coffee"-. >====<--.
C|~~|C|~~| \----- Jay D. Dyson -- jdyson () treachery net -----/ | = |-'
`--' `--' `-- Pardon me, but am I on the right planet? --' `------'
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