Date: Mon, 2 Dec 2002 17:55:05 -0600 From: Wayne M Barnes <stabilizer@klentaq.com> To: Charles Swiger <cswiger@mac.com> Cc: freebsd-stable@freebsd.org Subject: Re: psybnc and IRC hack Message-ID: <20021202175505.A1525@klentaq.com> In-Reply-To: <009101c29a34$1b96f4d0$0301a8c0@prime>; from cswiger@mac.com on Mon, Dec 02, 2002 at 01:53:23PM -0500 References: <20021202123616.A33705@klentaq.com> <009101c29a34$1b96f4d0$0301a8c0@prime>
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Dear Charles,
What is "an IRC bouncer"? Is it something I can use to protect
against this hijack of my system?
I am running recent FreeBSD 4.7.
- Wayne
On Mon, Dec 02, 2002 at 01:53:23PM -0500, Charles Swiger wrote:
> [ This probably belongs on freebsd-security, instead... ]
>
> Wayne M Barnes wrote:
> > How can I best recover from, and defend myself from, a hacker
> > who breaks into my system and runs a program called psybnc
> > without my permission? I think he is using my system as a
> > front/slave.
>
> Yes. Unless you installed an IRC bouncer-- or whatever it was being used for--
> yourself, it's a safe bet that your machine was hacked. You haven't identified
> much about the system-- OS version, what service was compromised (if you know,
> and you should investigate that), as well as form an incident timeline.
>
> The best way to recover is to backup the compromised system, for recovery of
> your data and later forensics if you (or your ISP) chooses to investigate
> further.
>
> Reinstall the latest version of FreeBSD from a known-good image, possibly using
> CVSUP to upgrade to -STABLE or the security branch for your version
> (RELENG_4_7?).
>
> Then restore your data (after making sure nothing was compromised...that means
> do not copy date, especially executables without checking them against prior
> backups).
>
> > For now, I have killed psybnc, deleted the directory of stuff
> > that he put in, and changed my password. Is that any good?
>
> It's a good starting point, yes, but it certainly isn't sufficient.
>
> > Can there be a real vaccination built in to FreeBSD?
>
> Yes. It's easy to compare your system against the software from the OS install
> disk; where many people encounter problems is with the changes they've made
> afterwards themselves. How complete are your backups?
>
> -Chuck
>
>
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--
Wayne M Barnes stabilizer@klentaq.com
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