Full Disclosure mailing list archives
Re: reduction of brute force log
From: "Matthijs van Otterdijk" <thotter () gmail com>
Date: Tue, 28 Feb 2006 17:59:41 +0100
Hey, I didn't write it, I just copied a link :P. Maybe the author likes to be pinged? Dunno what those ports are... On 2/28/06, Bob Radvanovsky <rsradvan () unixworks net> wrote:
I am going to test these rules out -- this looks REALLy good! But...I've got just ONE question: why on Earth would you permit ICMP??? And what significances are ports 50, 51, 1599, 1600 and 1601? 443 and 80 are HTTP-S and HTTP (respectively), 123 is NTP -- I realize that, but what are these others ports used for? -r *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -s 10.0.0.0/24 -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -m recent --rcheck --name SSH -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 123 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 1599 -m recent --name SSH --remove -j DROP -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 1600 -m recent --name SSH --set -j DROP -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 1601 -m recent --name SSH --remove -j DROP -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT ----- Original Message ----- From: Matthijs van Otterdijk [mailto:thotter () gmail com] To: full-disclosure () lists grok org uk Subject: Re: [Full-disclosure] reduction of brute force login attempts via SSH through iptables --hashlimitI haven't tried this myself, and I don't know if it is alreadysuggested,but this should stop all the pesky scriptkiddies from filling up yourlogs.Might prove to be a better solution, who knows: http://aplawrence.com/Security/sshloginattack.html Matthijs
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Current thread:
- Re: reduction of brute force log Bob Radvanovsky (Feb 28)
- Re: reduction of brute force log Matthijs van Otterdijk (Feb 28)
- Re: reduction of brute force log Joachim Schipper (Feb 28)
- Re: reduction of brute force log Gary E. Miller (Feb 28)
- <Possible follow-ups>
- Re: reduction of brute force log Matthijs van Otterdijk (Feb 28)
- Re: reduction of brute force log Bob Radvanovsky (Feb 28)