Re: heartbleed OpenSSL bug CVE-2014-0160

[Reindl Harald <h.reindl () thelounge net>]

Am 09.04.2014 23:33, schrieb Juergen Christoffel:
> On Wed, Apr 09, 2014 at 09:24:25PM +0200, Reindl Harald wrote:
> > iptables logging needs to be rate-limit always because how it works
> > otherwise you have a problem the first time it really happens seriously
>
> Using limits is sensible, yes. But
>
> > -m limit --limit 1/m
>
> this might be a bit too restrictive to gather data on attempts at
> heartbleeding. And --hashlimit might be more appropriate too as it keeps a
> counter per IP address.

agreed and thanks for the --hashlimit option, after a
large DDOS attack from more than 10000 IP addresses i
got that restrictive :-)

sadly i can't confirm that it works because testing with http://filippo.io/Heartbleed/
don't produce any log-entry and since iptables lives on the deeper layer then httpd
it should cry even on patched machines................

iptables -A INPUT ! -i lo -p tcp -m multiport --destination-port 443,993,995 -m u32 --u32
"52=0x18030000:0x1803FFFF" -m limit --limit 5/h -j LOG --log-level debug --log-prefix "Firewall: Heartbleed"
iptables -A INPUT ! -i lo -p tcp -m multiport --destination-port 443,993,995 -m u32 --u32
"52=0x18030000:0x1803FFFF" -j DROP
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iptables --list --numeric --verbose

    0     0 LOG        tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            multiport dports
443,993,995 u32 "0x34=0x18030000:0x1803ffff" limit: avg 5/hour burst 5 LOG flags 0 level 7 prefix "Firewall:
Heartbleed"
    0     0 DROP       tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            multiport dports
443,993,995 u32 "0x34=0x18030000:0x1803ffff"
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