[arch-general] Bind 9.6.1-1 patched against dynamic update ddos?

RedShift redshift at pandora.be
Wed Jul 29 12:37:02 EDT 2009

Fredrik Eriksson wrote:
> Hi,
> I've seen that there's a dynamic update ddos attack that is widely 
> available on the net and after looking for the solution it seems that 
> bind's latest patch (9.6.1-P1) solves this problem.
> So my question is more like this, is extra/bind 9.6.1-1 in the 
> repository the same as bind 9.6.1-P1?
> The build date of the current package in extra/ says the 18 July but the 
> homepage of BIND says the latest patch was published the 28 July.
> Best regards
> Fredrik Eriksson

According to a commenter on the slashdot news article about this issue, this should provide a temporary countermeasure:

iptables -A INPUT -p udp --dport 53 -j DROP -m u32 --u32 '30>>27&0xF=5'

haven't tested it myself though...


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