POTENTIONAL FIX: etded.x86 getstatus exploit Options

[Guest_Dutchman_*]

Hi,

since a few months there is a exploit floating around abusing the getstatus requests to launch dos attacks against random targets and as a side effect creating massive lags on clients and the server.
Cause of this Yada from Staatsschutz.org made a patch for linux wich reduces the effectivity of this exploit.

etfix_getstatus 0.2 by yada / staatsschutz.org / jan. 2011
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This patch will ratelimit etded.x86 2.60b getstatus requests to 1 per IP every
4 seconds. This approach is not ideal as the real fix would be to change the
protocol to require some kind of handshake but this would break compatibility
with existing clients so its not really practical. The worst part is that the
patch is (in theory) vulnerable to a dos where legitimate clients could be
denied access to the getstatus command but i feel this is less of a headache
than kiddies using the server to flood random targets and thereby lagging the
server and pushing bandwith usage through the roof (master server is excluded
from ratelimit so no need to worry about it being denied using spoofed
packets).

Download the file right here.

A readme.txt, the sourcecode and a small howto are included.

Your free to distribute this file.

This post has been edited by Dutchman: Jan 6 2011, 11:33 AM

[AmericanPie1979]

cpu is on 21 - 22 %

network is now ok

rx: 130.66 kB/s 2191 p/s tx: 14.47 kB/s 74 p/s


^^ Danke :)

Ich weiß nicht ob du ihn noch kennst aber Opa hat nach dir gefragt ^^



PS : old network usage ^^

rx: 102.67 kB/s 1729 p/s tx: 698.75 kB/s 551 p/s

lG

This post has been edited by AmericanPie1979: Oct 19 2011, 06:32 PM

[Guest_Dutchman_*]

cpu is on 21 - 22 %

network is now ok

rx: 130.66 kB/s 2191 p/s tx: 14.47 kB/s 74 p/s


^^ Danke :)

Ich weiß nicht ob du ihn noch kennst aber Opa hat nach dir gefragt ^^



PS : old network usage ^^

rx: 102.67 kB/s 1729 p/s tx: 698.75 kB/s 551 p/s

lG

OPA hehe...yes and his fellow "MOERDER" ....offcourse i know them, they were a while on our server.....4 years ago? ...crazy people :-D
We can PM about this but please say hello to him :)

Well, glad it worked for ya dude :-)
and ps. with the linux command 'top' you can check wich process uses most of the cpu.