I believe this fixes your issues untill Valve decides to issue a fix (if 
at all).. 
http://www.sourceop.com/modules.php?name=Downloads&d_op=viewdownload&cid=9

-ics

J.Miribel kirjoitti:
> Hello,
>
> It seems there is a new exploit allowing people to spam a HL2 server is 
> out.. In fact it spams the serveur with empty UDP queries..
> It does not crash the server but if you look at the server with HLSW the 
> ping skyrockets to 1000 (instead of.. 10). Impossible to connect to the 
> server neither.
>
> We just added his IP in our ACL to fix my issue, but not everyone has L3 
> switches out there..
>
> Any one faced that problem before ? Is there a workaround other than 
> filtering the attacker's IP ?
>
> Oh and yeah I left the guy's IP public.. ;)
>
> Here are my tcpdump:
> 18:45:56.661173 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.662657 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.663906 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.665371 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.666848 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.668084 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.669294 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.670544 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.672015 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.673282 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.674463 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.675939 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.677175 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.678408 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.679886 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.681135 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.682617 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.683843 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.685315 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.686565 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.687801 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.689245 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.690471 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.691715 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.693198 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.694425 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.695662 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.696898 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.698630 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.699870 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.701090 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.702568 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.703805 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.705042 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.706513 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.707756 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.708980 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.710258 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.711696 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.712892 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.714203 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.715881 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.717085 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.718396 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.719806 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.721030 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.722343 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
> 18:45:56.723501 IP ANancy-157-1-14-14.w86-204.abo.wanadoo.fr.1473 > 
> XXX.XXX.XXX.XXX.27015: UDP, length 0
>
>
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