Blocked those and the attack still persists.
> From: [email protected] > To: [email protected] > Date: Mon, 2 Sep 2013 07:14:43 -0400 > Subject: Re: [hlds_linux] NET_GetLong attacks > > Okay, the number you provided (53) is the size of the string, the entire > packet size is either 60 or 67 depending on the query. (there's 2 queries > that are repeating.) > > Try these rules: > iptables -A INPUT -p udp --dport 27135 -m length --length 60 -j DROP > iptables -A INPUT -p udp --dport 27135 -m length --length 67 -j DROP > > I just tried these locally and they do not stop the valid queries from the > steam browser. > > > ----- Original Message ----- > From: "Michael Johansen" <[email protected]> > To: "Half-Life dedicated Linux server mailing list" > <[email protected]> > Sent: Monday, September 02, 2013 6:57 AM > Subject: Re: [hlds_linux] NET_GetLong attacks > > > > http://replays.blackoutgaming.org/attack1.cap > > > > This is from an attack. You should be able to open it using WireShark. > >> From: [email protected] > >> To: [email protected] > >> Date: Mon, 2 Sep 2013 06:44:46 -0400 > >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> > >> Post the tcpdump so we can look at it. > >> > >> ----- Original Message ----- > >> From: "Michael Johansen" <[email protected]> > >> To: "Half-Life dedicated Linux server mailing list" > >> <[email protected]> > >> Sent: Monday, September 02, 2013 6:38 AM > >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> > >> > >> >I tried that too, and the servers stopped showing in both server browser > >> >and SourceBans. It looks like the only way to stop this is with a plugin > >> >or > >> >extension on the servers. > >> >> From: [email protected] > >> >> To: [email protected] > >> >> Date: Mon, 2 Sep 2013 06:35:04 -0400 > >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> > >> >> Modify the packet size in the rule I gave you to match what tcpdump is > >> >> showing then, see if that works. > >> >> > >> >> > >> >> ----- Original Message ----- > >> >> From: "Michael Johansen" <[email protected]> > >> >> To: "Half-Life dedicated Linux server mailing list" > >> >> <[email protected]> > >> >> Sent: Monday, September 02, 2013 6:32 AM > >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> > >> >> > >> >> >I don't know how SRCDS find that range, but tcpdump claims the packet > >> >> >is > >> >> >53 > >> >> >bytes. And I'll have to take back what I said that the server lag was > >> >> >gone - it still lags badly whenever the attack hits. The cache takes > >> >> >quite > >> >> >a bit of it, but it still lags. > >> >> > > >> >> >> From: [email protected] > >> >> >> To: [email protected] > >> >> >> Date: Mon, 2 Sep 2013 06:07:49 -0400 > >> >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> >> > >> >> >> Rating limiting the a2s queries will still make the server appear > >> >> >> offline, > >> >> >> if you read your log that you posted, it gives you the size, and > >> >> >> the > >> >> >> acceptable size, you should be able to tailor a rule to fit your > >> >> >> needs. > >> >> >> > >> >> >> Log: > >> >> >> NET_GetLong: Split packet from 157.208.132.148:54712 with invalid > >> >> >> split > >> >> >> size (number 99/ count 114) where size 8293 is out of valid range > >> >> >> [564 - > >> >> >> 1248 ] > >> >> >> NET_GetLong: Split packet from 61.52.31.78:45086 with invalid > >> >> >> split > >> >> >> size > >> >> >> (number 99/ count 114) where size 8293 is out of valid range [564 - > >> >> >> 1248 ] > >> >> >> > >> >> >> Size: 8293 > >> >> >> Valid Size: 564-1248 > >> >> >> > >> >> >> Rule: > >> >> >> iptables -A INPUT -i eth0 -p udp --dport 27015 -m length --length > >> >> >> 8293 -j > >> >> >> DROP > >> >> >> > >> >> >> Make sure you also update the destination port if it's different. > >> >> >> (I > >> >> >> just > >> >> >> tried this rule on my machine and it's working.) > >> >> >> > >> >> >> > >> >> >> ----- Original Message ----- > >> >> >> From: "Michael Johansen" <[email protected]> > >> >> >> To: "Half-Life dedicated Linux server mailing list" > >> >> >> <[email protected]> > >> >> >> Sent: Monday, September 02, 2013 5:12 AM > >> >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> >> > >> >> >> > >> >> >> > I've tried that, and it doesn't work. For now the solution is to > >> >> >> > run > >> >> >> > Query > >> >> >> > Cache to make the server playable, it will still disappear from > >> >> >> > the > >> >> >> > serverbrowser though. Is there a solution to that? Somehow > >> >> >> > rate-limiting > >> >> >> > A2S queries? > >> >> >> > > >> >> >> >> From: [email protected] > >> >> >> >> To: [email protected] > >> >> >> >> Date: Mon, 2 Sep 2013 04:10:15 -0400 > >> >> >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> >> >> > >> >> >> >> Yes, it was mentioned on the other thread titled "steam server > >> >> >> >> ports." > >> >> >> >> > >> >> >> >> http://forums.alliedmods.net/showthread.php?t=151551 > >> >> >> >> > >> >> >> >> The 4th section from the top is dealing with attacks like this. > >> >> >> >> > >> >> >> >> ----- Original Message ----- > >> >> >> >> From: "Michael Johansen" <[email protected]> > >> >> >> >> To: "Half-Life dedicated Linux server mailing list" > >> >> >> >> <[email protected]> > >> >> >> >> Sent: Monday, September 02, 2013 2:38 AM > >> >> >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> >> >> > >> >> >> >> > >> >> >> >> > Is it possible to stop this attack using iptables? Usually > >> >> >> >> > using > >> >> >> >> > the > >> >> >> >> > "Valve-way" of stopping the attacks won't work very well. > >> >> >> >> >> Date: Sun, 1 Sep 2013 23:45:23 -0400 > >> >> >> >> >> From: [email protected] > >> >> >> >> >> To: [email protected] > >> >> >> >> >> Subject: Re: [hlds_linux] NET_GetLong attacks > >> >> >> >> >> > >> >> >> >> >> That might have worked with the other filtering we are doing. > >> >> >> >> >> If > >> >> >> >> >> it > >> >> >> >> >> does > >> >> >> >> >> I will send you the money. Send me a private email with your > >> >> >> >> >> steam > >> >> >> >> >> user. > >> >> >> >> >> > >> >> >> >> >> > >> >> >> >> >> On 9/1/2013 11:11 PM, Bottiger wrote: > >> >> >> >> >> > If you used the version I posted it should not have set > >> >> >> >> >> > your > >> >> >> >> >> > sv_max_queries_sec_global > >> >> >> >> >> > so high. > >> >> >> >> >> > > >> >> >> >> >> > You are supposed to lower that number until it becomes > >> >> >> >> >> > playable > >> >> >> >> >> > and > >> >> >> >> >> > raise > >> >> >> >> >> > the window. > >> >> >> >> >> > > >> >> >> >> >> > > >> >> >> >> > > >> >> >> >> > _______________________________________________ > >> >> >> >> > To unsubscribe, edit your list preferences, or view the list > >> >> >> >> > archives, > >> >> >> >> > please visit: > >> >> >> >> > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> >> >> >> > >> >> >> >> > >> >> >> >> _______________________________________________ > >> >> >> >> To unsubscribe, edit your list preferences, or view the list > >> >> >> >> archives, > >> >> >> >> please visit: > >> >> >> >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> >> >> > > >> >> >> > _______________________________________________ > >> >> >> > To unsubscribe, edit your list preferences, or view the list > >> >> >> > archives, > >> >> >> > please visit: > >> >> >> > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> >> >> > >> >> >> > >> >> >> _______________________________________________ > >> >> >> To unsubscribe, edit your list preferences, or view the list > >> >> >> archives, > >> >> >> please visit: > >> >> >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> >> > > >> >> > _______________________________________________ > >> >> > To unsubscribe, edit your list preferences, or view the list > >> >> > archives, > >> >> > please visit: > >> >> > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> >> > > >> >> > >> >> > >> >> _______________________________________________ > >> >> To unsubscribe, edit your list preferences, or view the list archives, > >> >> please visit: > >> >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> > > >> > _______________________________________________ > >> > To unsubscribe, edit your list preferences, or view the list archives, > >> > please visit: > >> > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > >> > >> > >> _______________________________________________ > >> To unsubscribe, edit your list preferences, or view the list archives, > >> please visit: > >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > > > > _______________________________________________ > > To unsubscribe, edit your list preferences, or view the list archives, > > please visit: > > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, please > visit: > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux
