* Blocking SMTP Worm [not found] <19fb1ac90610240653x69cc1951g9766d7c809ddecef@mail.gmail.com> @ 2006-10-24 13:54 ` Juan Carlos Peláez Mendoza 2006-10-24 14:04 ` Gáspár Lajos 2006-10-31 19:54 ` R. DuFresne 0 siblings, 2 replies; 6+ messages in thread From: Juan Carlos Peláez Mendoza @ 2006-10-24 13:54 UTC (permalink / raw) To: netfilter Hi list, My IP Address have been listed in the RBL's too many times, I installed into my linux box MailScanner + Spamassassin + Clamavmodule + FProt, I set up the iptables rules allowing only smtp, pop and ssh traffic, but when I see the traffic with tcpdump I see this strange behavior: 17:14:42.255867 IP 192.168.0.92.2802 > Static-IP-cr2001181.cable.net.co.smtp: S 396792405:396792405(0) win 16384 <mss 1460,nop,nop,sackOK> 17:14:43.457612 IP 192.168.0.92.2803 > Static-IP-cr2001181.cable.net.co.smtp : S 760094736:760094736(0) win 16384 <mss 1460,nop,nop,sackOK> 17:14:46.512975 IP 192.168.0.92.2804 > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win 16384 <mss 1460,nop,nop,sackOK> 17:14:49.466442 IP 192.168.0.92.2804 > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win 16384 <mss 1460,nop,nop,sackOK> 17:14:50.118528 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp : S 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> 17:14:53.071734 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp: S 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> I see the traffic today and still getting that result after blocking the traffic for the 192.168.0.92 address: 08:40:10.664379 IP 192.168.0.92.2728 > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win 16384 <mss 1460,nop,nop,sackOK> 08:40:16.683771 IP 192.168.0.92.2728 > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win 16384 <mss 1460,nop,nop,sackOK> 08:40:20.731636 IP 192.168.0.92.2731 > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win 16384 <mss 1460,nop,nop,sackOK> 08:40:23.706369 IP 192.168.0.92.2731 > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win 16384 <mss 1460,nop,nop,sackOK> What can I do to stop and block this worm??? Here are my basic rules for IPtables. echo 1 > /proc/sys/net/ipv4/ip_forward iptables --flush modprobe ip_conntrack modprobe ip_conntrack_ftp modprobe ip_nat_ftp modprobe ip_conntrack_irc iptables --table nat --flush iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP #Blocking 192.168.0.92 SMTP Traffic iptables -A FORWARD -p tcp --dport 25 -s 192.168.0.92 -j DROP iptables -A FORWARD -i eth1 -j ACCEPT echo "Enrutamiento Activado..." # Bloqueando ip 218.55.23.50 iptables -A INPUT -s 218.55.23.50 -j DROP # Bloqueando ip 201.160.33.60 iptables -A INPUT -s 201.160.33.60 -j DROP iptables -A INPUT -s 192.168.0.92 -j DROP iptables -A FORWARD -p tcp --dport 25 -j DROP #Permitir trafico de entrada a puertos SMTP, POP, SSH iptables -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d PRIVATE_IP -j ACCEPT iptables -t filter -A INPUT -p tcp -s 0/0 -d PUBLIC_IP --dport 25 -j ACCEPT iptables -t filter -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d 0/0 -j DROP iptables -A INPUT -p tcp -s 0/0 -d 192.168.0.0/24 --sport 25 -i eth0 -j DROP iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 110 -j ACCEPT iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 22 -j ACCEPT iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 3306 -j REJECT # Botar paquetes que vayan de la Lan por el puerto 25 iptables -A FORWARD -p tcp --dport 25 -j DROP Can anybody help me with this??? Thanks, Juan Carlos Peláez Mendoza ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Blocking SMTP Worm 2006-10-24 13:54 ` Blocking SMTP Worm Juan Carlos Peláez Mendoza @ 2006-10-24 14:04 ` Gáspár Lajos 2006-10-24 14:19 ` Juan Carlos Peláez Mendoza 2006-10-31 19:54 ` R. DuFresne 1 sibling, 1 reply; 6+ messages in thread From: Gáspár Lajos @ 2006-10-24 14:04 UTC (permalink / raw) To: Juan Carlos Peláez Mendoza; +Cc: netfilter Juan Carlos Peláez Mendoza írta: > Hi list, > > My IP Address have been listed in the RBL's too many times, I > installed into my linux box MailScanner + Spamassassin + Clamavmodule > + FProt, I set up the iptables rules allowing only smtp, pop and ssh > traffic, but when I see the traffic with tcpdump I see this strange > behavior: > > 17:14:42.255867 IP 192.168.0.92.2802 > > Static-IP-cr2001181.cable.net.co.smtp: S 396792405:396792405(0) win > 16384 <mss 1460,nop,nop,sackOK> > 17:14:43.457612 IP 192.168.0.92.2803 > > Static-IP-cr2001181.cable.net.co.smtp : S 760094736:760094736(0) win > 16384 <mss 1460,nop,nop,sackOK> > 17:14:46.512975 IP 192.168.0.92.2804 > > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win > 16384 <mss 1460,nop,nop,sackOK> > 17:14:49.466442 IP 192.168.0.92.2804 > > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win > 16384 <mss 1460,nop,nop,sackOK> > 17:14:50.118528 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp : S > 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> > 17:14:53.071734 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp: S > 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> > > I see the traffic today and still getting that result after blocking > the traffic for the 192.168.0.92 address: > > 08:40:10.664379 IP 192.168.0.92.2728 > > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win > 16384 <mss 1460,nop,nop,sackOK> > 08:40:16.683771 IP 192.168.0.92.2728 > > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win > 16384 <mss 1460,nop,nop,sackOK> > 08:40:20.731636 IP 192.168.0.92.2731 > > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win > 16384 <mss 1460,nop,nop,sackOK> > 08:40:23.706369 IP 192.168.0.92.2731 > > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win > 16384 <mss 1460,nop,nop,sackOK> > > > What can I do to stop and block this worm??? > > Here are my basic rules for IPtables. > > > echo 1 > /proc/sys/net/ipv4/ip_forward > iptables --flush > modprobe ip_conntrack > modprobe ip_conntrack_ftp > modprobe ip_nat_ftp > modprobe ip_conntrack_irc > > iptables --table nat --flush > > iptables --table nat --append POSTROUTING --out-interface eth0 -j > MASQUERADE > iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP > > #Blocking 192.168.0.92 SMTP Traffic > iptables -A FORWARD -p tcp --dport 25 -s 192.168.0.92 -j DROP > > iptables -A FORWARD -i eth1 -j ACCEPT > > echo "Enrutamiento Activado..." > > # Bloqueando ip 218.55.23.50 > iptables -A INPUT -s 218.55.23.50 -j DROP > > # Bloqueando ip 201.160.33.60 > iptables -A INPUT -s 201.160.33.60 -j DROP > > iptables -A INPUT -s 192.168.0.92 -j DROP > iptables -A FORWARD -p tcp --dport 25 -j DROP > > #Permitir trafico de entrada a puertos SMTP, POP, SSH > iptables -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d PRIVATE_IP -j > ACCEPT > iptables -t filter -A INPUT -p tcp -s 0/0 -d PUBLIC_IP --dport 25 -j > ACCEPT > iptables -t filter -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d > 0/0 -j DROP > iptables -A INPUT -p tcp -s 0/0 -d 192.168.0.0/24 --sport 25 -i eth0 > -j DROP > > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 110 -j ACCEPT > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 22 -j ACCEPT > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 3306 -j REJECT > > > # Botar paquetes que vayan de la Lan por el puerto 25 > iptables -A FORWARD -p tcp --dport 25 -j DROP > > > > Can anybody help me with this??? > Have you tried this command??? iptables -vnL > > Thanks, > > > > Juan Carlos Peláez Mendoza > > > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Blocking SMTP Worm 2006-10-24 14:04 ` Gáspár Lajos @ 2006-10-24 14:19 ` Juan Carlos Peláez Mendoza [not found] ` <9e12c5a529145622a46a6cbe5fc05e4b@former03.de> 0 siblings, 1 reply; 6+ messages in thread From: Juan Carlos Peláez Mendoza @ 2006-10-24 14:19 UTC (permalink / raw) To: Gáspár Lajos; +Cc: netfilter I got this Chain FORWARD (policy ACCEPT 59M packets, 20G bytes) pkts bytes target prot opt in out source destination 18236 876K DROP tcp -- * * 192.168.0.92 0.0.0.0/0 tcp dpt:25 3317K 2826M ACCEPT all -- eth1 * 0.0.0.0/0 0.0.0.0/0 Chain INPUT (policy ACCEPT 6671K packets, 733M bytes) pkts bytes target prot opt in out source destination 3084 207K DROP all -- * * 192.168.0.92 0.0.0.0/0 Does this mean that my rule is working?? because the traffic still passing through the both NIC's. Thanks, Juan Carlos Pelaez Mendoza On 10/24/06, Gáspár Lajos <swifty@freemail.hu> wrote: > Juan Carlos Peláez Mendoza írta: > > Hi list, > > > > My IP Address have been listed in the RBL's too many times, I > > installed into my linux box MailScanner + Spamassassin + Clamavmodule > > + FProt, I set up the iptables rules allowing only smtp, pop and ssh > > traffic, but when I see the traffic with tcpdump I see this strange > > behavior: > > > > 17:14:42.255867 IP 192.168.0.92.2802 > > > Static-IP-cr2001181.cable.net.co.smtp: S 396792405:396792405(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 17:14:43.457612 IP 192.168.0.92.2803 > > > Static-IP-cr2001181.cable.net.co.smtp : S 760094736:760094736(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 17:14:46.512975 IP 192.168.0.92.2804 > > > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 17:14:49.466442 IP 192.168.0.92.2804 > > > Static-IP-cr2001181.cable.net.co.smtp: S 804817506:804817506(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 17:14:50.118528 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp : S > > 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> > > 17:14:53.071734 IP 192.168.0.92.2805 > mailgw2.diveo.net.co.smtp: S > > 2079962326:2079962326(0) win 16384 <mss 1460,nop,nop,sackOK> > > > > I see the traffic today and still getting that result after blocking > > the traffic for the 192.168.0.92 address: > > > > 08:40:10.664379 IP 192.168.0.92.2728 > > > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 08:40:16.683771 IP 192.168.0.92.2728 > > > emt200-31-197-53.emtelco.com.smtp: S 3599806789:3599806789(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 08:40:20.731636 IP 192.168.0.92.2731 > > > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > 08:40:23.706369 IP 192.168.0.92.2731 > > > bbvaganadero.telefonica.net.co.smtp: S 4026584844:4026584844(0) win > > 16384 <mss 1460,nop,nop,sackOK> > > > > > > What can I do to stop and block this worm??? > > > > Here are my basic rules for IPtables. > > > > > > echo 1 > /proc/sys/net/ipv4/ip_forward > > iptables --flush > > modprobe ip_conntrack > > modprobe ip_conntrack_ftp > > modprobe ip_nat_ftp > > modprobe ip_conntrack_irc > > > > iptables --table nat --flush > > > > iptables --table nat --append POSTROUTING --out-interface eth0 -j > > MASQUERADE > > iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP > > > > #Blocking 192.168.0.92 SMTP Traffic > > iptables -A FORWARD -p tcp --dport 25 -s 192.168.0.92 -j DROP > > > > iptables -A FORWARD -i eth1 -j ACCEPT > > > > echo "Enrutamiento Activado..." > > > > # Bloqueando ip 218.55.23.50 > > iptables -A INPUT -s 218.55.23.50 -j DROP > > > > # Bloqueando ip 201.160.33.60 > > iptables -A INPUT -s 201.160.33.60 -j DROP > > > > iptables -A INPUT -s 192.168.0.92 -j DROP > > iptables -A FORWARD -p tcp --dport 25 -j DROP > > > > #Permitir trafico de entrada a puertos SMTP, POP, SSH > > iptables -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d PRIVATE_IP -j > > ACCEPT > > iptables -t filter -A INPUT -p tcp -s 0/0 -d PUBLIC_IP --dport 25 -j > > ACCEPT > > iptables -t filter -A INPUT -p tcp --dport 25 -s 192.168.0.0/24 -d > > 0/0 -j DROP > > iptables -A INPUT -p tcp -s 0/0 -d 192.168.0.0/24 --sport 25 -i eth0 > > -j DROP > > > > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 110 -j ACCEPT > > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 22 -j ACCEPT > > iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 3306 -j REJECT > > > > > > # Botar paquetes que vayan de la Lan por el puerto 25 > > iptables -A FORWARD -p tcp --dport 25 -j DROP > > > > > > > > Can anybody help me with this??? > > > Have you tried this command??? > > iptables -vnL > > > > Thanks, > > > > > > > > Juan Carlos Peláez Mendoza > > > > > > > > > -- ________________________________________________ "Hope has died in me." ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <9e12c5a529145622a46a6cbe5fc05e4b@former03.de>]
* Re: Blocking SMTP Worm [not found] ` <9e12c5a529145622a46a6cbe5fc05e4b@former03.de> @ 2006-10-24 19:53 ` Juan Carlos Peláez Mendoza 2006-10-26 9:27 ` Gáspár Lajos 0 siblings, 1 reply; 6+ messages in thread From: Juan Carlos Peláez Mendoza @ 2006-10-24 19:53 UTC (permalink / raw) To: former03 | Baltasar Cevc; +Cc: netfilter Baltasar, I think what you say is right, the traffic that the tcpdump shows is before applying the filters and rules, The IP that I mentioned it's now blocked, but another IP's are beggining to send traffic through the interface, how can I do to stop the traffic to my LAN but not to my linux box, because this is my Mail Server and is the only one that I want to send traffic at this port??? 14:51:55.442934 IP 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp > 192.168.0.163.4115: P 168:192(24) ack 168 win 17353 14:51:55.443055 IP 192.168.0.163.4115 > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: . ack 192 win 65344 14:51:55.659325 IP 192.168.0.163.4115 > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: P 168:190(22) ack 192 win 65344 14:51:56.554482 IP 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp > 192.168.0.163.4115: P 192:210(18) ack 190 win 17331 14:51:56.665159 IP 192.168.0.163.4115 > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: . ack 210 win 65326 Thanks, Juan Carlos Peláez Mendoza On 10/24/06, former03 | Baltasar Cevc <baltasar.cevc@former03.de> wrote: > Hi Juan, > > On 24.10.2006, at 16:19, Juan Carlos Peláez Mendoza wrote: > > Chain FORWARD (policy ACCEPT 59M packets, 20G bytes) > > pkts bytes target prot opt in out source > > destination > > 18236 876K DROP tcp -- * * 192.168.0.92 > > 0.0.0.0/0 tcp dpt:25 > > 3317K 2826M ACCEPT all -- eth1 * 0.0.0.0/0 > > 0.0.0.0/0 > > > > Chain INPUT (policy ACCEPT 6671K packets, 733M bytes) > > pkts bytes target prot opt in out source > > destination > > 3084 207K DROP all -- * * 192.168.0.92 > > 0.0.0.0/0 > > > > Does this mean that my rule is working?? because the traffic still > > passing through the both NIC's. > Well, it does mean that these rules are acive and x pakets/bytes (the > two first figures on ach) lines have mached, thus have been > dropped/accepted. I think tcpdump shows the traffic before filtering is > done, but I'm not sure. > > Baltasar > > Baltasar Cevc > > _____ former 03 gmbh > _____ infanteriestraße 19 haus 6 eg > _____ D-80797 muenchen > > _____ http://www.former03.de > > -- ________________________________________________ "Hope has died in me." ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Blocking SMTP Worm 2006-10-24 19:53 ` Juan Carlos Peláez Mendoza @ 2006-10-26 9:27 ` Gáspár Lajos 0 siblings, 0 replies; 6+ messages in thread From: Gáspár Lajos @ 2006-10-26 9:27 UTC (permalink / raw) To: Juan Carlos Peláez Mendoza; +Cc: netfilter Juan Carlos Peláez Mendoza írta: > Baltasar, > > I think what you say is right, the traffic that the tcpdump shows is > before applying the filters and rules, The IP that I mentioned it's > now blocked, but another IP's are beggining to send traffic through > the interface, > > how can I do to stop the traffic to my LAN but not to my linux box, > because this is my Mail Server and is the only one that I want to send > traffic at this port??? > iptables -A FORWARD -j DROP -p tcp --dport 25 This will drop every smtp traffic that goes through your box! Remember: This is the FORWARD chain! It is not the nicest solution... :) Take a look on my script ! :) https://lists.netfilter.org/pipermail/netfilter/2006-August/066404.html Swifty > 14:51:55.442934 IP 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp > > 192.168.0.163.4115: P 168:192(24) ack 168 win 17353 > 14:51:55.443055 IP 192.168.0.163.4115 > > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: . ack 192 win 65344 > 14:51:55.659325 IP 192.168.0.163.4115 > > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: P 168:190(22) ack > 192 win 65344 > 14:51:56.554482 IP 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp > > 192.168.0.163.4115: P 192:210(18) ack 190 win 17331 > 14:51:56.665159 IP 192.168.0.163.4115 > > 61-64-104-223-adsl-tai.STATIC.so-net.net.tw.smtp: . ack 210 win 65326 > > > Thanks, > > > Juan Carlos Peláez Mendoza > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Blocking SMTP Worm 2006-10-24 13:54 ` Blocking SMTP Worm Juan Carlos Peláez Mendoza 2006-10-24 14:04 ` Gáspár Lajos @ 2006-10-31 19:54 ` R. DuFresne 1 sibling, 0 replies; 6+ messages in thread From: R. DuFresne @ 2006-10-31 19:54 UTC (permalink / raw) To: Juan Carlos Peláez Mendoza; +Cc: netfilter [-- Attachment #1: Type: TEXT/PLAIN, Size: 1241 bytes --] -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 24 Oct 2006, Juan Carlos Peláez Mendoza wrote: > Hi list, > > My IP Address have been listed in the RBL's too many times, I > installed into my linux box MailScanner + Spamassassin + Clamavmodule > + FProt, I set up the iptables rules allowing only smtp, pop and ssh > traffic, but when I see the traffic with tcpdump I see this strange > behavior: > [SNIP] > > What can I do to stop and block this worm??? > Wipe out the OS on 192.168.0.92, reinstall from scratch and apply all patches and updates prior to exposing to the internet. that should clear up the sapm worm. Thanks, Ron DuFresne - -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ admin & senior security consultant: sysinfo.com http://sysinfo.com Key fingerprint = 9401 4B13 B918 164C 647A E838 B2DF AFCC 94B0 6629 ...We waste time looking for the perfect lover instead of creating the perfect love. -Tom Robbins <Still Life With Woodpecker> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFFR6nnst+vzJSwZikRAnNPAJ9F4HQkzAQjkKSaNVr6+uNg4FE44ACfSsDf CrGJLJ9MZPZbV1wJu76Faos= =4IZ+ -----END PGP SIGNATURE----- ^ permalink raw reply [flat|nested] 6+ messages in thread
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2006-10-24 13:54 ` Blocking SMTP Worm Juan Carlos Peláez Mendoza
2006-10-24 14:04 ` Gáspár Lajos
2006-10-24 14:19 ` Juan Carlos Peláez Mendoza
[not found] ` <9e12c5a529145622a46a6cbe5fc05e4b@former03.de>
2006-10-24 19:53 ` Juan Carlos Peláez Mendoza
2006-10-26 9:27 ` Gáspár Lajos
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