LinuxQuestions.org
Latest LQ Deal: Latest LQ Deals
Home Forums Tutorials Articles Register
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Security
Reload this Page source port 80 hits my iptables and fills my log dir
User Name
Password
Linux - Security This forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.

Notices


Reply
  Search this Thread
Old 09-15-2006, 05:45 AM   #1
gabsik
Member
 
Registered: Dec 2005
Location: This planet
Distribution: Debian,Xubuntu
Posts: 567

Rep: Reputation: 30
source port 80 hits my iptables and fills my log dir

Code:
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13348 DF PROTO=TCP SPT=80 DPT=12971 SEQ=2765356488 ACK=1949227637 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13347 DF PROTO=TCP SPT=80 DPT=12982 SEQ=117068163 ACK=1002994963 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13346 DF PROTO=TCP SPT=80 DPT=12970 SEQ=3425689590 ACK=925052953 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13345 DF PROTO=TCP SPT=80 DPT=12985 SEQ=1614575110 ACK=1593592475 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13343 DF PROTO=TCP SPT=80 DPT=12972 SEQ=2515422567 ACK=1242495854 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13342 DF PROTO=TCP SPT=80 DPT=12990 SEQ=1783217778 ACK=768027605 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13341 DF PROTO=TCP SPT=80 DPT=12984 SEQ=2330446581 ACK=60706365 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13340 DF PROTO=TCP SPT=80 DPT=12986 SEQ=2466621319 ACK=92341939 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13339 DF PROTO=TCP SPT=80 DPT=12974 SEQ=214979759 ACK=246135416 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13338 DF PROTO=TCP SPT=80 DPT=12980 SEQ=3094063307 ACK=1733429009 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13369 DF PROTO=TCP SPT=80 DPT=12992 SEQ=202180988 ACK=458846818 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13371 DF PROTO=TCP SPT=80 DPT=12993 SEQ=2372780055 ACK=1673513368 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13372 DF PROTO=TCP SPT=80 DPT=12991 SEQ=1322503841 ACK=824885277 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13429 DF PROTO=TCP SPT=80 DPT=13084 SEQ=4069911222 ACK=1349544616 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13433 DF PROTO=TCP SPT=80 DPT=16144 SEQ=1658902793 ACK=1197889954 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13452 DF PROTO=TCP SPT=80 DPT=17663 SEQ=19722934 ACK=345639476 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13461 DF PROTO=TCP SPT=80 DPT=13356 SEQ=2583304338 ACK=303940658 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13462 DF PROTO=TCP SPT=80 DPT=13097 SEQ=1919126686 ACK=2020777536 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:56 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13463 DF PROTO=TCP SPT=80 DPT=13092 SEQ=263521307 ACK=2024921705 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:57 argo NO_PASSARAN:  IN=eth0 OUT= MAC=00:40:f4:7a:58:25:00:09:5b:b0:3c:a2:08:00  SRC=64.179.93.196 DST=192.168.0.2 LEN=44 TOS=00 PREC=0x00 TTL=107 ID=13543 DF PROTO=TCP SPT=80 DPT=16363 SEQ=1769710793 ACK=514301826 WINDOW=16560 ACK SYN URGP=0
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
It really looks to me like a DOS.I have much more than this in my logs same source ip, same source port, privileged one 80 (???).
I have a tor server running on this host.It does happen people connect to me by a privileged port like 80,443 and in my iptables script i accept connections starting from http ports 80,443 going to my or e dir tor ports 9090,9091 and accepting only them two dropping the rest !
Code:
$IPT -A INPUT -i eth0 -p tcp -d 192.168.0.2/32 --sport 80 --dport 9090:9091 -j ACCEPT
$IPT -A INPUT -i eth0 -p tcp -d 192.168.0.2/32 --sport 443 --dport 9090:9091 -j ACCEPT
$ipt -A INPUT -i eth0 -j ULOG --ulog-prefix "NO_PASSARAN: "
$ipt -A INPUT -i eth0 -j DROP
What makes me worry is this:
Code:
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
Last edited by gabsik; 09-15-2006 at 05:53 AM.
 
Old 09-15-2006, 06:08 AM   #2
win32sux
LQ Guru
 
Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
Posts: 9,870

Rep: Reputation: 380Reputation: 380Reputation: 380Reputation: 380
Quote:
Originally Posted by gabsik
Code:
Sep 15 09:43:58 argo kernel: ip_conntrack: table full, dropping packet.
check the output of:
Code:
cat /proc/sys/net/ipv4/ip_conntrack_max
maybe try increasing the value...

just my ...
Last edited by win32sux; 09-15-2006 at 11:17 AM.
 
  


Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What happens when root dir fills up? leiavoia Debian 5 11-14-2004 07:14 PM
iptables LOG on a Switch Mirror Port Master_D Linux - Networking 0 09-06-2004 04:33 AM
Why So Many Hits on port 25 Tonight ?!? opioid General 1 08-14-2004 02:18 AM
Apache Log broke using iptables and port forwarding rwyarbrough Linux - Networking 1 01-14-2004 08:32 AM
How would i log the source MAC address w/ iptables? phek Linux - Security 12 12-14-2001 12:18 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Security

All times are GMT -5. The time now is 09:42 AM.

Contact Us - Advertising Info - Rules - Privacy - LQ Merchandise - Donations - Contributing Member - LQ Sitemap -
Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration