full-disclosure - Checkpoint VPN DoS woes

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Date: Tue Sep 20 19:50:39 2005
From: sil at infiltrated.net (J. Oquendo)
Subject: Checkpoint VPN DoS woes

While tinkering with my VPN connections, servers, firewalls and routers, I
brang down the network to its knees with an attack from one machine to
itself using a spoofed private address. The program I was using was
something I wrote and it shredded my Checkpoint and its VPN's to oblivion
both internally and externally. This is what syslog-ng reported before the
connection was toasted...

Sep 20 13:06:09 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:13 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:19 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:20 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:26 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:32 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:38 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:08:50 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:10:56 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6
Sep 20 13:13:02 xxx.xxx.xxx.2 00:08:da:70:21:61 <50002>  packet (An
internal error has occurred.) Src:10.10.10.10 Dst:10.1.11.240 IPP:6

I had to connect to my firewall from an outside source because my
internal connection (10.1.11.0/24 range) was unable to both send or
receive any kind of packets. Seems like the program choked the firewall.
After a reboot of both the router and the Linux server I set up to do my
pentest, the router was still choked until I shut down the Linux machine.
All of this with 149 packets...

[root@...es log]# uname -a
Linux hades 2.6.9-11.ELsmp #1 SMP Wed Jun 8 17:54:20 CDT 2005 i686 i686 i386 GNU/Linux

Network would not come back up without this machine being offline. Linux
machine was choked to shreds as well. Won't post code for now but I would
like someone over at Checkpoint to have a browse at it to assess what went
on. Addresses and names are obviously removed. Again... Someone at
Checkpoint or better. People looking for stupid DoS tools will not receive
a response, this message is not meant for you - or j0o however you want to
be addressed.

# ssh xxxxx@....xxx.xxx.xxx
xxxxx@....xxx.xxx.xxx's password:
Welcome to Safe@...ice 425W, unlimited nodes 5.0.90x 00:08:da:xx:xx:xx

>show vpn sites
 1:
  disabled false
  name NYCFW
  gateway xxx.xxx.xxx.2
  gateway2 undefined
  loginmode automatic
  configmode automatic
  authmethod certificate
  type sitetosite
  keepalive disabled
  bypassnat enabled
  bypassfw enabled
  user xxxxxxx
  password ""
  topopass xxxxxxxxxxx
  net1 undefined
  netmask1 undefined
  net2 undefined
  netmask2 undefined
  net3 undefined
  netmask3 undefined
  usepfs false
  phase1ikealgs automatic
  phase1exptime 0
  phase2ikealgs automatic
  phase2exptime 0
  phase1dhgroup automatic
  phase2dhgroup automatic
  dnsname xxx.xxx.xxx.2

 2:
  disabled false
  name MAFW
  gateway xxx.xxx.xxx.100
  gateway2 undefined
  loginmode automatic
  configmode automatic
  authmethod certificate
  type sitetosite
  keepalive disabled
  bypassnat enabled
  bypassfw enabled
  user xxxxxxx
  password ""
  topopass xxxxxxxxxxx
  net1 undefined
  netmask1 undefined
  net2 undefined
  netmask2 undefined
  net3 undefined
  netmask3 undefined
  usepfs false
  phase1ikealgs automatic
  phase1exptime 0
  phase2ikealgs automatic
  phase2exptime 0
  phase1dhgroup automatic
  phase2dhgroup automatic
  dnsname xxx.xxx.xxx.100

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
J. Oquendo
GPG Key ID 0x97B43D89
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x97B43D89

"Just one more time for the sake of sanity tell me why
 explain the gravity that drove you to this..." Assemblage