[squid-users] Squid Proxy Vulnerability.

From: Josh Fritts <reikoshea@dont-contact.us>
Date: Thu, 29 Nov 2007 13:21:42 -0600

Hello,

We got a notification from our ISP that our squid server was being
used to relay emails.

We checked the logs and found 2.5 Million hits just like this snippit:

----------------------------------------------------------------------------

1196170398.384 837 64.237.46.55 TCP_MISS/200 222 CONNECT
146.217.15.240:25 - DIRECT/146.217.15.240 -
1196170398.656 8175 64.237.46.132 TCP_MISS/200 665 CONNECT
216.157.254.253:25 - DIRECT/216.157.254.253 -
1196170399.049 1132 64.237.46.55 TCP_MISS/200 165 CONNECT
209.44.115.50:25 - DIRECT/209.44.115.50 -
1196170399.201 4603 64.237.46.55 TCP_MISS/200 139 CONNECT
62.148.180.192:25 - DIRECT/62.148.180.192 -
1196170399.458 14482 64.237.46.132 TCP_MISS/200 224 CONNECT
65.75.75.57:25 - DIRECT/65.75.75.57 -
1196170400.072 10406 64.237.46.132 TCP_MISS/200 279 CONNECT
127.0.0.1:25 - DIRECT/127.0.0.1 -
1196170400.460 2044 208.167.225.68 TCP_MISS/200 444 CONNECT
192.75.254.1:25 - DIRECT/192.75.254.1 -
1196170400.486 9305 64.237.46.132 TCP_MISS/200 1343 CONNECT
211.41.82.89:25 - DIRECT/211.41.82.89 -
1196170400.662 6576 208.167.225.68 TCP_MISS/200 257 CONNECT
64.18.4.10:25 - DIRECT/64.18.4.10 -
1196170401.406 17183 64.237.46.132 TCP_MISS/200 2130 CONNECT
195.50.106.135:25 - DIRECT/195.50.106.135 -
1196170401.503 645 208.167.225.68 TCP_MISS/200 180 CONNECT
216.32.180.22:25 - DIRECT/216.32.180.22 -
1196170401.682 939 208.167.225.68 TCP_MISS/200 306 CONNECT
216.9.208.251:25 - DIRECT/216.9.208.251 -
1196170401.747 10433 64.237.46.132 TCP_MISS/200 279 CONNECT
127.0.0.1:25 - DIRECT/127.0.0.1 -
1196170401.775 10413 64.237.46.132 TCP_MISS/200 279 CONNECT
127.0.0.1:25 - DIRECT/127.0.0.1 -
1196170402.079 120 208.167.225.68 TCP_MISS/200 15 CONNECT
17.148.20.66:25 - DIRECT/17.148.20.66 -
1196170402.267 5056 208.167.225.68 TCP_MISS/200 245 CONNECT
202.54.61.113:25 - DIRECT/202.54.61.113 -
1196170403.291 31145 64.237.46.132 TCP_MISS/200 121 CONNECT
62.40.36.103:25 - DIRECT/62.40.36.103 -
1196170403.578 5218 208.167.225.68 TCP_MISS/200 273 CONNECT
66.235.248.64:25 - DIRECT/66.235.248.64 -
1196170403.707 810 208.167.225.68 TCP_MISS/200 452 CONNECT
207.69.189.219:25 - DIRECT/207.69.189.219 -
1196170404.115 1850 64.237.46.55 TCP_MISS/200 121 CONNECT
202.78.116.253:25 - DIRECT/202.78.116.253 -
1196170404.166 1502 208.167.225.68 TCP_MISS/200 250 CONNECT
193.134.210.132:25 - DIRECT/193.134.210.132 -
1196170404.208 4983 208.167.225.68 TCP_MISS/200 2060 CONNECT
209.191.118.103:25 - DIRECT/209.191.118.103 -
1196170404.249 30567 208.167.225.68 TCP_MISS/200 0 CONNECT
64.29.222.22:25 - DIRECT/64.29.222.22 -
1196170404.887 7863 64.237.46.55 TCP_MISS/200 2223 CONNECT
209.191.88.247:25 - DIRECT/209.191.88.247 -
1196170404.916 627 208.167.225.68 TCP_MISS/200 150 CONNECT
208.97.132.73:25 - DIRECT/208.97.132.73 -
1196170405.288 14668 64.237.46.132 TCP_MISS/200 3520 CONNECT
211.115.216.226:25 - DIRECT/211.115.216.226 -
1196170405.324 1670 64.237.46.52 TCP_MISS/200 249 CONNECT
146.131.119.26:25 - DIRECT/146.131.119.26 -
1196170405.659 882 64.237.46.55 TCP_MISS/200 159 CONNECT
199.224.89.185:25 - DIRECT/199.224.89.185 -
1196170405.917 1555 64.237.46.55 TCP_MISS/200 201 CONNECT
204.10.18.136:25 - DIRECT/204.10.18.136 -
1196170406.776 30671 64.237.46.55 TCP_MISS/200 0 CONNECT
193.252.22.142:25 - DIRECT/193.252.22.142 -
1196170407.099 6405 208.167.225.68 TCP_MISS/200 339 CONNECT
216.219.253.216:25 - DIRECT/216.219.253.216 -
1196170407.214 30834 64.237.46.132 TCP_MISS/200 164 CONNECT
12.206.33.39:25 - DIRECT/12.206.33.39 -
1196170407.446 30690 64.237.46.132 TCP_MISS/200 0 CONNECT
80.95.172.3:25 - DIRECT/80.95.172.3 -
1196170407.875 4719 64.237.46.55 TCP_MISS/200 1898 CONNECT
204.15.82.30:25 - DIRECT/204.15.82.30 -
1196170407.948 5745 64.237.46.55 TCP_MISS/200 404 CONNECT
216.122.128.125:25 - DIRECT/216.122.128.125 -
1196170407.969 217 208.167.225.68 TCP_MISS/200 0 CONNECT
213.246.154.213:25 - DIRECT/213.246.154.213 -
1196170408.043 17180 64.237.46.132 TCP_MISS/200 945 CONNECT
207.88.96.47:25 - DIRECT/207.88.96.47 -
1196170408.739 17415 64.237.46.132 TCP_MISS/200 2266 CONNECT
192.43.228.202:25 - DIRECT/192.43.228.202 -
1196170408.816 19751 208.167.225.68 TCP_MISS/200 2188 CONNECT
66.196.97.250:25 - DIRECT/66.196.97.250 -
1196170408.896 2385 64.237.46.55 TCP_MISS/200 253 CONNECT
67.152.80.132:25 - DIRECT/67.152.80.132 -
1196170409.017 693 64.237.46.55 TCP_MISS/200 108 CONNECT
132.77.4.177:25 - DIRECT/132.77.4.177 -
1196170409.112 779 64.237.46.55 TCP_MISS/200 436 CONNECT
99.161.100.123:25 - DIRECT/99.161.100.123 -
1196170409.400 10512 64.237.46.132 TCP_MISS/200 145 CONNECT
203.181.255.19:25 - DIRECT/203.181.255.19 -
1196170409.434 25 64.237.46.55 TCP_MISS/503 0 CONNECT
63.73.11.8:25 - DIRECT/63.73.11.8 -
1196170409.560 2179 208.167.225.68 TCP_MISS/200 135 CONNECT
213.154.128.18:25 - DIRECT/213.154.128.18 -
1196170409.621 5326 208.167.225.68 TCP_MISS/200 421 CONNECT
65.220.11.24:25 - DIRECT/65.220.11.24 -
1196170410.099 885 64.237.46.132 TCP_MISS/200 429 CONNECT
64.18.4.13:25 - DIRECT/64.18.4.13 -
1196170410.241 1800 64.237.46.55 TCP_MISS/200 411 CONNECT
81.193.127.75:25 - DIRECT/81.193.127.75 -
1196170410.388 852 208.167.225.68 TCP_MISS/200 87 CONNECT
65.183.202.5:25 - DIRECT/65.183.202.5 -
1196170410.517 512 64.237.46.55 TCP_MISS/200 369 CONNECT
129.179.7.249:25 - DIRECT/129.179.7.249 -
1196170411.091 2823 64.237.46.55 TCP_MISS/200 489 CONNECT
194.25.134.8:25 - DIRECT/194.25.134.8 -
1196170411.716 1678 208.167.225.68 TCP_MISS/200 421 CONNECT
67.139.199.68:25 - DIRECT/67.139.199.68 -
1196170411.719 7196 208.167.225.68 TCP_MISS/200 2266 CONNECT
74.128.0.19:25 - DIRECT/74.128.0.19 -
1196170412.230 2212 64.237.46.55 TCP_MISS/200 409 CONNECT
202.216.228.86:25 - DIRECT/202.216.228.86 -
1196170412.380 8 64.237.46.55 TCP_MISS/503 0 CONNECT
207.44.208.37:25 - DIRECT/207.44.208.37 -
1196170412.384 2676 64.237.46.55 TCP_MISS/200 204 CONNECT
193.86.123.25:25 - DIRECT/193.86.123.25 -
1196170412.538 30581 64.237.46.132 TCP_MISS/200 0 CONNECT
206.46.232.11:25 - DIRECT/206.46.232.11 -
1196170413.732 1078 64.237.46.55 TCP_MISS/200 347 CONNECT
71.40.47.7:25 - DIRECT/71.40.47.7 -
1196170413.804 30987 64.237.46.132 TCP_MISS/200 286 CONNECT
64.18.7.10:25 - DIRECT/64.18.7.10 -
1196170413.908 1745 64.237.46.55 TCP_MISS/200 255 CONNECT
158.39.31.190:25 - DIRECT/158.39.31.190 -
1196170413.910 31616 64.237.46.132 TCP_MISS/200 180 CONNECT
194.88.228.80:25 - DIRECT/194.88.228.80 -
1196170414.076 850 64.237.46.55 TCP_MISS/200 341 CONNECT
63.254.35.250:25 - DIRECT/63.254.35.250 -
1196170414.404 5472 208.167.225.68 TCP_MISS/200 300 CONNECT
65.215.152.148:25 - DIRECT/65.215.152.148 -
1196170415.526 1812 64.237.46.55 TCP_MISS/200 328 CONNECT
209.139.247.226:25 - DIRECT/209.139.247.226 -
1196170415.596 929 208.167.225.68 TCP_MISS/200 257 CONNECT
64.18.6.13:25 - DIRECT/64.18.6.13 -
1196170415.607 742 64.237.46.55 TCP_MISS/200 432 CONNECT
63.255.0.140:25 - DIRECT/63.255.0.140 -
1196170416.001 59441 64.237.46.132 TCP_MISS/503 0 CONNECT
194.193.14.235:25 - DIRECT/194.193.14.235 -
1196170416.118 426 208.167.225.68 TCP_MISS/200 311 CONNECT
206.54.145.17:25 - DIRECT/206.54.145.17 -
1196170416.484 50 64.237.46.55 TCP_MISS/503 0 CONNECT
162.40.15.200:25 - DIRECT/162.40.15.200 -
1196170416.604 768 208.167.225.68 TCP_MISS/200 443 CONNECT
70.62.222.50:25 - DIRECT/70.62.222.50 -
1196170416.682 1210 64.237.46.55 TCP_MISS/200 241 CONNECT
194.159.138.87:25 - DIRECT/194.159.138.87 -
1196170417.010 59063 64.237.46.132 TCP_MISS/503 0 CONNECT
68.142.202.247:25 - DIRECT/68.142.202.247 -
1196170417.169 964 64.237.46.55 TCP_MISS/200 215 CONNECT
198.96.180.81:25 - DIRECT/198.96.180.81 -
1196170417.352 797 208.167.225.68 TCP_MISS/200 231 CONNECT
80.168.70.65:25 - DIRECT/80.168.70.65 -
1196170417.377 1073 208.167.225.68 TCP_MISS/200 318 CONNECT
69.20.101.219:25 - DIRECT/69.20.101.219 -
1196170417.649 30692 208.167.225.68 TCP_MISS/200 0 CONNECT
194.106.221.130:25 - DIRECT/194.106.221.130 -
1196170418.282 30006 64.237.46.132 TCP_MISS/200 1994 CONNECT
209.191.88.247:25 - DIRECT/209.191.88.247 -
1196170418.505 25804 208.167.225.68 TCP_MISS/200 723 CONNECT
204.127.217.16:25 - DIRECT/204.127.217.16 -
1196170418.884 1374 64.237.46.55 TCP_MISS/200 342 CONNECT
205.174.162.116:25 - DIRECT/205.174.162.116 -
1196170419.099 31938 64.237.46.132 TCP_MISS/200 193 CONNECT
216.86.100.72:25 - DIRECT/216.86.100.72 -
1196170419.181 30630 64.237.46.132 TCP_MISS/200 0 CONNECT
12.43.220.7:25 - DIRECT/12.43.220.7 -
1196170419.614 1078 208.167.225.68 TCP_MISS/200 407 CONNECT
75.126.136.142:25 - DIRECT/75.126.136.142 -
1196170419.659 1339 208.167.225.68 TCP_MISS/200 257 CONNECT
64.18.6.14:25 - DIRECT/64.18.6.14 -
1196170419.850 733 208.167.225.68 TCP_MISS/200 336 CONNECT
24.173.119.6:25 - DIRECT/24.173.119.6 -
1196170419.936 5533 208.167.225.68 TCP_MISS/200 174 CONNECT
203.112.24.188:25 - DIRECT/203.112.24.188 -
1196170420.102 4395 208.167.225.68 TCP_MISS/200 166 CONNECT
216.229.67.195:25 - DIRECT/216.229.67.195 -
1196170420.964 30718 64.237.46.132 TCP_MISS/200 0 CONNECT
195.252.127.36:25 - DIRECT/195.252.127.36 -
1196170421.105 1115 208.167.225.68 TCP_MISS/200 105 CONNECT
204.101.14.165:25 - DIRECT/204.101.14.165 -
1196170421.114 574 208.167.225.68 TCP_MISS/200 192 CONNECT
84.96.93.166:25 - DIRECT/84.96.93.166 -
1196170421.410 1829 208.167.225.68 TCP_MISS/200 234 CONNECT
195.76.174.39:25 - DIRECT/195.76.174.39 -
1196170421.602 171 208.167.225.68 TCP_MISS/200 78 CONNECT
24.71.223.11:25 - DIRECT/24.71.223.11 -
1196170421.848 155 208.167.225.68 TCP_MISS/200 78 CONNECT
24.71.223.11:25 - DIRECT/24.71.223.11 -
1196170421.858 645 64.237.46.55 TCP_MISS/200 328 CONNECT
69.20.116.136:25 - DIRECT/69.20.116.136 -
1196170421.957 59 64.237.46.55 TCP_MISS/200 0 CONNECT
64.18.5.10:25 - DIRECT/64.18.5.10 -
1196170422.101 30770 64.237.46.132 TCP_MISS/200 0 CONNECT
203.135.130.131:25 - DIRECT/203.135.130.131 -
1196170422.298 17913 64.237.46.55 TCP_MISS/200 577 CONNECT
168.95.5.19:25 - DIRECT/168.95.5.19 -
1196170422.551 1265 208.167.225.68 TCP_MISS/200 268 CONNECT
218.5.77.18:25 - DIRECT/218.5.77.18 -
1196170422.723 37 64.237.46.55 TCP_MISS/503 0 CONNECT
208.4.52.29:25 - DIRECT/208.4.52.29 -
1196170423.019 197 208.167.225.68 TCP_MISS/200 334 CONNECT
65.54.244.8:25 - DIRECT/65.54.244.8 -

----------------------------------------------------------------------------

As you can see thats nearly 100 hits in 8 seconds. I know this is
come kind of tool, but I cannot figure out a way to reproduce these
results.

Our conf for this server is as follows (Host Names and IP addresses
have been changed incase our other servers are also vulnerable):

----------------------------------------------------------------------------

http_port 3128
icp_port 3130

cache_dir ufs /var/spool/squid3 100 16 256
debug_options ALL,9

cache_peer xxx.xxx.xxx.xxx parent 443 7 ssl sslflags=DONT_VERIFY_PEER
no-query no-digest login=PASS originserver name=bradbury_ats_za
cache_peer xxx.xxx.xxx.xxx parent 443 7 ssl sslflags=DONT_VERIFY_PEER
no-query no-digest login=PASS originserver name=weasel_ats
cache_peer xxx.xxx.xxx.xxx parent 443 7 ssl sslflags=DONT_VERIFY_PEER
no-query no-digest login=PASS originserver name=reynolds_ats
cache_peer xxx.xxx.xxx.xxx parent 443 7 ssl sslflags=DONT_VERIFY_PEER
no-query no-digest login=PASS originserver name=asimov_ats

acl sites_on_bradbury_ats_za dstdomain stuff.us.com
acl sites_on_weasel_ats dstdomain stuff2.us.com
acl sites_on_reynolds_ats dstdomain stuff3.us.com
acl sites_on_reynolds_ats dstdomain stuff4.us.com
acl sites_on_asimov_ats dstdomain stuff5.us.com
acl sites_on_asimov_ats dstdomain stuff6.us.com
acl sites_on_asimov_ats dstdomain stuff7.us.com

cache_peer_access bradbury_ats_za allow sites_on_bradbury_ats_za
cache_peer_access weasel_ats allow sites_on_weasel_ats
cache_peer_access reynolds_ats allow sites_on_reynolds_ats
cache_peer_access asimov_ats allow sites_on_asimov_ats

acl all src 0.0.0.0/0.0.0.0
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 443 # https
acl CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports

http_access allow all
icp_access allow all

coredump_dir /var/spool/squid3

httpd_suppress_version_string on
visible_hostname proxy-us.hrsmart.com

----------------------------------------------------------------------------

Anyone have any idea how this was being done? If so please respond to
the list. If you know how to do this, I would appreciate a way to
reproduce this for my superiors.
Received on Thu Nov 29 2007 - 12:21:46 MST

This archive was generated by hypermail pre-2.1.9 : Sat Dec 01 2007 - 12:00:03 MST