Sielco Analog FM Transmitter 2.12 'id' Cookie Brute Force Session Hijacking

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 Cookie session ID 'id' is of an insufficient length and
can be exploited by brute force, which may allow a remote attacker
to obtain a valid session, bypass authentication and manipulate
the transmitter.

Tested on: lwIP/2.1.1

Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

Advisory ID: ZSL-2023-5758
Advisory URL:



# Session values (len=5)

Cookie: id=44189
Cookie: id=37692
Cookie: id=+6638
Cookie: id=+3077