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Elber Wayber Analog/Digital Audio STL 4.00 Authentication Bypass

Critical
Advisory ID
ZSL-2024-5822
Release Date
17 April 2024
Vendor
Elber S.r.l. - https://www.elber.it
Affected Version
Version 3.0.0 Revision 1553 (Firmware Ver. 4.00 Rev. 1501), Version 3.0.0 Revision 1542 (Firmware Ver. 4.00 Rev. 1516), Version 3.0.0 Revision 1530 (Firmware Ver. 4.00 Rev. 1516), Version 3.0.0 Revision 1530 (Firmware Ver. 4.00 Rev. 1501), Version 3.0.0 Revision 1480 (Firmware Ver. 3.00 Rev. 1350), Version 3.0.0 Revision 1480 (Firmware Ver. 3.00 Rev. 1342), Version 1.0.0 Revision 1202 (Firmware Ver. 2.00 Rev. 2131)
CVE
N/A
Tested On
NBFM Controller, embOS/IP
Summary

Wayber II is the name of an analogue/digital microwave link able to transport a Mono or a MPX stereo signal from studio to audio transmitter. Compact and reliable, it features very high quality and modern technology both in signal processing and microwave section leading to outstanding performances.

Description

The device suffers from an authentication bypass vulnerability through a direct and unauthorized access to the password management functionality. The issue allows attackers to bypass authentication by manipulating the set_pwd endpoint that enables them to overwrite the password of any user within the system. This grants unauthorized and administrative access to protected areas of the application compromising the device's system security.

Proof of Concept
Disclosure Timeline
18.08.2023Vulnerability discovered.
20.08.2023Vendor contacted.
29.09.2023No response from the vendor.
09.12.2023Vendor contacted.
02.02.2024No response from the vendor.
16.03.2024Vendor contacted.
16.04.2024No response from the vendor.
17.04.2024Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
17.04.2024Initial release
22.05.2024Added reference [1] and [2]
18.09.2024Added reference [3]