Title: Elber Wayber Analog/Digital Audio STL 4.00 Authentication Bypass
Advisory ID: ZSL-2024-5822
Type: Local/Remote
Impact: Security Bypass, Privilege Escalation, System Access, DoS
Risk: (5/5)
Release Date: 17.04.2024

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.

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)

Tested On

NBFM Controller
embOS/IP

Vendor Status

[18.08.2023] Vulnerability discovered.
[20.08.2023] Vendor contacted.
[29.09.2023] No response from the vendor.
[09.12.2023] Vendor contacted.
[02.02.2024] No response from the vendor.
[16.03.2024] Vendor contacted.
[16.04.2024] No response from the vendor.
[17.04.2024] Public security advisory released.

PoC

elber_wayber_auth.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://packetstormsecurity.com/files/178142/Elber-Wayber-Analog-Digital-Audio-STL-4.00-Authentication-Bypass.html
[2] https://cxsecurity.com/issue/WLB-2024040054
[3] https://www.exploit-db.com/exploits/52071

Changelog

[17.04.2024] - Initial release
[22.05.2024] - Added reference [1] and [2]
[18.09.2024] - Added reference [3]

Contact

Zero Science Lab

Web: https://www.zeroscience.mk
e-mail: lab@zeroscience.mk