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XL-19-010 - ABB IDAL HTTP Server Authentication Bypass Vulnerability  
========================================================================  
  
Identifiers  
-----------  
XL-19-010  
CVE-2019-7226  
ABBVU-IAMF-1902005  
  
  
CVSS Score  
----------  
8.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)  
  
  
Affected vendor  
---------------  
ABB (new.abb.com)  
  
  
Credit  
------  
Eldar Marcussen - xen1thLabs - Software Labs  
  
  
Vulnerability summary  
---------------------  
The IDAL HTTP server CGI interface contains a URL, which allows an unauthenticated attacker to bypass authentication and gain access to privileged functions.  
  
  
Technical details  
-----------------  
In the IDAL CGI interface, there is a URL (/cgi/loginDefaultUser), which will create a session in an authenticated state and return the session ID along with the username and plaintext password of the user. An attacker can then login with the provided credentials or supply the string 'IDALToken=......' in a cookie which will allow them to perform privileged operations such as restarting the service with /cgi/restart.  
  
Proof of concept  
----------------  
```  
GET http://localhost:81/cgi/loginDefaultUser  
````  
  
1  
#S_OK  
IDALToken=532c8632b86694f0232a68a0897a145c  
admin  
adminpass  
  
Affected systems  
----------------  
PB610 Panel Builder 600, order code: 1SAP500900R0101, versions 1.91 ... 2.8.0.367  
  
  
Solution  
--------  
Apply the patches and instructions from vendor:  
- ABB PB610 - https://search.abb.com/library/Download.aspx?DocumentID=3ADR010377&LanguageCode=en&DocumentPartId=&Action=Launch  
  
  
Disclosure timeline  
-------------------  
04/02/2019 - Contacted ABB requesting disclosure coordination  
05/02/2019 - Provided vulnerability details  
05/06/2019 - Patch available  
17/06/2019 - xen1thLabs public disclosure