OpenAsset Digital Asset Management IP Access Control Bypass

`Title: IP access control bypass  
  
  
  
Product: OpenAsset Digital Asset Management by OpenAsset  
  
  
  
Vendor Homepage: https://www.openasset.com/  
  
  
  
Vulnerable Version: 12.0.19 (Cloud) 11.2.1 (On-premise)  
  
  
  
Fixed Version: 12.0.20 (Cloud) 11.4.10 (On-premise)  
  
  
  
CVE Number: CVE-2020-28856  
  
  
  
Author: Jack Misiura from The Missing Link   
  
  
  
Website: https://www.themissinglink.com.au  
  
  
  
Timeline:  
  
  
  
2020-11-14 Disclosed to Vendor  
  
2020-12-04 Vendor releases final patches  
  
2020-12-10 Publication  
  
  
  
1. Vulnerability Description  
  
  
  
The OpenAsset Digital Asset Management web application allowed for spoofing of IP addresses by using X-Forwarded-For header. By default, the web application would allow all traffic in for 127.0.0.1, in order to prevent users from accidentally blocking themselves.  
  
  
  
2. PoC  
  
  
  
Ensure a web application endpoint has been blocked for a specific IP address or alternatively, use a * to block all IP address. Confirm the block is in place by attempting to make a request to the endpoint. Next, add the following to the request header:  
  
  
  
X-Forwarded-For: 127.0.0.1  
  
  
  
The request will not be blocked, allowing access to potentially dangerous endpoints or sensitive data.  
  
  
  
3. Solution  
  
  
  
The vendor provides an updated version (11.4.10) which should be installed immediately. If using the cloud version, the vendor has already updated it.  
  
  
  
4. Advisory URL  
  
  
  
https://www.themissinglink.com.au/security-advisories  
`