EC-Council: Computer Hacking Forensic Investigator(CHFI-V10)
Module 8 : Network Forensics
         
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QID: 646  
   
You are running through a series of tests on your network to check for any security vulnerabilities. After normal working hours, you initiate a DoS attack against your external firewall. The firewall Quickly freezes up and becomes unusable. You then initiate an FTP connection from an external IP into your internal network. The connection is successful even though you have FTP blocked at the external firewall. What has happened??


 
A:    The firewall failed-bypass
 
B:    The firewall failed-closed
C:    The firewall ACL has been purged
  
D:    The firewall failed-open
  
         

 
 

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Comunity Comments:

Banwari on 21/05/2025
Opted Answer: D
A fail-open firewall refers to a scenario where a firewall, upon failure, allows all network traffic to pass through unrestricted instead of blocking it.

if the firewall encounters a failure, it automatically blocks all network traffic instead of allowing unrestricted access. This approach prioritizes security over availability, ensuring that no unauthorized connections can occur during a system failure.

a firewall failed-bypass, meaning the firewall did not fail in a conventional open or closed state but instead allowed unauthorized traffic to pass through, bypassing its security rules. This type of failure can occur due to misconfigurations, software vulnerabilities, or unexpected system behavior under stress.

firewall ACL (Access Control List) has been purged, meaning the firewall‘s security rules were erased or reset, allowing unrestricted access. ACLs are crucial for defining which traffic is permitted or denied, and their removal can expose the network to unauthorized connections
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