45. Remote users report that they are unable to log in to the VPN. The help desk confirms that each employee has a stable internet connection and correct permissions for VPN use but also identifies similar login errors for all affected users. Which of the following types of attacks most likely occurred?
Answer: D
DDoS
A Distributed Denial of Service (DDoS) attack is likely responsible for the inability of remote users to log in to the VPN, as it overwhelms the network with excessive traffic, making legitimate access impossible. The report of similar login errors among all affected users further supports this conclusion, indicating a systemic issue rather than a localized one.
A) Collision
Collision attacks involve two inputs producing the same hash output, typically relevant in cryptographic contexts. This type of attack does not affect user login processes or network access, making it an incorrect choice for the scenario presented.
B) Spraying
Credential spraying involves attempting to access multiple accounts with a few common passwords. However, in this case, all employees have been confirmed to have correct permissions, indicating that password-related issues are not the cause of the login failures, thus making this option incorrect.
C) On-path
On-path attacks occur when an attacker intercepts the communication between users and the service, potentially capturing credentials. In this scenario, since users have stable connections and permissions, the systemic login failure points more towards a network overload rather than an interception issue, rendering this option incorrect.
D) DDoS
A DDoS attack floods the network with traffic, preventing legitimate users from accessing services like the VPN. Given that all affected remote users are experiencing similar login issues, a DDoS attack is the most plausible explanation for the widespread login failures.
Conclusion
The DDoS option is definitively correct as it directly correlates with the symptoms described, which include multiple users facing the same login errors despite having proper access. The other options fail to account for the systemic nature of the issue, thereby confirming the likelihood of a DDoS attack as the cause of the VPN login failures.