Hash injection attack allows attackers to inject a compromised hash into a local session and use the hash to validate network resources.

• A. True
• B. False
• C. Cannot be determined
• D. Not applicable

Answer: (A)

A hash-based authentication attack can indeed use a stolen hash to prove identity to network resources without knowing the plaintext password. In many systems, especially Windows with NTLM, the server accepts the NTLM hash as the credential. An attacker who obtains or crafts a compromised hash can inject that hash into the current session or use it in place of a password to access remote services. This is the essence of pass-the-hash or hash injection tactics: the hash itself is reused to authenticate, allowing access to resources without needing the actual password.

In modern environments, protections like Kerberos, credential Guard, or strong signing can reduce or mitigate this risk, but the described scenario is a valid technique in environments susceptible to hash-based authentication.