CertMaster PenTest+ Practice Test 2025 – The All-in-One Guide to Master Your Certification!

When a penetration tester takes advantage of a misconfigured Windows service, one effective action is to replace a legitimate DLL with a malicious one. Windows services often rely on dynamic link libraries (DLLs) to perform their functions. If the service is misconfigured, particularly if it can be modified or if it improperly validates the integrity or location of the DLL it uses, an attacker can substitute the intended DLL with a malicious version.

This action can allow the attacker to gain further control or execute arbitrary code under the context of that service. The service runs with certain privileges that may be higher than those of a normal user, which can lead to escalating privileges within the system. This technique is not uncommon in exploitation, making it a likely action for penetration testers to assess security weaknesses and the potential impact of such a misconfiguration.

In contrast to the other options, which focus on hardening or modifying security settings, replacing a DLL directly exploits the vulnerability inherent in the misconfiguration, demonstrating a more aggressive approach to gaining unauthorized access or control over the system's functionality.