The correct answer is that the target has a null session vulnerability that allows access to admin shares. This is because a null session occurs when Windows or Samba permits an unauthenticated connection to the IPC$ share, which can then be leveraged to access administrative shares like C$ without credentials, as shown by the `ls \\192.168.1.20\C$` command output. On the Certified Ethical Hacker CEH exam, this scenario tests your understanding of SMB enumeration and legacy Windows security flaws, often appearing in questions about network service misconfigurations or lateral movement techniques. A common trap is confusing null sessions with weak passwords—remember that null means no password at all, not a blank one. Memory tip: think “null = no credentials, admin shares = full access” to recall that IPC$ is the gateway to C$ and other hidden drives in older systems.
CEH Enumeration and System Hacking Practice Question
This CEH practice question tests your understanding of enumeration and system hacking. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A penetration tester captures the following output from a command: 'smb: \> ls \\192.168.1.20\C$'. The tester is able to list the contents of the C$ share without providing credentials. Which of the following is the MOST likely reason for this access?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The target has a null session vulnerability that allows access to admin shares
The output shows the tester successfully listing the C$ share (a default administrative share) without providing credentials. This is a classic indicator of a null session vulnerability, where Windows allows unauthenticated access to IPC$ and, in some configurations, admin shares via SMB. The tester is leveraging the default null session to enumerate or access these shares, which is a well-known weakness in older Windows systems or misconfigured Samba servers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The C$ share is intentionally shared with Everyone
Why it's wrong here
Administrative shares are not shared with Everyone by default.
✗
The target is running a Samba server with weak permissions
Why it's wrong here
Samba does not expose C$ by default; it's a Windows feature.
✓
The target has a null session vulnerability that allows access to admin shares
Why this is correct
Older Windows versions or misconfigured systems allow null sessions to admin shares.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tester is using a pass-the-hash attack
Why it's wrong here
Pass-the-hash requires a hash; the scenario says no credentials.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse null session access with pass-the-hash or weak permissions, but the key clue is the absence of any credential usage in the command, which directly points to the null session vulnerability.
Trap categories for this question
Scenario analysis trap
Pass-the-hash requires a hash; the scenario says no credentials.
Detailed technical explanation
How to think about this question
Null session vulnerabilities exploit the IPC$ share (interprocess communication) over SMB on port 445, allowing an unauthenticated user to establish a session with no credentials. Once a null session is established, tools like smbclient can enumerate users, shares, and even access admin shares if the target is misconfigured (e.g., RestrictAnonymous set to 0 in older Windows). In modern Windows, this is mitigated by default, but legacy systems or improperly hardened Samba servers remain vulnerable.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The target has a null session vulnerability that allows access to admin shares — The output shows the tester successfully listing the C$ share (a default administrative share) without providing credentials. This is a classic indicator of a null session vulnerability, where Windows allows unauthenticated access to IPC$ and, in some configurations, admin shares via SMB. The tester is leveraging the default null session to enumerate or access these shares, which is a well-known weakness in older Windows systems or misconfigured Samba servers.
What should I do if I get this CEH question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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