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Which action would most effectively increase the security of a virtual-hosted web server?
According to CEH v13 Web Application and Server Security, regular patching and updates are the most effective way to reduce server attack surfaces. Vulnerabilities in web servers, proxies, and supporting services are frequently exploited if patches are delayed.
While architectural choices and directory placement influence organization, they do not mitigate known vulnerabilities. Changing IP addresses does not prevent exploitation, and moving directories does not address underlying software flaws.
CEH v13 consistently emphasizes patch management as a primary defensive control. Therefore, Option C is correct.
In the early morning light filtering through the blinds of a secure analytics laboratory, ethical hacker and cryptanalyst Sanya Patel was reviewing the integrity-verification system used by a major logistics software provider. The system generated a fixed-length hexadecimal fingerprint for every software package and configuration file uploaded, and she observed that this fingerprint was always exactly 128 hexadecimal characters long. When she deliberately altered a single byte in a test package, the resulting fingerprint changed completely and unpredictably.
Further testing confirmed that the verification process relied on this fingerprint to detect tampering during distribution or storage. The function produced completely different outputs from nearly identical inputs while maintaining the same output length regardless of file size.
Which message-digest function is most likely being used by the platform?
WHIRLPOOL produces a 512-bit message digest. Because each hexadecimal character represents four bits, a 512-bit digest is displayed as hexadecimal characters. This exactly matches the observed fingerprint length, making option C correct. WHIRLPOOL also exhibits the avalanche effect: a small input change produces a substantially different digest while the output remains fixed in length.
Tiger normally produces a 192-bit digest, represented by 48 hexadecimal characters. BLAKE3 uses a 256-bit default output, although its extendable-output design can generate other lengths; nothing in the scenario indicates that a non-default extended output was configured. MD2 produces a 128-bit digest, represented by only 32 hexadecimal characters.
A system administrator observes that several machines in the network are repeatedly sending out traffic to unknown IP addresses. Upon inspection, these machines were part of a coordinated spam campaign. What is the most probable cause?
CEH defines botnets as networks of compromised machines controlled remotely to perform coordinated activities such as DDoS attacks, spam campaigns, and credential theft. Systems showing outbound connections to unknown IPs and participating in mass spam dissemination are characteristic indicators of botnet infection.
A system allows execution from /tmp directory. What risk exists?
The correct answer is A because allowing execution from /tmp creates a direct risk that an attacker can place and run malicious binaries, scripts, droppers, or payloads from a temporary directory. In Linux, /tmp is commonly used for temporary files, and if execution is permitted, it becomes an attractive staging location after compromise. CEH malware concepts define malware as malicious software designed to gain access to target machines, steal information, harm systems, or give control to an attacker. CEH system-hacking concepts also describe malicious application execution after access, including installing malware, setting up backdoors, password crackers, and keyloggers. This risk is not SQL injection or XSS, because those are web application input attacks. It is also not primarily DoS, although malware could later cause denial of service. The immediate and best answer is malware execution because executable temporary directories let attackers run hostile code from a writable location.
This type of security test might seek to target the CEO's laptop or the organization's backup tapes to extract critical information, usernames, and passwords.
The correct answer is A. Stolen equipment. In CEH ethical hacking methodology, ''stolen equipment'' is a mode of ethical hacking that simulates theft of a critical information resource, such as a laptop owned by an important organizational user, and then provides that asset to the ethical hacker for assessment. The question specifically mentions targeting the CEO's laptop or backup tapes to extract critical information, usernames, and passwords. These are classic examples of sensitive assets that may contain cached credentials, confidential documents, password hashes, VPN profiles, email archives, or backup copies of production data. This test evaluates whether protections such as full-disk encryption, strong authentication, secure backup handling, and data-at-rest controls are effective. ''Physical entry'' focuses on entering and compromising the organization's facilities or ICT infrastructure, while ''insider attack'' simulates a trusted internal user abusing access. ''Outsider attack'' typically represents an external threat. Because the focus is on stolen laptops and backup media, the best CEH answer is stolen equipment.
