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問題 #68
What is the best practice to protect against malware?
答案：A
解題說明：
The most effective and fundamental master information security control for protecting against malicious software is the installation and regular updating of antivirus software. Malware, which includes viruses, Trojans, and ransomware, is specifically designed to damage, infect, or steal data from a computer system without the owner's consent. Antivirus software serves as a critical defense layer by scanning files and monitoring system behavior to detect and neutralize these threats before they can execute their malicious payload.
However, simply having the software installed is insufficient; it must be kept up to date. Hackers and malware developers are constantly creating new "variants" of software designed to bypass existing security signatures.
Modern antivirus programs receive frequent updates containing the latest "definitions" or "signatures" of known malware, as well as heuristic analysis updates that help identify suspicious behavior from previously unknown threats.
Beyond antivirus, protecting against malware requires a multi-layered approach that includes administrative and technical controls. This involves the "periodic updating of the operating system" to patch vulnerabilities that malware might exploit to gain entry. It also requires "Security Awareness," where users are taught to avoid clicking on suspicious links or sharing credentials, as these are common infection vectors used in social engineering attacks. By combining automated technical defenses (antivirus) with proactive maintenance (patching) and user education, an organization can significantly mitigate the risk of a malware infection. This holistic strategy ensures that even if one control fails, other layers of defense are in place to safeguard the integrity and confidentiality of the organization's data.
問題 #69
What is privilege escalation?
答案：C
解題說明：
Privilege escalation is a critical concept in ethical hacking and penetration testing that refers to a situation where a user or processgains higher-level permissions than originally authorized. This makes option A the correct answer.
Privilege escalation commonly occurs after an attacker or ethical hacker gains initial access to a system with limited privileges. The next objective is often to escalate those privileges to gain administrative or root-level access. This can be achieved through misconfigurations, vulnerable software, weak file permissions, kernel exploits, or improper access control mechanisms.
Option B is incorrect because formally requesting permissions from an administrator is a legitimate administrative process, not privilege escalation. Option C is incorrect because privilege escalation does not involve requesting permissions; it involves exploiting weaknesses to obtain them without authorization.
In penetration testing, privilege escalation is typically tested during thepost-exploitation phase. Ethical hackers use it to demonstrate the potential impact of a breach, such as full system compromise, access to sensitive data, or lateral movement within a network.
Understanding privilege escalation is essential for improving defensive security. By identifying and mitigating escalation paths, organizations can enforce the principle of least privilege, strengthen access controls, and reduce the impact of successful attacks. Ethical testing of privilege escalation ultimately helps organizations harden systems against real-world threats.
問題 #70
What is ZAP?
答案：B
解題說明：
The OWASP Zed Attack Proxy (ZAP) is one of the world's most popular free, open-source security tools for finding vulnerabilities in web applications. It is actively maintained by a global community of volunteers under the Open Web Application Security Project (OWASP). ZAP acts as a "man-in-the-middle proxy," meaning it sits between the tester's web browser and the web application being tested. This allows the tester to intercept, inspect, and even modify the requests and responses traveling between the two.
ZAP provides a wide array of functionalities essential for theWeb Application Pentestingprocess:
* Automated Scanner: It can automatically crawl a website to find vulnerabilities like SQL injection, Cross-Site Scripting (XSS), and insecure headers.
* Spidering: It maps out the structure of a website by following every link it finds.
* Fuzzing: It can send many variations of malicious input to a specific field to see if it can break the application or trigger an error.
* Active and Passive Scanning: It can passively watch traffic to find easy-to-spot issues or actively probe the server for deeper flaws.
For ethical hackers, ZAP is often compared to the commercial tool Burp Suite. While both perform similar tasks, ZAP's open-source nature and robust API make it a favorite for integrating into "DevSecOps" pipelines, where it can automatically test new code for vulnerabilities before it is deployed. Mastering ZAP is a core skill for any professional focused on securing the web-facing assets of an organization.
問題 #71
What is privilege escalation?
答案：B
解題說明：
Privilege escalation is a critical phase in the cyber-attack lifecycle where an adversary seeks to expand their influence within a target environment after gaining an initial foothold. In standard security architectures, users are granted the "least privilege" necessary to perform their duties; however, attackers aim to bypass these restrictions to access sensitive data or execute restricted commands. This process is categorized into two distinct dimensions: horizontal and vertical escalation.
Horizontal privilege escalation(also known as lateral movement) occurs when an attacker gains access to resources belonging to another user with a similar level of permissions. This is often achieved through credential theft, session hijacking, or exploiting vulnerabilities in peer-level applications. While the attacker's authorization level remains the same, their reach increases as they assume different identities.
Vertical privilege escalation, or privilege elevation, is the process of moving from a standard user account to one with higher administrative or "root" privileges. This typically involves exploiting system bugs, misconfigurations, or unpatched vulnerabilities in the kernel or operating system. For instance, an attacker might use an exploit to trick a high-privileged service into executing malicious code on their behalf. Gaining root or administrator status is often the ultimate goal for an attacker, as it provides unrestricted control over the entire system, allowing for the deployment of malware, modification of security logs, and total data exfiltration. Effective defense against this threat involves implementing zero-trust architectures, rigorous patch management, and continuous monitoring for unauthorized permission changes.
問題 #72
What is a passive recognition?
答案：B
解題說明：
Passive recognition (or passive reconnaissance) is the foundational phase of any ethical hacking or penetration testing engagement. Its primary objective is to collect as much intelligence as possible about a target while remaining completely undetectable. The hallmark of a passive approach is that itnever involves direct interactionwith the target's infrastructure. By avoiding the transmission of packets directly to the target's servers, the attacker or tester ensures that no logs are generated and no intrusion detection systems (IDS) or firewalls are triggered.
Instead, ethical hackers leverageOpen-Source Intelligence (OSINT)and third-party data sources. Common techniques include:
* WHOIS and DNS Lookups: Querying public registries to find domain ownership, administrative contacts, and subdomains.
* Social Media Analysis: Scraping platforms like LinkedIn or Twitter to identify key employees, their roles, and potential technologies used by the firm.
* Search Engine Probing: Using "Google Dorking" to find exposed documents, metadata, or forgotten directories that might contain software version numbers or usernames.
* Analyzing Public Databases: Checking repositories like GitHub for leaked source code or credentials.
The primary advantage of passive recognition is stealth; it allows a penetration tester to map a target's
"footprint" without alerting security teams to an impending assessment. While the data gathered passively may occasionally be less precise than that obtained through active probing (like port scanning), it provides a low-risk way to identify broad vulnerabilities and potential entry points. It is a critical step in building a comprehensive picture of a target's security landscape before moving into more intrusive phases.
問題 #73
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