312-50v13 Exam Dumps - Certified Ethical Hacker Exam (CEHv13)

RST hijacking is a TCP session hijacking technique emphasized in CEH materials under network attacks against established communications. In TCP, a Reset flag packet is used to abruptly tear down a connection. If an attacker can observe the session and determine the correct parameters such as IP addresses, ports, and an in-window sequence number, they can forge a TCP RST packet that appears to come from one endpoint. This can force the victim side to drop the session, making the legitimate client suddenly lose responsiveness.

The key clue in the scenario is that Rachel “observes a client-server communication” and then injects crafted packets that disrupt the client while the server continues to communicate with Rachel’s system. That behavior matches the practical use of RST hijacking in demonstrations: terminate or desynchronize the victim endpoint while keeping the server-side session usable long enough for the attacker to inject traffic with valid sequence and acknowledgment values. In a switched LAN, this is often paired with sniffing or traffic visibility to reliably craft the reset packet and subsequent injected packets.

Blind hijacking is different because the attacker cannot see the traffic and must guess sequence numbers, which contradicts the “observes communication” detail. UDP hijacking is not applicable because UDP is connectionless and does not use session state or RST flags. “TCP/IP hijacking” is a broad category, but the question asks for the specific technique used to disrupt the client via crafted packets, which is best identified as RST hijacking.

The CEH v13 content explains that stealth scanning involves modifying scan timing parameters to reduce packet frequency, randomize intervals, and avoid recognizable patterns typically flagged by intrusion detection systems. Slow, randomized timing—often achieved with Nmap’s T0 or T1 timing templates—prevents bursts of traffic and allows scans to blend into normal network noise. IDS/IPS systems tuned for high-volume events may fail to detect such gradual reconnaissance. Fast SYN scans generate distinctive patterns easily identified by security monitoring tools. UDP scans, especially across all ports, produce high traffic volume and are extremely noisy. Xmas scans, although sometimes used for stealth against stateless filters, are still signature-detectable and inappropriate when stealth over time is required. Therefore, applying slow, randomized timing options aligns with CEH-approved reconnaissance techniques for evading detection while enumerating open ports.

CEH v13 explains that when traditional enumeration techniques—such as SMB null sessions—are disabled, attackers often pivot to misconfigured LDAP services that still allow anonymous binding. LDAP anonymous bind, when not properly restricted, exposes directory information such as usernames, organizational units, group memberships, and other metadata. This aligns directly with the scenario, where the tester must avoid triggering alarms while still gathering internal data. LDAP queries generate minimal noise, often blending with normal authentication-related traffic, making them ideal for covert enumeration. Options A and C would require authentication or violate access restrictions, and DNS zone transfers (Option D) rarely succeed because modern DNS servers disable AXFR requests from unauthorized clients. CEH repeatedly stresses the importance of detecting and securing LDAP anonymous bind due to its potential for silent information leakage—making Option B the correct choice.

CEH v13 outlines a structured approach to vulnerability assessment and exploitation. After identifying a high-severity vulnerability, the next critical step is verification and research, not immediate exploitation. This ensures accuracy, reduces false positives, and avoids unnecessary risk. CEH emphasizes that testers must validate vulnerability details, confirm version applicability, assess exploit availability (e.g., Metasploit, Exploit-DB), and evaluate potential impact. Attempting DoS attacks (Option A) is prohibited unless explicitly scoped and does not align with responsible testing. Brute-force attacks (Option B) are unrelated to software version vulnerabilities. Ignoring the issue (Option D) violates CEH methodology. The correct process is to research and verify—ensuring exploitation is safe, relevant, and authorized. This aligns with CEH’s vulnerability management lifecycle: discovery → verification → prioritization → exploitation (when allowed) → reporting.

CEH v13 explains that fingerprinting is a core reconnaissance technique used to identify software versions, server types, and configurations by analyzing how systems respond to crafted or abnormal input. When testers send malformed HTTP verbs, unusual headers, or atypical URI structures, the server’s specific response codes, banners, and error messages reveal distinctive behavioral patterns. These patterns allow tools like httprint, Nmap NSE scripts, and custom probes to match the responses to known server profiles. This technique is part of active reconnaissance, enabling attackers to determine vulnerabilities associated with specific versions. Phishing (Option B) is unrelated to protocol analysis. Session fixation (Option C) manipulates session identifiers, not HTTP response patterns. Persistent XSS (Option D) relies on web application vulnerabilities, not server fingerprinting. Thus, the tester is performing HTTP-based server fingerprinting.

The correct answer is D. ldapsearch -h < host > -x -s base namingContexts.

The goal is to query the directory server’s root DSE for exposed naming contexts. The -x option performs simple authentication, -s base limits the search scope to the base object, and namingContexts requests the attribute that lists available naming contexts, such as domain and configuration partitions.

CEH-aligned LDAP enumeration material explains that LDAP directory services provide information about users, systems, networks, services, and organizational structure, and that LDAP enumeration can reveal domain and directory details useful for later targeting .

Option A is incorrect because it assumes a known base DN before discovering the naming contexts.

Option B is incomplete because it does not request the naming context attribute.

Option C also assumes the base DN is already known.

Option D is correct because it retrieves base-level naming context information before deeper LDAP searches.

Therefore, the best answer is D. ldapsearch -h < host > -x -s base namingContexts.

CEH v13 identifies kernel-level rootkits as among the most dangerous malware types. Because they operate at the lowest OS level, they can hide processes, files, and system calls.

CEH v13 states that the only guaranteed remediation is a complete system wipe and clean OS reinstallation from a trusted source. Attempting removal risks incomplete eradication.

Powering down alone does not remove the rootkit. Honeypots are for detection, not remediation. Tailored removal tools may fail at kernel depth.

Thus, Option C is correct.

Passive reconnaissance is emphasized throughout CEH as an essential method for gathering intelligence without alerting monitoring systems. When the tester cannot interact with the live site, they must rely entirely on third-party archives or cached content stored by search engines or internet archival services. Google’s cache function provides previously stored versions of web pages exactly for this purpose. CEH explains that attackers frequently use cached content to retrieve outdated login portals, administrative pages, exposed directories, or other sensitive elements that may no longer appear on the live web server. Unlike operators such as intext or intitle, which query live indexed metadata, the cache operator retrieves historical snapshots without accessing the target website. The link operator identifies backlinks but does not provide historical page content. Only the cache operator directly supports viewing previous versions of pages passively, aligning perfectly with the requirement to avoid detection while gathering intelligence on legacy web content.