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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Reporting and Communication | 17% | - Reporting requirements and standards
|
| Topic 2: Incident Response Management | 20% | - Digital forensics basics
|
| Topic 3: Vulnerability Management | 30% | - Vulnerability assessment processes
|
| Topic 4: Security Operations | 33% | - Automation and orchestration
|
>> Detailed CS0-003 Answers <<
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NEW QUESTION # 191
In the last hour, a high volume of failed RDP authentication attempts has been logged on a critical server. All of the authentication attempts originated from the same remote IP address and made use of a single valid domain user account. Which of the following mitigating controls would be most effective to reduce the rate of success of this brute-force attack? (Select two).
Answer: E,F
Explanation:
To mitigate brute-force attacks, implementing an account lockout policy (C) prevents continuous attempts by locking the account after a set number of failed logins. Blocking inbound connections on TCP port 3389 (RDP) from untrusted IP addresses (F) limits access, reducing the attack surface. According to CompTIA Security+, these controls effectively prevent unauthorized access. While blocking specific IPs (D) or disabling RDP (E) can also help, the lockout and firewall rules provide broader, proactive protection against this attack type.
NEW QUESTION # 192
A security analyst runs the following command:
# nmap -T4 -F 192.168.30.30
Starting nmap 7.6
Host is up (0.13s latency)
PORT STATE SERVICE
23/tcp open telnet
443/tcp open https
636/tcp open ldaps
Which of the following should the analyst recommend first to harden the system?
Answer: C
Explanation:
Comprehensive Detailed Explanation:The nmap scan results show that Telnet (port 23) is open. Telnet transmits data, including credentials, in plaintext, which is insecure and should be disabled to enhance security. Here's an explanation of each option:
* A. Disable all protocols that do not use encryption
* Explanation: Disabling unencrypted protocols (such as Telnet) reduces exposure to man-in-the- middle (MITM) attacks and credential sniffing. Telnet should be replaced with a secure protocol like SSH, which provides encryption for transmitted data.
* B. Configure client certificates for domain services
* Explanation: While client certificates enhance authentication security, they are more relevant to services like LDAP over SSL (port 636), which is already secure. This would not address the Telnet vulnerability.
* C. Ensure that this system is behind a NGFW
* Explanation: A Next-Generation Firewall (NGFW) provides enhanced network security, but it may not mitigate the risks of unencrypted protocols if they are allowed internally.
* D. Deploy a publicly trusted root CA for secure websites
* Explanation: Public root CAs are used for website authentication and encryption, relevant only if this system is hosting a publicly accessible HTTPS service. It would not impact Telnet security.
References:
* CIS Controls: Recommendations on secure configurations, especially the use of encrypted protocols.
* NIST SP 800-47: Security considerations for network protocols, emphasizing encrypted alternatives like SSH over Telnet.
NEW QUESTION # 193
You are a penetration tester who is reviewing the system hardening guidelines for a company. Hardening guidelines indicate the following.
There must be one primary server or service per device.
Only default port should be used
Non- secure protocols should be disabled.
The corporate internet presence should be placed in a protected subnet
Instructions :
Using the available tools, discover devices on the corporate network and the services running on these devices.
You must determine
ip address of each device
The primary server or service each device
The protocols that should be disabled based on the hardening guidelines
Answer:
Explanation:
see the answer below in explanation:
Explanation
Answer below images
A computer screen with white text Description automatically generated
NEW QUESTION # 194
A cybersecurity analyst has recovered a recently compromised server to its previous state. Which of the following should the analyst perform next?
Answer: B
Explanation:
After recovering a compromised server to its previous state, the analyst should perform forensic analysis to determine the root cause, impact, and scope of the incident, as well as to identify any indicators of compromise, evidence, or artifacts that can be used for further investigation or prosecution. References:
CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 6, page 244; CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 6, page 253.
NEW QUESTION # 195
An analyst is reviewing processes running on a Windows host. The analyst reviews the following information:
Which of the following processes should the analyst review first?
Answer: D
Explanation:
The analyst should review PID 768 first because it is the parent process of another suspicious process (PID
1100) and it is also highly suspicious itself due to its unexpected file path.
Why PID 768 is the best first process to review
* Path anomaly (strong IoC): Legitimate Windows binaries like calc.exe and cmd.exe are normally found in trusted OS directories (e.g., C:\Windows\System32\). In the table, both CALC.exe and CMD.exe appear in a user's Documents folder (C:\Users\JDoe\Documents\...). That is a classic sign of masquerading (a malicious binary using a legitimate-sounding name). The All-in-One guide explicitly describes how attackers disguise malicious processes by using legitimate-sounding names and mimicking system processes.
* Parent-child relationship (investigation priority): PID 1100 (Documents\CMD.exe) is suspicious, but it is a child of PID 768 (Documents\CALC.exe). Investigating the parent first helps you understand what spawned the suspicious child, what activity preceded it, and whether PID 768 is the root of the execution chain. The All-in-One guide highlights that analysts should examine process parent-child relationships and investigate unexpected dependencies as a way to detect malicious activity:Exact extract (All-in-One Exam Guide): "Analyze process dependencies Examine process parent-child relationships and investigate any unexpected or unusual dependencies that may indicate malicious activity." It also emphasizes monitoring grandparent/parent/child relationships to detect deviations from normal process hierarchies:Exact extract (All-in-One Exam Guide): "Monitoring the relationships between processes, particularly grandparent, parent, and child relationships, can be a valuable method for detecting unusual activity."
* Abused/LOLBIN context: cmd.exe is a commonly abused Windows utility in attacks. The Sybex Study Guide notes that attackers often abuse built-in tools and that abnormal OS process behavior involving tools like cmd.exe can indicate compromise:Exact extract (Sybex Study Guide): "For Windows systems, a handful of built-in tools are most commonly associated with attacks like these, including cmd.exe..." Why the other options are less correct
* A (533) and B (740) are running from C:\Windows\System32\... which is the expected location for legitimate Windows binaries in normal circumstances, so they're less suspicious than the copies running from a user Documents folder.
* D (1100) is suspicious, but it is a child of PID 768. Investigating 768 first helps determine the origin and execution chain that led to the suspicious cmd instance.
References (CompTIA CySA+ CS0-003 documents / study guides used):
* Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): parent/child process dependency analysis; process hierarchy monitoring; masquerading techniques
* Mike Chapple & David Seidl, CompTIA CySA+ Study Guide (CS0-003): abnormal OS process behavior; cmd.exe commonly associated with attacks
NEW QUESTION # 196
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