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| Section | Weight | Objectives |
|---|---|---|
| Incident Response Management | 20% | - Incident response lifecycle
|
| Reporting and Communication | 17% | - Security awareness and training
|
| Security Operations | 33% | - Security monitoring concepts and tools
|
| Vulnerability Management | 30% | - Cloud and virtual environment vulnerabilities
|
>> CompTIA CS0-003 Exam Score <<
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NEW QUESTION # 49
An analyst wants to ensure that users only leverage web-based software that has been pre-approved by the organization. Which of the following should be deployed?
Answer: B
Explanation:
The correct answer is B. Allowlisting.
Allowlisting is a technique that allows only pre-approved web-based software to run on a system or network, while blocking all other software. Allowlisting can help prevent unauthorized or malicious software from compromising the security of an organization. Allowlisting can be implemented using various methods, such as application control, browser extensions, firewall rules, or proxy servers12.
The other options are not the best techniques to ensure that users only leverage web-based software that has been pre-approved by the organization. Blocklisting (A) is a technique that blocks specific web-based software from running on a system or network, while allowing all other software. Blocklisting can be ineffective or inefficient, as it requires constant updates and may not catch all malicious software. Graylisting is a technique that temporarily rejects or delays incoming messages from unknown or suspicious sources, until they are verified as legitimate. Graylisting is mainly used for email filtering, not for web-based software control. Webhooks (D) are a technique that allows web-based software to send or receive data from other web-based software in real time, based on certain events or triggers. Webhooks are not related to web-based software control, but rather to web-based software integration.
NEW QUESTION # 50
An employee downloads a freeware program to change the desktop to the classic look of legacy Windows. Shortly after the employee installs the program, a high volume of random DNS queries begin to originate from the system. An investigation on the system reveals the following:
Add-MpPreference - ExclusionPath '%Program Files%\ksyconfig'
Which of the following is possibly occurring?
Answer: C
Explanation:
Defense evasion is the technique of avoiding detection or prevention by security tools or mechanisms. In this case, the freeware program is likely a malware that generates random DNS queries to communicate with a command and control server or exfiltrate data. The command Add- MpPreference -ExclusionPath '%Program Filest\ksysconfig' is used to add an exclusion path to Windows Defender, which is a built-in antivirus software, to prevent it from scanning the malware folder.
NEW QUESTION # 51
Which Of the following techniques would be best to provide the necessary assurance for embedded software that drives centrifugal pumps at a power Plant?
Answer: B
Explanation:
The best technique to provide the necessary assurance for embedded software that drives centrifugal pumps at a power plant is formal methods. Formal methods are a rigorous and mathematical approach to software development and verification, which can ensure the correctness and reliability of critical software systems. Formal methods can be used to specify, design, implement, and verify embedded software using formal languages, logics, and tools.
NEW QUESTION # 52
A security audit for unsecured network services was conducted, and the following output was generated:
Which of the following services should the security team investigate further? (Select two).
Answer: C,E
Explanation:
The output shows the results of a port scan, which is a technique used to identify open ports and services running on a network host. Port scanning can be used by attackers to discover potential vulnerabilities and exploit them, or by defenders to assess the security posture and configuration of their network devices1 The output lists six ports that are open on the target host, along with the service name and version associated with each port. The service name indicates the type of application or protocol that is using the port, while the version indicates the specific release or update of the service. The service name and version can provide useful information for both attackers and defenders, as they can reveal the capabilities, features, and weaknesses of the service.
Among the six ports listed, two are particularly risky and should be investigated further by the security team:
port 23 and port 636.
Port 23 is used by Telnet, which is an old and insecure protocol for remote login and command execution.
Telnet does not encrypt any data transmitted over the network, including usernames and passwords, which makes it vulnerable to eavesdropping, interception, and modification by attackers. Telnet also has many known vulnerabilities that can allow attackers to gain unauthorized access, execute arbitrary commands, or cause denial-of-service attacks on the target host23 Port 636 is used by LDAP over SSL/TLS (LDAPS), which is a protocol for accessing and modifying directory services over a secure connection. LDAPS encrypts the data exchanged between the client and the server using SSL/TLS certificates, which provide authentication, confidentiality, and integrity. However, LDAPS can also be vulnerable to attacks if the certificates are not properly configured, verified, or updated. For example, attackers can use self-signed or expired certificates to perform man-in-the-middle attacks, spoofing attacks, or certificate revocation attacks on LDAPS connections.
Therefore, the security team should investigate further why port 23 and port 636 are open on the target host, and what services are running on them. The security team should also consider disabling or replacing these services with more secure alternatives, such as SSH for port 23 and StartTLS for port 6362
NEW QUESTION # 53
After a risk assessment, a server was found hosting a vulnerable legacy system that has the following characteristics:
* There is no patch or official fix available from the vendor.
* There is no official support provided by the vendor.
* Customers consider the system mission critical.
Which of the following actions will best decrease the risk posed by the legacy system?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Because the system is mission critical and there is no patch and no vendor support, the best risk-reduction approach is to implement compensating controls. Compensating controls are specifically recommended when immediate remediation is not possible, and for legacy systems where patches may not exist.
The Sybex CySA+ Study Guide states this directly:
Exact extract (Sybex Study Guide): "Legacy systems may not have patches available, meaning that compensating controls may be the only option available." Secbay Press also explains that legacy systems may lack vendor support/updates and that mitigation strategies like compensating controls or isolation are essential to reduce risk:
Exact extract (Secbay Press): "Legacy systems may lack vendor support and updates, making mitigation strategies essential... Implement specific mitigation strategies for legacy systems, such as compensating controls or isolation." And Secbay provides a legacy-system compensating control case study showing exactly the kinds of controls mentioned in option D-segmentation/isolation, access controls, and enhanced monitoring/continuous monitoring:
Exact extract (Secbay Press): "Selected compensating controls, such as network segmentation, intrusion detection systems, and enhanced monitoring, to mitigate the risks..." Why the other options are not "best" given the constraints:
A (Decommission immediately): may be ideal long-term, but conflicts with "mission critical" (and "immediately" is often unrealistic for business operations).
B (Block inbound/allow outbound): helps somewhat but is incomplete and can still allow command-and-control or exfiltration outbound; also doesn't address restricted admin access/monitoring comprehensively.
C (WAF): useful only if this is specifically a web application exposure; the scenario says "legacy system" broadly. Compensating controls are the most complete and universally applicable choice.
Reference (CompTIA CySA+ CS0-003 documents / study guides used):
Chapple/Seidl, CompTIA CySA+ Study Guide (CS0-003): legacy systems may have no patches; compensating controls may be the only option Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): legacy systems lack support/updates; use compensating controls or isolation
NEW QUESTION # 54
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