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質問 # 283
A security analyst is reviewing the findings of the latest vulnerability report for a company ' s web application. The web application accepts files for a Bash script to be processed if the files match a given hash.
The analyst is able to submit files to the system due to a hash collision. Which of the following should the analyst suggest to mitigate the vulnerability with the fewest changes to the current script and infrastructure?
正解：B
解説：
The correct answer is B. Replace the current MD5 with SHA-256.
The vulnerability that the security analyst is able to exploit is a hash collision, which is a situation where two different files produce the same hash value. Hash collisions can allow an attacker to bypass the integrity or authentication checks that rely on hash values, and submit malicious files to the system. The web application uses MD5, which is a hashing algorithm that is known to be vulnerable to hash collisions. Therefore, the analyst should suggest replacing the current MD5 with SHA-256, which is a more secure and collision- resistant hashing algorithm.
The other options are not the best suggestions to mitigate the vulnerability with the fewest changes to the current script and infrastructure. Deploying a WAF (web application firewall) to the front of the application (A) may help protect the web application from some common attacks, but it may not prevent hash collisions or detect malicious files. Deploying an antivirus application on the hosting system may help scan and remove malicious files from the system, but it may not prevent hash collisions or block malicious files from being submitted. Replacing the MD5 with digital signatures (D)may help verify the authenticity and integrity of the files, but it may require significant changes to the current script and infrastructure, as digital signatures involve public-key cryptography and certificate authorities.
質問 # 284
An analyst is reviewing system logs while threat hunting:
Which of the following hosts should be investigated first?
正解：B
解説：
From the logs, PC3 showsoutlook.exe spawning excel.exe at 1:15 PM, and laterexcel.exe spawning procdump.
exe at 1:16 PM. This is highly suspicious becauseoutlook.exe should not normally launch Excel, andprocdump.exe is often used by attackers to dump process memory, which is a common technique in credential theft.
* PC1:Running expected Windows processes (wininit.exe spawning services.exe and lsass.exe).
* PC2:Running a browser process (chrome.exe) from explorer.exe, which is normal.
* PC3:Highly suspicious behavior (Excel spawning procdump.exe).
* PC4:Running mstsc.exe (Remote Desktop) from explorer.exe, which is expected.
* PC5:Running Firefox from explorer.exe, which is normal.
Thus,PC3 should be prioritized for investigationdue to its potential involvement in credential theft.
質問 # 285
An analyst investigated a website and produced the following:
Starting Nmap 7.92 ( https://nmap.org ) at 2022-07-21 10:21 CDT
Nmap scan report for insecure.org (45.33.49.119)
Host is up (0.054s latency).
rDNS record for 45.33.49.119: ack.nmap.org
Not shown: 95 filtered tcp ports (no-response)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.4 (protocol 2.0)
25/tcp closed smtp
80/tcp open http Apache httpd 2.4.6
113/tcp closed ident
443/tcp open ssl/http Apache httpd 2.4.6
Service Info: Host: issues.nmap.org
Service detection performed. Please report any incorrect results at https://nmap .org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 20.52 seconds
Which of the following syntaxes did the analyst use to discover the application versions on this vulnerable website?
正解：A
質問 # 286
A security team is concerned about recent Layer 4 DDoS attacks against the company website. Which of the following controls would best mitigate the attacks?
正解：A
解説：
Rolling out a CDN is the best control to mitigate the Layer 4 DDoS attacks against the company website. A CDN is a Content Delivery Network, which is a system of distributed servers that deliver web content to users based on their geographic location, the origin of the web page, and the content delivery server. A CDN can help protect against Layer 4 DDoS attacks, which are volumetric attacks that aim to exhaust the network bandwidth or resources of the target website by sending a large amount of traffic, such as SYN floods, UDP floods, or ICMP floods. A CDN can mitigate these attacks by distributing the traffic across multiple servers, caching the web content closer to the users, filtering out malicious or unwanted traffic, and providing scalability and redundancy for the website12. References: How to Stop a DDoS Attack: Mitigation Steps for Each OSI Layer, Application layer DDoS attack | Cloudflare
質問 # 287
An incident response analyst notices multiple emails traversing the network that target only the administrators of the company. The email contains a concealed URL that leads to an unknown website in another country. Which of the following best describes what is happening? (Choose two.)
正解：D、E
解説：
A social engineering attack is a type of cyberattack that relies on manipulating human psychology rather than exploiting technical vulnerabilities. A social engineering attack may involve deceiving, persuading, or coercing users into performing actions that benefit the attacker, such as clicking on malicious links, divulging sensitive information, or granting access to restricted resources. An obfuscated link is a link that has been disguised or altered to hide its true destination or purpose. Obfuscated links are often used by attackers to trick users into visiting malicious websites or downloading malware. In this case, an incident response analyst notices multiple emails traversing the network that target only the administrators of the company. The email contains a concealed URL that leads to an unknown website in another country. This indicates that the analyst is witnessing a social engineering attack using obfuscated links.
質問 # 288
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