CPENT Practice Test 5 — 10 Questions

Question 1

An attacker has intercepted ARP traffic on a switched local network and wants to maintain a man-in-the-middle position without causing high volumes of repetitive ARP reply frames that might trigger security alerts. Which tool allows selective, low-frequency ARP poisoning?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Bettercap. Bettercap is a modular network attack framework that includes an ARP spoofing module capable of selective, low-frequency poisoning. Unlike tools that flood the network with ARP replies, Bettercap allows the attacker to target specific hosts and control the rate of spoofed frames, maintaining a stealthy man-in-the-middle position. This makes it ideal for environments where repetitive ARP traffic would trigger IDS/IPS alerts.

Answer

FTP

Answer

Ping

Answer

Telnet

Question 2

An engineering team is hardening an Operational Technology (OT) network segment that relies on legacy SCADA protocols lacking native encryption or authentication. Which THREE compensating controls should the penetration tester recommend to mitigate risks associated with these insecure protocols? (Choose THREE)

Accepted Answer

Deploy industrial Intrusion Detection Systems (IDS) tuned for OT protocol anomalies. Option B is correct because an industrial IDS tuned for OT protocol anomalies (e.g., Modbus, DNP3, IEC 61850) provides passive monitoring and detection of malicious or abnormal commands without requiring the legacy protocols to support encryption or authentication. Option C is correct because ISA/IEC 62443 zones and conduits segmentation limits lateral movement and restricts access to SCADA devices, effectively compensating for the lack of native security in the protocols. Option D is correct because industrial firewalls with SCADA-aware Deep Packet Inspection can enforce protocol-level allowlisting and filter malformed or unauthorized function codes (e.g., Modbus write commands) that legacy protocols cannot authenticate. Option A is incorrect because disabling all TCP/UDP ports would break the SCADA network's required communications and is not a viable compensating control. Option E is incorrect because PLCs typically run real-time operating systems that cannot host traditional endpoint antivirus, and such software is not designed for OT environments.

Answer

Disable all TCP and UDP ports on the SCADA network switches

Answer

Install traditional endpoint antivirus software directly on the Programmable Logic Controllers (PLCs)

Question 3

A penetration tester has compromised a Linux server and wants to verify if the kernel is vulnerable to a known local privilege escalation exploit (such as Dirty COW). Which command should the tester run to check the exact Linux kernel version?

Accepted Answer

uname -r. The command uname -r displays the specific kernel release version, which is critical for identifying applicable kernel-level vulnerabilities.

Answer

whoami

Answer

env

Answer

cat /etc/issue

Question 4

A penetration tester is analyzing a Linux system and finds that the binary /bin/ping has the SUID bit set along with root ownership. What is the security implication of this finding?

Accepted Answer

It allows the binary to execute with the privileges of the file owner (root), which can be exploited if the binary has flaws or drops to a shell.. The SUID bit causes /bin/ping to execute with the effective UID of its owner (root) rather than the invoking user, which is why unprivileged users can open raw ICMP sockets. If the binary contains a vulnerability — buffer overflow, command injection, or an unsafe system()/exec() call — or if it can be coerced into spawning a shell, the attacker inherits root privileges, making it a classic local privilege escalation vector.

Answer

It allows remote attackers to execute system calls over ICMP tunneling.

Answer

Any local user can execute commands as root by passing malicious arguments to the SUID binary.

Answer

The system is immune to local privilege escalation because SUID is disabled by SELinux.

Question 5

During a Windows privilege escalation assessment, a tester discovers that the local 'SeImpersonatePrivilege' is enabled on the current service account token. Which exploitation tool class is best suited for abusing this privilege?

Accepted Answer

Potato family exploits (e.g., PrintSpoofer, RoguePotato) that abuse token impersonation via named pipes.. SeImpersonatePrivilege and SeAssignPrimaryTokenPrivilege allow an attacker to impersonate tokens. Tools like Rotten Potato, RoguePotato, or PrintSpoofer leverage this to escalate to NT AUTHORITY\SYSTEM.

Answer

Mimikatz credential dumper via direct LSASS memory injection.

Answer

PowerView domain enumeration modules.

Answer

Windows Subsystem for Linux (WSL) container breakouts.

Question 6

A penetration tester is evaluating an AWS environment and discovers that an IAM role attached to an Amazon EC2 instance has an overly permissive trust policy allowing any user in the account to assume it via the sts:AssumeRole API without external conditions. Which specific remediation step should the cloud administrator apply to fix this risk?

Accepted Answer

Modify the IAM role trust policy to include a Condition block restricting the principal or requiring multi-factor authentication.. The overly permissive trust policy allows any user in the account to assume the role, which is a significant risk. The remediation is to modify the trust policy to include a Condition block that restricts the principal (e.g., specific IAM users or roles) or requires multi-factor authentication. This ensures that only authorized entities can assume the role, following the principle of least privilege.

Answer

Rotate the AWS account root user access keys immediately.

Answer

Attach an explicit Deny policy to the EC2 instance metadata service version 2 configuration.

Answer

Disable the AWS Security Token Service endpoint globally across the AWS organization.

Question 7

You have compromised a dual-homed Linux host that sits between a DMZ and an internal network. From this host you need to reach internal web servers on TCP/8080 that are not routable from your attack machine, and you want to route all your tooling traffic through the pivot using SOCKS. Which approach correctly establishes the pivot?

Accepted Answer

Run ssh -D 1080 user@pivot and configure your tools to use the local SOCKS5 proxy on port 1080.. A dynamic SSH forward with -D creates a SOCKS proxy on the attack machine that tunnels arbitrary TCP connections through the dual-homed host. Because the pivot has an internal interface, those connections reach internal web servers that are otherwise unroutable. Static local forwards reach only one destination, reverse forwards run in the wrong direction, and a proxy option alone does not establish the tunnel.

Answer

Run ssh -L 8080:internal-web:8080 user@pivot and point your tools at localhost:8080.

Answer

Use nmap --proxies socks4://pivot:1080 to route scans through the pivot's SOCKS service.

Answer

Run ssh -R 1080:localhost:1080 user@pivot to create a reverse SOCKS proxy on the pivot host.

Question 8

An OT security analyst is reviewing network traffic on an industrial control system network and identifies DNP3 protocol packets. Which THREE of the following fields or functions are associated with the DNP3 protocol structure and security? (Choose THREE)

Accepted Answer

Application layer function codes specifying operations like Read, Write, Select, and Operate. Option A is correct because DNP3's application layer defines function codes such as Read (1), Write (2), Select (3), Operate (4), and Direct Operate (5), which are used to request data and control outstations in SCADA/ICS environments. Option C is correct because DNP3's data link layer frames include a CRC checksum in each data block (and header) to detect transmission errors, providing integrity at the link layer. Option E is correct because DNP3 Secure Authentication (SAv2/v5, defined in IEEE 1815) adds challenge-response authentication using HMAC to prevent unauthorized command injection, spoofing, and replay attacks. Option B is incorrect because the WPA2 four-way handshake belongs to IEEE 802.11 wireless LAN security, not DNP3, which is a serial/TCP-IP SCADA protocol. Option D is incorrect because HTTP Bearer tokens are used for REST API authentication over HTTP, which is unrelated to the DNP3 protocol structure.

Answer

IEEE 802.11 WPA2 four-way handshake cryptographic parameters

Answer

HTTP Authorization Bearer tokens used for REST API authentication

Question 9

A pentester wants to execute a Shadow Credentials attack (Key Credential Link abuse) against a high-value user account in Active Directory. What permission on the target user object is required to successfully perform this attack?

Accepted Answer

WriteProperty, GenericAll, or GenericWrite over the msDS-KeyCredentialLink attribute / target object. Shadow Credentials abuse requires write access to the target object's msDS-KeyCredentialLink attribute. Permissions such as GenericAll, GenericWrite, or the specific WriteProperty right over that attribute allow an attacker to inject a Key Credential, which can then be used with PKINIT to obtain a TGT for the target account without knowing its password.

Answer

ReadLAPSPassword extended right

Answer

DS-Replication-Get-Changes-All domain right

Answer

SeEnableDelegationPrivilege on the domain controller

Question 10

A penetration tester is assessing an AWS environment where an EC2 instance is associated with an IAM role that trusts an external third-party AWS account in its trust policy, but the external account ID was mistyped or left overly broad (e.g., condition missing external ID or using an insecure principal). What vulnerability does this introduce?

Accepted Answer

The trusted external account can assume the role, and without an ExternalID condition, it is vulnerable to cross-account confusion or unauthorized assumption.. When an IAM role trust policy allows an external AWS account to assume the role without an ExternalID condition, any principal in that account with sts:AssumeRole permissions can assume the role. If the external account ID is mistyped or overly broad, it could allow unintended accounts to assume the role, leading to unauthorized access. The ExternalID is a best practice to prevent the confused deputy problem, especially when third-party vendors are involved.

Answer

The EC2 instance is vulnerable to local root privilege escalation via kernel module injection.

Answer

AWS CloudTrail logs for the instance are permanently deleted.

Answer

The third-party account gains direct SSH access to the EC2 instance filesystem.