Which situation is most likely to lead to a buffer overflow?

A user pastes a very long message into a field that expects only a few characters.

A user turns on two-factor authentication.

A user visits a website over HTTPS.

A user changes their password every 90 days.

A buffer overflow can be dangerous because overflowing data may...

Overwrite nearby memory and affect how the program runs.

Automatically update the operating system.

Create a new firewall rule to block the user.

Encrypt all files to protect confidentiality.

Which is an example of input that could overflow a buffer?

Entering 500 characters into a field designed for 50 characters.

Entering a correct password on the first attempt.

Clicking a link that opens a new tab.

A developer expects a whole number for "items to order." Which action reduces buffer overflow risk?

Limit input length and reject input that does not match the expected size and type.

Allow any length input and store it in a tiny buffer.

Convert the input to audio before storing it.

Disable the keyboard so users cannot type.

What is the BEST definition of "user input buffer" in this topic?

Memory reserved to hold what the user types before the program uses it.

A list of trusted websites a browser can visit.

A device that filters web traffic by IP address.

A cryptographic key used to encrypt user input.

A program is designed for short commands like START, STOP, and HELP. Why should the buffer size be planned?

Because the program should reserve memory based on the expected input length.

Because buffers are only needed for video files.

Because larger buffers always cause attacks.

Because buffer size determines the Wi-Fi channel.

If an attacker tries to exploit a buffer overflow, what might they do first?

Send input that is much larger than the program expects.

Turn off runtime checks in the router.

Change the user's MAC address to a private IP.

Disable the organization's VPN policy.

Which choice correctly connects buffers to expected input?

Buffers are sized based on the type and amount of input expected by the program.

Buffers are always 1 byte and never change.

Buffers are physical locks used in server rooms.

Buffers are the same as encryption keyspaces.

When runtime checks for buffer overflows are enabled, what is added around the user input buffer?

Extra memory segments before and after the buffer that are checked for changes.

A second password field that must be typed twice.

A firewall that blocks all outbound traffic.

A VPN tunnel that hides the device IP address.

What does it mean if the extra memory segments around a buffer have changed?

The buffer was overflowed, so the program should terminate.

The user typed the correct password.

The file was encrypted successfully.

The network is using a secure Wi-Fi standard.

Why do runtime checks help protect applications from buffer overflows?

They detect overflow by checking whether the extra memory areas were altered and stop the program.

They automatically increase internet speed.

They replace the need for authentication.

They prevent users from entering any data.

A developer enables runtime checks. During a test, the program stops right after a long input is entered. What is the most likely reason?

The runtime check detected that the buffer overflowed and terminated the program.

The firewall blocked the keyboard.

The operating system deleted the buffer on purpose.

The user's account was locked out for MFA.

In plain language, runtime checks are looking for which sign?

A change in the "guard" memory placed before/after the input buffer.

A change in the Wi-Fi SSID name.

A change in the CPU clock speed.

A change in the password hash algorithm.

Which option best describes what happens after a runtime check detects an overflow?

The program terminates to prevent the overflow from causing more harm.

The program keeps running but ignores the user input.

The program automatically grants admin privileges.

The program sends the input to the internet for analysis.

A security team says, "Our application uses guard regions to detect overflows." Which concept are they describing?

Extra memory segments added before and after the buffer that are checked during runtime.

Encrypting data at rest with AES.

Which statement is TRUE about runtime checks for buffer overflows?

They check memory around the buffer to see if it was overwritten.

They guarantee no one can ever input too much data.

They only work on network traffic, not memory.

They are the same thing as full disk encryption.

A student says, "Runtime checks add extra memory sectors around the buffer." Why is that helpful?

It provides a way to detect when input spills outside the buffer's boundaries.

It makes the buffer smaller so it can't overflow.

It hides the buffer from the operating system.

It changes the IP address of the application server.

Which scenario best shows effective runtime checking?

A program detects changed guard memory after a long input and immediately terminates.

A program ignores guard memory and keeps running after overflow.

A program removes all password requirements.

A program disables logging to improve performance.

What is the main goal of terminating the program after an overflow is detected?

To stop the application before overwritten memory can be used for unauthorized actions.

To save the user's input for later.

To increase the number of allowed login attempts.

To avoid using encryption keys that are too long.

Which is the BEST description of the "extra memory" used in runtime checks?

A protective area checked for changes to reveal an overflow.

A backup copy of the hard drive.

A second network card for redundancy.

If runtime checks are OFF, which outcome is more likely after a buffer overflow?

The overflow may go unnoticed and overwrite memory without immediately stopping the program.

The overflow is always automatically encrypted.

The operating system forces the user to reset their password.

The firewall blocks the application's login page.

A programmer wants to know whether a buffer overflow happened during program execution. What should they enable?

Runtime checks that verify the extra memory segments around the buffer.

Which statement best matches the idea in 5.5.D.2?

If the guard memory changes, the program concludes the buffer overflowed and terminates.

If the user enters a long password, the program must store it in plaintext.

If a firewall blocks a port, the buffer is safe.

If a user uses MFA, buffer overflows cannot happen.

Computer Science - Buffer Overflows & Runtime Checks Worksheet

Authored by Sini Thomas

Computers

University

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Computer Science - Buffer Overflows & Runtime Checks Worksheet

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30 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A program asks a user to type a 20-character username. What is the main purpose of the buffer the program reserves?

To hold the user's input in a reserved section of memory while the program processes it.

To permanently store the username on the hard drive.

To encrypt the username before it is displayed.

To block all network traffic while the user types.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a buffer overflow, what usually causes the problem?

The user enters more data than the buffer was designed to hold.

The user enters data too slowly.

The buffer stores data on the CPU instead of RAM.

The program uses too many passwords.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A developer expects a 4-digit PIN. Which design choice best matches 5.5.D.1?

Reserve a buffer sized for the expected PIN input before accepting user data.

Reserve no memory and write each digit directly to disk.

Accept unlimited input and ignore extra characters.

Store the PIN only in the network card.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement best describes a buffer in an application?

A designated section of memory reserved to temporarily store data like user input.

A password policy that limits login attempts.

A firewall rule that blocks unsafe ports.

A type of encryption key used for HTTPS.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A program expects an email address, but it allocates a buffer sized for only 10 characters. What risk does this create?

A higher chance that user input exceeds the buffer and overflows it.

A guarantee that the email address will be encrypted.

A reduction in the amount of RAM the computer has.

A guarantee that the program will run faster and safer.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the program choose the number of memory segments in a buffer?

It is based on the type and amount of input the program expects.

It is always the same number for every program.

It is chosen by the user at login.

It is determined by the network router.

Tags

5.5.D

5.5.D.1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A text box should accept up to 200 characters. Which buffer design is safest?

Allocate a buffer that matches the expected maximum input (or safely enforces that limit).

Allocate a 10-character buffer and allow any input length.

Allocate a buffer only after the program prints the result.

Allocate no buffer and copy characters into random memory.

Tags

5.5.D

5.5.D.1

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