FREE OSCP Buffer Overflow Questions and Answers

Question 1

A _________ is a sequential section of memory that has been set aside for holding data, like a character string or an array of numbers.

Accepted Answer

buffer

Answer

A buffer is a temporary storage area in memory used to hold data while it is being transferred from one location to another. It acts as an intermediate space to manage data flow, often compensating for differences in processing speeds between devices or processes. This definition perfectly describes a sequential section of memory set aside for holding data like strings or arrays.

Question 2

In a ____________ attack, a hacker or penetration tester projects additional data that contains certain particular instructions in the memory for operations in order to compromise the system.

Accepted Answer

Buffer-overflow

Answer

A buffer-overflow attack occurs when a program attempts to write more data into a fixed-size buffer than it can hold. This excess data 'overflows' into adjacent memory locations, potentially overwriting critical data or injecting malicious code. Attackers exploit this vulnerability to execute arbitrary code or alter the program's execution flow, thereby compromising the system.

Question 3

How many different kinds of buffer-overflow attacks exist?

Accepted Answer

2

Answer

There are primarily two main types of buffer-overflow attacks: stack-based buffer overflows and heap-based buffer overflows. Stack-based overflows target data stored on the call stack, while heap-based overflows exploit vulnerabilities in data allocated on the heap memory. Both types can lead to severe security vulnerabilities if exploited successfully.

Question 4

Let's say a search field in an application can only hold 200 words; if you type in more and click the search button, the system would crash. Usually, this results from _____.

Accepted Answer

Buffer

Answer

The scenario described, where typing too much into a search field causes a system crash, is a classic symptom of a buffer overflow. The application likely allocates a fixed-size buffer to store the input, and exceeding this limit causes data to spill into adjacent memory. This corruption of memory can lead to unexpected program behavior or a system crash, indicating a lack of proper input validation or boundary checks.

Question 5

There is a common code error in apps called _____________ that might be used by an attacker to access your system or cause it to malfunction.

Accepted Answer

Buffer-overrun

Answer

Buffer-overrun is another term used interchangeably with buffer-overflow. It describes the condition where a program writes data beyond the allocated boundary of a fixed-size buffer. This common programming error can be exploited by attackers to inject malicious code, corrupt data, or cause the application to crash, leading to system compromise.

OSCP - Offensive Security Certified Professional Practice Test

OSCP - Offensive Security Certified Professional Practice Test

FREE OSCP Buffer Overflow Questions and Answers