What you’ll learn
- Buffer Overflow basics
- Win32 Assembly
- Exploiting Buffer Overflow
- Learn more about exploitation
This course includes:
- 33 mins on-demand video
- Full lifetime access
- Access on mobile and TV
- Certificate of completion
Description
What is a buffer overflow
A buffer is a storage area that holds data temporarily while it is being transferred from one place to another. A buffer overflow (or buffer overflow) occurs when the amount of data exceeds the storage capacity of the memory buffer. As a result, programs that try to write data into the buffer will overwrite adjacent memory locations.
For example, a credential buffer could be designed to expect 8 bytes of username and password input, so if a transaction has 10 bytes of input (which is 2 bytes more than expected), the program writes excess data after the limit of the buffer can.
Buffer overflows can affect all types of software. This is usually the result of incorrect input or failure to allocate sufficient space for the buffer. If a transaction overwrites the executable code, it can cause the program to behave unexpectedly, produce incorrect results, memory access errors, or crash.
Attackers exploit the buffer overflow problem by overwriting application memory. This changes the program’s execution path and triggers responses that destroy files or reveal private information. For example, an attacker can enter additional code and send new instructions to an application to gain access to IT systems.
If an attacker knows the memory layout of a program, they can insert information that the buffer cannot store and overwrite the area with executable code and replace it with their own code. For example, an attacker could override pointers (objects that point to other areas of memory) and reference the payload to take control of the program.
The difficulty is that most IT professionals do not have the necessary general background in software development to deal with buffer overflows. This course covers the technical issues of managing computer memory, controlling code and data in running programs, and deploying poor quality software in terms that an IT person with no software development skills can understand.
In this course, you will learn the basics of Buffer Overflow and also gain insight into how to use systems that use Buffer Overflow. See you inside!
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