What does Buffer Overflow mean ?>>>>>>>>>>>>>>>>>>>>>>>>>>
A so-called Buffer Overflow or stack overflow is an error in the programming.
This programming error may cause the buffer of a computer to overflow with data. Specifically, this means that data is not stored in the intended buffer, but also overwrites memory locations that are not intended to store this data at all, which in most cases leads to a program crash. Hackers often exploit this vulnerability to gain control over the affected system or to install malware.
How does a Buffer Overflow occur ?
In every computer program, variables are stored locally in a segment during program runtime. When the program starts, three different segments are created, namely:
- a code segment
- a data segment (heap)
- A stack segment
In this context, the stack segment plays a particularly important role, since this segment is used as temporary storage when programs are executed, and is located at the upper end of the address space. If older data segments are to be retrieved, the stack must first be emptied. At this moment, a stack overflow may occur. Namely, it can happen that a program fills a variable with data that is larger than the available memory space within the variable. The result is a Buffer Overflow, which in most cases leads to a program crash.
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