Questions and answers

Is stack overflow the same as buffer overflow?

Is stack overflow the same as buffer overflow?

A stackoverflow is when the size of the stack for a thread exceeds the maximum allowable stack size for that thread. A buffer overflow is when a value is written into memory that is not currently allocated by the program.

What is meant by buffer overflow?

A buffer overflow, or buffer overrun, occurs when more data is put into a fixed-length buffer than the buffer can handle. This overflow usually results in a system crash, but it also creates the opportunity for an attacker to run arbitrary code or manipulate the coding errors to prompt malicious actions.

What is buffer overflow with example?

Attackers exploit buffer overflow issues by overwriting the memory of an application. For example, an attacker can overwrite a pointer (an object that points to another area in memory) and point it to an exploit payload, to gain control over the program. …

What is a buffer overflow example?

What is Buffer Overflow. For example, a buffer for log-in credentials may be designed to expect username and password inputs of 8 bytes, so if a transaction involves an input of 10 bytes (that is, 2 bytes more than expected), the program may write the excess data past the buffer boundary.

What can a buffer overflow result in?

Buffer overflows can affect all types of software. They typically result from malformed inputs or failure to allocate enough space for the buffer. If the transaction overwrites executable code, it can cause the program to behave unpredictably and generate incorrect results, memory access errors, or crashes.

Can Python have buffer overflow?

Buffer overflow vulnerabilities exist in programming languages which, like C, trade security for efficiency and do not check memory access. In higher-level programming languages (e.g. Python, Java, PHP, JavaScript or Perl), which are often used to build web applications, buffer overflow vulnerabilities cannot exist.

What are some common buffer overflow attacks?

Stack overflow attack – This is the most common type of buffer overflow attack and involves buffer overflow in the call stack. Heap overflow attack – This type of attack targets data in the open memory pool known as the heap.

What do you mean by buffer overflow in programming?

Buffer overflow. In information security and programming, a buffer overflow, or buffer overrun, is an anomaly where a program, while writing data to a buffer, overruns the buffer’s boundary and overwrites adjacent memory locations. Buffers are areas of memory set aside to hold data, often while moving it from one section…

What are the risks of a buffer overrun?

A buffer overrun is one of the most common sources of security risk. A buffer overrun is essentially caused by treating unchecked, external input as trustworthy data. The act of copying this data, using operations such as CopyMemory, strcat, strcpy, or wcscpy, can create unanticipated results, which allows for system corruption.

When to use overrun or stack overflow in Java?

We could define overrun, when you have multiple adjacent buffers after each other, and you index into the second (e.g read the 6th element of the first 3-element array but you get the 3rd element of the second 3-element array). Stack overflow is kinda buffer overflow when you fill your entire stack ‘memory buffer’.

What happens when an application overwrites the buffer?

Buffer overflow is also known as Buffer overrun, is a state of the computer where an application tries to store more data in the buffer memory than the size of the memory. This leads to data being stored into adjacent storage, which may sometimes overwrite the existing data, causing potential data loss and sometimes a system crash as well.