![]() When the application attempts to copy the data over (assuming that the same overflow does not happen there as well), it will overwrite a large amount of other memory and likely cause a segmentation fault. If an attacker provides an input equal to the maximum value of an unsigned int plus one, then the allocated memory will have length zero. However, an integer overflow or underflow vulnerability could result in a misallocation of memory.įor example, assume that an application uses an unsigned integer for this length value. An application may:Īs long as the length value for the user-provided data is correct, then this process works well. The potential for a buffer overflow vulnerability caused by an integer overflow or underflow vulnerability exists due to a common coding pattern for managing user input. In these cases, it is possible that memory used elsewhere in the application could be overwritten. Creating buffer overflowsīuffer overflow vulnerabilities are most commonly caused when a program tries to write more data to a memory address than was allocated for that chunk of memory. This could result in a buffer overflow vulnerability or the use of an unacceptable value for an operation. In these situations, an integer overflow or underflow vulnerability could allow an attacker to bypass the value check. For example, when making a withdrawal from an account, there is likely an account balance variable that is checked to ensure that the value of the withdrawal is less than or equal to the value stored in the account. ![]() Integers are commonly used to store the size of an array or specify the range of acceptable values for an operation. ![]() In many cases, this essential operation will be a value check. Breaking value checks through vulnerability exploitationĮxploiting an integer overflow or underflow vulnerability requires identifying a place in the code where the value stored in the vulnerable variable is essential to the program’s operation.
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