Why do we need buffer overflow?
A buffer overflow (or buffer overrun) occurs when the volume of data exceeds the storage capacity of the memory buffer. If the transaction overwrites executable code, it can cause the program to behave unpredictably and generate incorrect results, memory access errors, or crashes.
What is ROP in buffer overflow?
And today we are going to be continuing our ongoing series on exploit techniques for buffer overflows and the mitigations that help protect you against them. So ROP stands for Return Oriented Programming and this is a concept that was originally part of Linux exploitation in a technique known as return to libc.
Does Aslr prevent ROP?
One of the many techniques developed to prevent ROP attacks is address space layout randomization (ASLR), a process implemented in almost all operating systems. Microsoft and Intel recently joined forces to strengthen hardware protection against the widespread use of ROP.
What is a heap spray attempt?
In the context of computer security, a heap spray is an old technique that allows vulnerable systems to be taken advantaged of easily. This happens when threat actors write to the heap—a predetermined location in the computer’s memory—for a running program. This task of writing is often referred as “spraying the heap”.
What is the purpose of ROP?
The goal of ROP surgery is to stop the progression of the disease and prevent blindness. ROP surgery has a good success rate, but not all babies respond to treatment. Up to 25% of babies who have ROP surgery might still lose some or all vision.
Why is buffer overflow still a problem?
The reason buffer overflows are so prevalent is because the majority of applications are written in C and C++, both of which have no built-in protection against accessing or overwriting data anywhere in memory. They also do not automatically check if data written to a buffer is within the bounds of that buffer.
What is ROP security?
Return-Oriented Programming is a security exploit technique used by attackers to execute code on their target system. By obtaining control of the call stack, the attacker can control the flow of existing trusted software running on the computer and manipulate it to their own ends.
Why are type safe languages not subject to buffer overflow?
A small nit, but type-safety is not a defense against buffer overflows. Buffer overflows are prevented by automatic bounds checking. Type safety only prevents you from using one type where another is expected.
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.