Difference between - buffer overflow and return to libc attack
2011年9月5日 · In the classic buffer overflow exploit, the stack buffer being overflowed was filled with both the machine code to be executed (called the shellcode, because it typically invoked a shell process) and the new return address. The new return address would be crafted to point back within the overflowed stack buffer itself.
buffer overflow attack works when compiled using clang but not …
2024年2月11日 · The above is an example code for performing buffer overflow attack, it works when compiled using clang , but not when compiled using gcc. I think the problem is than of array alignment. On using the compile flag -mpreferred-stack-boundary=2 the program do works in gcc. But is there another solution without using -mpreferred-stack-boundary=2 ?
How to perform a simple buffer_overflow attack?
2019年8月20日 · When I start the program and feed it a lot of A's, I examine the buffer and see it is that I can overwrite the RIP and make it point to an address close to the beginning of the buffer, so that the control jumps to the NOP-sled and then slides down to the shellcode. Here is output of examining the buffer in GDB.
c - How does a NOP sled work? - Stack Overflow
2018年4月6日 · I can't find a good source that answers this question. I know that a nop sled is a technique used to circumvent stack randomization in a buffer overflow attack, but I can't get my head around how it works. What's a simple example that illustrates this method? What do terms like 128-byte nop sled mean?
c - Return to libc buffer overflow attack - Stack Overflow
2021年5月16日 · I tried to make a return to libc buffer overflow. I found all the addresses for system, exit and /bin/sh, I don't know why, but when I try to run the vulnerable program nothing happens. system, exit
A buffer overflow attack on Windows results in access violation
2011年4月11日 · I just started looking into how buffer overflow attacks work, and tried simulating an attack on Windows 7 using Visual C 2010. The buffer overflow attack is very contrived, it just overwrites the return address to the address of the "buffer" local variable. The buffer holds the string of shellcode.
c - sprintf function's buffer overflow? - Stack Overflow
2014年9月12日 · Thereby the attacker mounted a buffer overflow attack. He might use something like the NOP sled technique to have your application start a shell for him. If you were writing an application that ran under a privileged user account, you'd just have provided an attacker with a first-grade entry to your costumer's system, an ACE hole, if you will.
Is PHP buffer overflow possible? - Stack Overflow
2012年8月5日 · A buffer overflow attack seeks to overflow the memory allocation buffer inside your PHP application or, more seriously, in Apache or the underlying operating system. Remember that you may be using a high-level language like PHP to code your Web applications, but at the end of the day, you're calling C (in the case of Apache) to do work.
gcc memory allocation issue - buffer overflow attack
2013年3月19日 · You cannot prevent an attack or a buffer overflow without bounds checking, which isn't always possible. You can only sometimes detect an overflow after the fact. At best the compiler can include extra information (a so called canary value ) near the return address on the stack and before returning from the function check that it's intact and ...
How to get root access by buffer overflow attack?
2020年11月13日 · How to do buffer overflow attack on this to get root access. I tried finding an address but not got many leads in this. I disabled ASLR and also used no stack pointer at the time of compilation. when I enter more than 16 bytes it gave me segmentation fault in gdb: