We begin by looking at the protections of the binary. We have several problems and we can not execute code in the stack due to NX protection and we do not see the possibility of an overflow due to canary. We also have PIE activated and full relro so GOT dereferencing/overwriting will not be possible. We start with option 3 that will call the print_flag function. If we see inside the function we ..
We will start by looking at the protections of the binary and we realize that NX is enabled so it will not let us execute code in memory. First we see that our attack vector are two inputs but we do not know the iteration that the program returns to us. So we will have to open gdb and analyze the code in search of how to exploit it and perform the important task of reverse engineering. After see..
At first we realize that there is a format string vulnerability by which we can leak the memory addresses of the stack and thus bypassing ASLR. After a few attempts we see that in position %10$p we leak memory address of the stack and at minus 0x20 it would be the pointer of name whose test content we entered was "AAAA". The next step is to create our exploit that makes the leak using pwntools l..
This is the first tutorial of exercises solutions of Ricardo narvaja spanish course (ignore Google dangerous message). Binary is named Vulnerable_No_vulnerable.exe in 21 lesson. When we run the binary it asks us to introduce an input we also view a string so we already have a starting point to see the references to that string in the .text section. We see the first comparison where it is checked..
Introduction The Modbus Serial Driver creates a listener on Port 27700 / TCP. When a connection is made, the Modbus Application Header is first read into a buffer. If a large buffer size is specified in this header, a stack-based buffer overflow results.The final idea of this article is to reproduce and detail the process by which the vulnerability can be detected and exploited, including why ..
Writeup - From Format String to Buffer OverflowPKTeam Recon First of all we see the protections of the binary. We have several problems. We can not execute code in the stack such as a shellcode due to NX, we can not overflow without having a canary leak and if we want to attach with gdb we have to bypass PIE as if we want to do ROP (Return-Oriented Programming). We also need leak of a function t..
Write-up - Use After FreePKTeam 1. Register. We start registering a user AAAA. 0x555555554ac3 lea rax, [rbp-0x60] 0x555555554ac7 lea rsi, [rip+0x695] # 0x555555555163 0x555555554ace mov rdi, rax 0x555555554ad1 call 0x5555555548b0 We see a comparison of our input in RAX register. This register contains a memory address of the stack that contains the AAAA input. In RSI register we have the string ..
Introduction T he description of the vulnerability reads as follows: The server in Flexense SysGauge 3.6.18 operating on port 9221 can be exploited remotely with the attacker gaining system-level access to a Buffer Overflow.The final idea of this article is to reproduce and detail the process by which the vulnerability can be detected and exploited, including why it occurs. To study the vulner..
- Total
- Today
- Yesterday
- hijacking redirection flow
- buffer overflow
- x64dbg
- GOT Dereferencing/Overwriting
- arithmetic overflow/underflow
- leak libc
- canary
- write primitive
- leak stack memory address
- dnspy
- fake stack frame
- stack pivot
- Backdoors
- pwnable.xyz
- Call oriented programming
- format string
- theFaunia course
- one gadget
- use after free
- shellcode
- open-redirect
- XSS
- ASM
- html injection
- pwnable.tw
- 32Bit
- cracking
- Windows
- Pwnable.kr
- return oriented programming
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