DulRu

Basic Requirements for exploits   In here shows you how to identify a buffer overflow vulnerability and how to develop a buffer overflow exploit using Python and Ruby scripts within a Kali Linux attack VM.   Also use olly-dbg for debugging of the vulnserver executable. The victim VM will be a,   Windows 7 Professional 32-bit VM with vulnserver installed. Vulnserver is a windows-based multi-threaded TCP server that is intentionally vulnerable to buffer overflow. we're going to be exploiting the TRUN command in Vulnserver in order to a reverse shell with netcat.   In “Windows 7 Professional 32-bit VM” please make sure that the Windows Firewall is turned off and that your attack and victim VMs are able to ping one another. >>  GitHub Link >>   YouTube Link  

First you will need nasm installed on your machine to compile it. sudo apt-get install nasm Write the below assembly code in an editor and save as shell.asm To   compile it use the following commands $nasm -f elf -o shell.o shell.asm and $ld -o shell shell.o To address this issue we can use the following commands $nasm -f elf64 -o shell.o shell.asm and $ld -m elf_x86_64 -s -o shell shell.o Now run it with:  ./shell

Phase 1 Give execute permission to the file  sheldon1  and then  we test our inputs using debugger.  Using GDB debugger we can open  sheldon1. We need to check the available function. Then we can check the main function. When the program runs we can enter the pass phrase and grant access to the next phase. The program calls the relevant phase function upon the correct phase phrase. Then check the phase_1 function. We have a fixed address pushed to the memory and then we got a TEST instruction. $0x80497c0 In that memory address we can print out the first 30 characters. Then we can use gdb to run the program to get the string and therefore we can test this is the right phrase. key =>> Public speaking is very easy. >> GitHub Link