alpine 3.6
access weakness #363


Weakness Breakdown


An access weakness occurs when software does not properly implement permissions that could have unintended consequences if exploited by malicious actors. An example of this weakness is when a default username and password are set by the developer but do not get changed by the system administrator.

Warning code(s):

Ensure that umask is given most restrictive possible setting.

File Name:



The highlighted line of code below is the trigger point of this particular Alpine 3.6 access weakness.

     } else if (*p == '\\') {
      *p = '/';

/// Name of Vim's own temp dir. Ends in a slash.
static char_u *vim_tempdir = NULL;

/// Create a directory for private use by this instance of Neovim.
/// This is done once, and the same directory is used for all temp files.
/// This method avoids security problems because of symlink attacks et al.
/// It's also a bit faster, because we only need to check for an existing
/// file when creating the directory and not for each temp file.
static void vim_maketempdir(void)
  static const char *temp_dirs[] = TEMP_DIR_NAMES;
  // Try the entries in 'TEMP_DIR_NAMES' to create the temp directory.
  char_u template[TEMP_FILE_PATH_MAXLEN];
  char_u path[TEMP_FILE_PATH_MAXLEN];

  // Make sure the umask doesn't remove the executable bit.
  // "repl" has been reported to use "0177".
  mode_t umask_save = umask(0077);
  for (size_t i = 0; i < ARRAY_SIZE(temp_dirs); i++) {
    // Expand environment variables, leave room for "/nvimXXXXXX/999999999"
    expand_env((char_u *)temp_dirs[i], template, TEMP_FILE_PATH_MAXLEN - 22);
    if (!os_isdir(template)) {  // directory doesn't exist

    add_pathsep((char *)template);
    // Concatenate with temporary directory name pattern
    STRCAT(template, "nvimXXXXXX");

    if (os_mkdtemp((const char *)template, (char *)path) != 0) {

    if (vim_settempdir((char *)path)) {
      // Successfully created and set temporary directory so stop trying.
    } else {
      // Couldn't set 'vim_tempdir' to 'path' so remove created directory.
      os_rmdir((char *)path);

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