alpine 3.6
access weakness #447


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.

                set_security_context = true;
          else if (optarg)
              error (0, 0,
                     _("warning: ignoring --context; "
                       "it requires an SELinux/SMACK-enabled kernel"));
          usage (EXIT_FAILURE);

  newmode = MODE_RW_UGO;
  if (specified_mode)
      mode_t umask_value;
      struct mode_change *change = mode_compile (specified_mode);
      if (!change)
        die (EXIT_FAILURE, 0, _("invalid mode"));
      umask_value = umask (0);
      umask (umask_value);
      newmode = mode_adjust (newmode, false, umask_value, change, NULL);
      free (change);
      if (newmode & ~S_IRWXUGO)
        die (EXIT_FAILURE, 0,
             _("mode must specify only file permission bits"));

  /* If the number of arguments is 0 or 1,
     or (if it's 2 or more and the second one starts with 'p'), then there
     must be exactly two operands.  Otherwise, there must be four.  */
  expected_operands = (argc <= optind
                       || (optind + 1 < argc && argv[optind + 1][0] == 'p')
                       ? 2 : 4);

  if (argc - optind < expected_operands)
      if (argc <= optind)
        error (0, 0, _("missing operand"));
        error (0, 0, _("missing operand after %s"), quote (argv[argc - 1]));
      if (expected_operands == 4 && argc - optind == 2)
        fprintf (stderr, "%s\n",
                 _("Special files require major and minor device numbers."));
      usage (EXIT_FAILURE); 

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