alpine 3.6
access weakness #437


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.

 		st.st_mode = 0666;  fixup_mode = TRUE;
			struct stat dir_st;

			st.st_uid = getuid ();

			if (g_stat (dirname, &dir_st) == 0 &&
			    S_ISDIR (dir_st.st_mode) &&
			    (dir_st.st_mode & S_ISGID))
				st.st_gid = dir_st.st_gid;
				st.st_gid = getgid ();

	/* Save to a temporary file.  We set the umask because some (buggy)
	 * implementations of mkstemp() use permissions 0666 and we want 0600.
	temp_filename = g_build_filename (dirname, ".gsf-save-XXXXXX", NULL);
	/* Oh, joy.  What about threads?  --MW */
	saved_umask = umask (0077);
	fd = g_mkstemp (temp_filename); /* this modifies temp_filename to the used name */
	umask (saved_umask);

	if (fixup_mode)
		st.st_mode &= ~saved_umask;

	if (fd < 0 || NULL == (file = fdopen (fd, "wb"))) {
		if (err != NULL) {
			int save_errno = errno;
			char *dname = g_filename_display_name
			*err = g_error_new
				(gsf_output_error_id (), errno,
				 "%s: %s",
				 dname, g_strerror (save_errno));
			g_free (dname);
		goto failure;

	stdio = (GsfOutputStdio *)g_object_new_valist (GSF_OUTPUT_STDIO_TYPE,
		first_property_name, var_args);
	stdio->file = file;
	stdio->st = st;
	stdio->create_backup_copy = FALSE;
	stdio->real_filename = real_filename;
	stdio->temp_filename = temp_filename; 

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