alpine 3.6
access weakness #338


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.

 	    switch (n) {
	      case LOCK_ERROR:
		reason = "error";
	      case LOCK_TIMEOUT:
		reason = "timeout";
	    fprintf (stderr, "%s:  %s in locking authority file %s\n",
		     ProgramName, reason, authfilename);
	    return -1;
	} else
	    xauth_locked = True;

    /* these checks can only be done reliably after the file is locked */
    exists = (access (authfilename, F_OK) == 0);
    if (exists && access (authfilename, W_OK) != 0) {
	fprintf (stderr,
	 "%s:  %s not writable, changes will be ignored\n",
		 ProgramName, authfilename);
	xauth_allowed = False;

    original_umask = umask (0077);	/* disallow non-owner access */

    authfp = fopen (authfilename, "rb");
    if (!authfp) {
	int olderrno = errno;

					/* if file there then error */
	if (access (authfilename, F_OK) == 0) {	 /* then file does exist! */
	    errno = olderrno;
	    return -1;
	}				/* else ignore it */
	fprintf (stderr,
		 "%s:  file %s does not exist\n",
		 ProgramName, authfilename);
    } else {
	xauth_existed = True;
	n = read_auth_entries (authfp, False, &head, &tail);
	(void) fclose (authfp);
	if (n < 0) {
	    fprintf (stderr,
		     "%s:  unable to read auth entries from file \"%s\"\n",
		     ProgramName, authfilename);
	    return -1;
	xauth_head = head;

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