Function Call With Incorrectly Specified Argument Value

Demonstrations

The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.

Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.

Example One

This Perl code intends to record whether a user authenticated successfully or not, and to exit if the user fails to authenticate. However, when it calls ReportAuth(), the third argument is specified as 0 instead of 1, so it does not exit.

sub ReportAuth {
  my ($username, $result, $fatal) = @_;
  PrintLog("auth: username=%s, result=%d", $username, $result);
  if (($result ne "success") && $fatal) {
    die "Failed!\n";
  }
}

sub PrivilegedFunc
{
  my $result = CheckAuth($username);
  ReportAuth($username, $result, 0);
  DoReallyImportantStuff();
}

See Also