[UNIX] myBloggie SQL Injection/Privilege Escalation

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myBloggie SQL Injection/Privilege Escalation
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SUMMARY

<http://mybloggie.mywebland.com/> myBloggie is "a Weblog system built
using PHP and mySQL".

myBloggie vulnerable to SQL injection vulnerability caused by improper
validation of user-supplied inputs. This vulnerability can be exploited to
bypass authentication mechanism, escalate the privileges to administrator
level and also made to reveal system specific information.

DETAILS

Vulnerable Systems:
* myBloggie versions 2.1.3-beta and prior

User supplied credential inputs ('$username' and '$passwd') are not
sanitized in login.php before subjecting them to SQL query.

Vulnerable code:
<----------------------------login.php
snippet--------------------------------->
if (isset($_POST['username'])) {
$username=$_POST['username'];
} else $username="";

$result = mysql_query( "SELECT user FROM ".USER_TBL." WHERE
user='$username'
AND password='$passwd'" ) or error( mysql_error() );
<--------------------------------------------------------------------------->

This can be exploited in multiple ways,
1. Authentication Bypass: A malicious user can log on to the weblog system
without submitting the password by placing queries such as this "admin' OR
'x'='x" in the User Name field.
2. Privilege Escalation: When a non-administrative user submits, for
example "user1' OR 'x'='x", into the User Name field, administrative
privileges will be granted.
3. Path Disclosure: Path information can be made to disclose in error
pages by passing invalid query to User Name field of login.php.

Proof of Concept:
POST http://example.com/mybloggie/login.php?username=admin' OR 'x'='x
POST http://example.com/mybloggie/login.php?username=normal_user' OR
'one'='one
POST http://example.com/mybloggie/login.php?username='1=1 --

Patch Availability:
Patch: <http://mywebland.com/forums/showtopic.php?t=399>
http://mywebland.com/forums/showtopic.php?t=399

Disclosure Timeline:
* 01.09.05 - Issue Discovered
* 02.09.05 - Reported to the vendor
* 03.09.05 - Patch Released
* 05.09.05 - Advisory Released

ADDITIONAL INFORMATION

The information has been provided by <mailto:os2a.bto@gmail.com>
os2a.bto.

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