HTB23165: Multiple Vulnerabilities in BigTree CMS

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    • #8549
      AndyP
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      Advisory ID: HTB23165
      Product: BigTree CMS
      Vendor: BigTree CMS
      Vulnerable Versions: 4.0 RC2 and probably prior
      Tested Version: 4.0 RC2
      Vendor Notification: July 17, 2013
      Vendor Fix: July 17, 2013
      Public Disclosure: August 7, 2013
      Vulnerability Type: SQL Injection [CWE-89], Cross-Site Scripting [CWE-79], Cross-Site Request Forgery [CWE-352]
      CVE References: CVE-2013-4879, CVE-2013-4880, CVE-2013-4881
      Risk Level: High
      CVSSv2 Base Scores: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P), 5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P), 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
      Solution Status: Fixed by Vendor
      Discovered and Provided: High-Tech Bridge Security Research Lab

      Advisory Details:
      High-Tech Bridge Security Research Lab discovered multiple vulnerabilities in BigTree CMS, which can be exploited to perform SQL injection, Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) attacks. A remote attacker can add, modify or delete information in application’s database and gain complete control over the application.

      1) SQL Injection in BigTree CMS: CVE-2013-4879
      The vulnerability exists due to insufficient sanitisation of user-supplied data passed to “/site/index.php” script. A remote unauthenticated attacker can execute arbitrary SQL commands in application’s database.

      The following PoC (Proof of Concept) code displays version of MySQL server:


      http://[host]/site/index.php/%27and%28select%201%20from%28select%20count%28*%29%2cconcat%28%28select %20concat%28version%28%29%29%29%2cfloor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20 group%20by%20x%29a%29and%27

      SQL injection vulnerability was independently discovered by the Vendor just before High-Tech Bridge Security Research Lab.

      2) Сross-Site Request Forgery (CSRF) in BigTree CMS: CVE-2013-4881
      The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can create a malicious web page with CSRF exploit, trick a logged-in administrator into opening that page and create a new user with administrative privileges.

      The basic CSRF exploit below will create a new administrator “attacker” with password “password”:











      3) Cross-Site Scripting (XSS) in BigTree CMS: CVE-2013-4880
      The vulnerability exists due to insufficient filtration of user-supplied data in “module” HTTP GET parameter passed to “/site/index.php/admin/developer/modules/views/add/” URL. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

      The exploitation example below uses the “alert()” JavaScript function to display administrator’s cookies:


      http://[host]/site/index.php/admin/developer/modules/views/add/?module=%22%3E%3Cscript%3Ealert%28doc ument.cookie%29;%3C/script%3E&table=1&title=dolfbnwl

      Solution:
      Replace the following files with their updated versions from GitHub:
      core/inc/bigtree/cms.php
      core/admin/modules/users/create.php
      core/admin/modules/developer/modules/views/add.php

      More Information:
      https://github.com/bigtreecms/BigTree-CMS/commit/c5f27bf66a7f35bd3daeb5f693f3e2493f51b1f3
      https://github.com/bigtreecms/BigTree-CMS/commit/4b0faa90fa8b9e1776c86db716894dcd7e6b4834
      https://github.com/bigtreecms/BigTree-CMS/commit/8a59c2e13f8e151b6a9e98f73e641e1ec8d928df

      References:
      [1] High-Tech Bridge Advisory HTB23165 – https://www.htbridge.com/advisory/HTB23165 – Multiple Vulnerabilities in BigTree CMS.
      [2] BigTree CMS – http://www.bigtreecms.org/ – BigTree CMS is an open source content management system built on PHP and MySQL.
      [3] Common Vulnerabilities and Exposures (CVE) – http://cve.mitre.org/ – international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
      [4] Common Weakness Enumeration (CWE) – http://cwe.mitre.org – targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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