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Free Simple CMS 1.0 Cross Site Scripting / Local File Inclusion

Free Simple CMS 1.0 Cross Site Scripting / Local File Inclusion
Posted Jun 16, 2011
Authored by High-Tech Bridge SA | Site htbridge.com

Free Simple CMS version 1.0 suffers from cross site scripting and local file inclusion vulnerabilities.

tags | exploit, local, vulnerability, xss, file inclusion
SHA-256 | fac147387be53cf36a5687dfa3256cc2c8681237448aa792693644fe4bd61c25

Free Simple CMS 1.0 Cross Site Scripting / Local File Inclusion

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Vulnerability ID: HTB23010
Reference: http://www.htbridge.ch/advisory/multiple_xss_in_free_simple_cms.html
Product: Free Simple CMS
Vendor: Dustin Cowell Enterprises ( http://www.freesimplesoft.com/ )
Vulnerable Version: 1.0 and probably prior
Tested on: 1.0
Vendor Notification: 25 May 2011
Vulnerability Type: XSS (Cross Site Scripting), Local File Inclusion
Risk level: High
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ )

Vulnerability Details:
High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in Free Simple CMS , which can be exploited to perform cross-site scripting attacks.

1) Input appended to the URL after index.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of affected website

The following PoC code is available:

http://[host]/index.php/%27%3E%3Cscript%3Ealert%28document.cookie%29;%3C
/script%3E

2) Input passed via the GET "db_themes_background_color_page" parameter to /themes/default/index.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of affected website.

The following PoC code is available:

http://[host]/themes/default/index.php?db_themes_background_color_page=%
22%3E%3Cscript%3Ealert%28123%29;%3C/script%3E

Successful exploitation of the vulnerabilities requires that "register_globals" is enabled.

3) Input passed via the GET "include" parameter to index.php (when GET "page" parameter is set to "login" and GET "request" parameter is set to "forgot_password") is not properly verified before being used to include files.
This can be exploited to include arbitrary files from local resources via directory traversal sequences.

The following PoC code is available:

http://[host]/index.php?page=login&request=forgot_password&include=../..
/../../../../../../etc/passwd


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