Multiple XSS vulnerabilities in Events Manager WordPress plugin

[advisory@xxxxxxxxxxxx]

Advisory ID: HTB23139
Product: Events Manager WordPress plugin
Vendor: Marcus Sykes
Vulnerable Version(s): 5.3.3 and probably prior
Tested Version: 5.3.3
Vendor Notification: January 16, 2013 
Vendor Patch: January 17, 2013 
Public Disclosure: March 6, 2013 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-1407
Risk Level: Medium 
CVSSv2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered multiple XSS vulnerabilities 
in Events Manager WordPress plugin, which can be exploited to perform 
Cross-Site Scripting attacks.


1) Multiple XSS vulnerabilities in Events Manager WordPress plugin: 
CVE-2013-1407

1.1 The vulnerability exists due to insufficient filtration of user-supplied 
data in "scope" HTTP GET parameter passed to "/index.php" script. A remote 
attacker can trick user to open a specially crafted link and execute arbitrary 
HTML and script code in browser in context of the vulnerable website.

PoC (Proof-of-Concept) below uses the "alert()" JavaScript function to display 
user's cookies: 

http://[host]/?page_id=42&scope=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E,%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E


1.2 The vulnerability exists due to insufficient filtration of user-supplied 
data in "_wpnonce" HTTP GET parameter passed to "/wp-admin/edit.php" script. A 
remote attacker can trick logged-in administrator to open a specially crafted 
link and execute arbitrary HTML and script code in browser in context of the 
vulnerable website.

PoC (Proof-of-Concept) below uses "alert()" JavaScript function to display 
administrator's cookies: 

http://[host]/wp-admin/edit.php?post_type=event&page=events-manager-bookings&_wpnonce=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E


1.3 The vulnerabilities exist due to insufficient filtration of user-supplied 
data in "user_name", "dbem_phone" and "user_email" HTTP GET parameters passed 
to "/index.php" script. A remote attacker can trick user to open a specially 
crafted link and execute arbitrary HTML and script code in browser in context 
of the vulnerable website.

PoCs (Proof-of-Concept) below use the "alert()" JavaScript function to display 
user's cookies: 

http://[host]/?event=1&user_name=%27%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/?event=1&dbem_phone=%27%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/?event=1&user_email=%27%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E


1.4 The vulnerability exists due to insufficient filtration of user-supplied 
data in "booking_comment" HTTP POST parameter passed to "/index.php" script. A 
remote attacker can trick user to open a specially crafted link and execute 
arbitrary HTML and script code in browser in context of the vulnerable website.

PoC (Proof-of-Concept) below uses the "alert()" JavaScript function to display 
user's cookies: 


<form action="http://[host]/?event=1"; method="post" name="askform">
<input type="hidden" name="booking_comment" 
value="</textarea><script>alert(document.cookie);</script>"/>
<input type="submit" id="btn">
</form>


Vulnerabilities 1.3 and 1.4 will work only against unauthorized (not logged-in) 
users. Successful exploitation of these vulnerabilities also requires that 
event with id = 1 has turned-on registration. 


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Solution:

Upgrade to Events Manager 5.3.4

More Information:
http://wordpress.org/extend/plugins/events-manager/changelog/
http://wp-events-plugin.com/blog/2013/01/22/5-3-5-released-includes-a-security-update/

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References:

[1] High-Tech Bridge Advisory HTB23139 - 
https://www.htbridge.com/advisory/HTB23139 - Multiple XSS vulnerabilities in 
Events Manager WordPress plugin.
[2] Events Manager - http://wp-events-plugin.com - Events Manager is a 
full-featured event registration plugin for WordPress based on the principles 
of flexibility, reliability and powerful features.
[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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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.