Reflected Cross-Site Scripting (XSS) in Google Calendar Events WordPress Plugin

Advisory ID:HTB23235
Product:Google Calendar Events WordPress plugin
Vendor:Phil Derksen
Vulnerable Versions:2.0.1 and probably prior
Tested Version:2.0.1
Advisory Publication:September 17, 2014 [without technical details]
Vendor Notification:September 17, 2014
Vendor Fix:October 7, 2014
Public Disclosure:October 8, 2014
Latest Update:October 7, 2014
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2014-7138
Risk Level:Low
CVSSv2 Base Score:2.6 (AV:N/AC:H/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 Security Research Lab discovered vulnerability in Google Calendar Events WordPress plugin, which can be exploited to perform Cross-Site Scripting (XSS) attacks against administrator of a WordPress website with vulnerable plugin.


1) Reflected Cross-Site Scripting (XSS) in Google Calendar Events WordPress Plugin: CVE-2014-7138

Input passed via the "gce_feed_ids" HTTP GET parameter to "/wp-admin/admin-ajax.php" script is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to display "immuniweb" word:

http://wordpress/wp-admin/admin-ajax.php?action=gce_ajax&gce_type=page&gce_f eed_ids=%27%22%3E%3Cscript%3Ealert%28/immuniweb/%29;%3C/script%3E

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Solution:
Update to Google Calendar Events 2.0.4

More Information:
https://github.com/pderksen/WP-Google-Calendar-Events/commit/df1fe1d71f8ce9496cc601c96839c474e49db91d
https://github.com/pderksen/WP-Google-Calendar-Events/commit/a701ceeb410bdda9d96c9d3d12104630df5d5b43


References:
[1] High-Tech Bridge Advisory HTB23235 - https://www.immuniweb.com/advisory/HTB23235 - Reflected Cross-Site Scripting (XSS) in Google Calendar Events WordPress Plugin.
[2] Google Calendar Events WordPress plugin - http://philderksen.com/ - Parses Google Calendar feeds and displays the events as a calendar grid or list on a page, post or widget.
[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.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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