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Two Reflected XSS Vulnerabilities in Calls to Action WordPress plugin

Advisory ID:HTB23274
Product:Calls to Action WordPress plugin
Vendor:InboundNow
Vulnerable Versions:2.4.3 and probably prior
Tested Version:2.4.3
Advisory Publication:October 7, 2015 [without technical details]
Vendor Notification:October 7, 2015
Vendor Fix:October 27, 2015
Public Disclosure:November 4, 2015
Latest Update:October 29, 2015
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2015-8350
Risk Level:Medium
CVSSv3 Base Score:6.1 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N]
CVSSv3 Calculator
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge Security Research Lab discovered two Cross-Site Scripting (XSS) vulnerabilities in a popular WordPress plugin Calls to Action. A remote attacker might be able to steal user's and administrator’s cookies, credentials and browser history, modify web page content to perform phishing attacks, or even to perform drive-by-download attacks by injecting malware into website pages when the victim follows a specially crafted link with XSS exploit.


1) Two Reflected XSS Vulnerabilities in Calls to Action WordPress plugin: CVE-2015-8350

1.1 Input passed via the "open-tab" HTTP GET parameter 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.

A simple XSS exploit below will display JavaScript popup with "ImmuniWeb" word, when the logged-in administrators follows the malicious link:

http://[host]/wp-admin/edit.php?post_type=wp-call-to-action&page=wp_cta_glob al_settings&open-tab=%27%3E%3Cscript%3Ealert%28ImmuniWeb%29%3B%3C%2Fscript%3 E


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

A simple XSS exploit below will display JavaScript popup with "ImmuniWeb" word, when the victim follows the malicious link:

http://[host]/cta/ab-testing-call-to-action-example/?wp-cta-variation-id=%27 %22%3E%3Cscript%3Ealert%28ImmuniWeb%29;%3C/script%3E


ImmuniWeb® On-Demand Web Application Penetration Test


Solution:
Update to Calls to Action 2.5.1

More Information:
https://github.com/inboundnow/cta/issues/137
https://wordpress.org/plugins/cta/changelog/


References:
[1] High-Tech Bridge Advisory HTB23274 - https://www.htbridge.com/advisory/HTB23274 - Two Reflected XSS Vulnerabilities in Calls to Action WordPress plugin.
[2] Calls to Action WordPress plugin - http://www.inboundnow.com - Displays Targeted Calls to Action on your WordPress site.
[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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