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WordPress Calls To Action 2.4.3 Cross Site Scripting

WordPress Calls To Action 2.4.3 Cross Site Scripting
Posted Dec 2, 2015
Authored by High-Tech Bridge SA | Site htbridge.com

WordPress Calls to Action plugin version 2.4.3 suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2015-8350
SHA-256 | 458830b56600d9f6b97ed18aa8b64a58c79fa0079b1d611d70b3c7fd209bdca2

WordPress Calls To Action 2.4.3 Cross Site Scripting

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Advisory ID: HTB23274
Product: Calls to Action WordPress plugin
Vendor: InboundNow
Vulnerable Version(s): 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 Patch: October 27, 2015
Public Disclosure: November 4, 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]
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 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_global_settings&open-tab=%27%3E%3Cscript%3Ealert%28ImmuniWeb%29%3B%3C%2Fscript%3E


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

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Solution:

Update to Calls to Action 2.5.1

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

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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® SaaS - https://www.htbridge.com/immuniweb/ - hybrid of manual web application penetration test and cutting-edge vulnerability scanner available online via a Software-as-a-Service (SaaS) model.

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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.
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