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Reflected XSS in Ultimate Member WordPress Plugin

Advisory ID:HTB23277
Product:Ultimate Member WordPress plugin
Vendor:Ultimate Member
Vulnerable Versions:1.3.28 and probably prior
Tested Version:1.3.28
Advisory Publication:October 29, 2015 [without technical details]
Vendor Notification:October 29, 2015
Vendor Fix:October 31, 2015
Public Disclosure:November 19, 2015
Latest Update:November 18, 2015
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2015-8354
Risk Level:Medium
CVSSv2 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

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in Ultimate Member WordPress plugin, intended for managing users’ profiles. The vulnerability can be used against website administrators to perform Cross-Site Scripting (XSS) attacks.

Anonymous attacker might be able to steal 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 website administrator follows a specially crafted link with XSS exploit.

The vulnerability is caused by absence of filtration of input-data passed via the "_refer" HTTP GET parameter to "wp-admin/users.php" script, when "update" is set to value "confirm_delete". A remote unauthenticated 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 exploit below will display JS popup with "ImmuniWeb" word:

http://[host]/wp-admin/users.php?update=confirm_delete&_refer='"><script>ale rt('ImmuniWeb');</script>

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Update to Ultimate Member 1.3.29

[1] High-Tech Bridge Advisory HTB23277 - - Reflected XSS in Ultimate Member WordPress Plugin.
[2] Ultimate Member Wordpress plugin - - The easiest way to create powerful online communities and beautiful user profiles with WordPress.
[3] Common Vulnerabilities and Exposures (CVE) - - 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) - - 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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