SB2019061109 - Stored XSS in Support Board - Chat And Help Desk plugin for WordPress

Description

This security bulletin contains information about 1 security vulnerability.

1) Cross-site scripting (CVE-ID: N/A)

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

The vulnerability exists due to weak security measures like bad textarea data filtering. 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:

Example #1: <img src=x onerror=alert(document.cookie)>
Example #2: <img src=x onerror=alert('m0ze');window.open('//m0ze.ru/')>
Example #3: <img src=x onerror=alert('m0ze');window.location='//m0ze.ru/'>

Remediation

Install update from vendor's website.

References

• https://wpvulndb.com/vulnerabilities/9351/
• https://codecanyon.net/item/support-board-chat-and-help-desk/20752085