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

1) Cross-site scripting

EUVDB-ID: #VU18864

Risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

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/'>

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Support Board - Chat And Help Desk: 1.0 - 1.2.8

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.