Vulnerability identifier: #VU50170

Vulnerability risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2021-3318

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
DzzOffice
Client/Desktop applications / Office applications

Vendor: DzzOffice

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data passed via the "editorid" parameter in attach/ajax.php. 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.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

DzzOffice: 1.3.1 - 2.02.1

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External links
http://github.com/zyx0814/dzzoffice/issues/173

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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.