Vulnerability identifier: #VU54306

Vulnerability risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34815

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Canopy
Other software / Other software solutions

Vendor: CheckSec

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 in the "LOGIN_PAGE_DISCLAIMER" parameter. A remote authenticated 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

Canopy: 3.5.1

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External links
http://www.checksec.com/canopy.html
http://www.compass-security.com/fileadmin/Research/Advisories/2021-10_CSNC-2021-015-Checksec_Canopy_HTLM_Injection.txt
http://www.compass-security.com/en/research/advisories

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.