Vulnerability identifier: #VU50687

Vulnerability 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: CVE-2020-22840

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
b2evolution
Web applications / CMS

Vendor: b2evolution.net

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in the "email_passthrough.php" script. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

b2evolution: 6.11.6

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External links
http://packetstormsecurity.com/files/161362/b2evolution-CMS-6.11.6-Open-Redirection.html
http://github.com/b2evolution/b2evolution/issues/102
http://www.exploit-db.com/exploits/49554

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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.