#VU63468 Open redirect in mod_auth_mellon - CVE-2021-3639

Vulnerability identifier: #VU63468

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3639

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mod_auth_mellon
Universal components / Libraries / Libraries used by multiple products

Vendor: John Dennis

Description

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

The vulnerability exists due to improper sanitization of logout URLs in mod_auth_mellon. A remote attacker can create a link that leads to a trusted website, trick the victim to open it and redirect 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

mod_auth_mellon: 0.4.0 - 0.17.0

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External links
https://access.redhat.com/errata/RHSA-2022:4690

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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.