Vulnerability identifier: #VU79693

Vulnerability risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32786

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mod_auth_openidc
Web applications / Modules and components for CMS

Vendor:

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 oidc_validate_redirect_url() function. 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

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External links
http://daniel.haxx.se/blog/2017/01/30/one-url-standard-please/
http://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9
http://github.com/zmartzone/mod_auth_openidc/commit/3a115484eb927bc6daa5737dd84f88ff4bbc5544
http://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-xm4c-5wm5-jqv7
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QXAWKPT5LXZSUTFSJ6IWSZC7RMYYQXQD/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZVF6BSJLRQZ7PFFR4X5JSU6KUJYNOCU/
http://security.netapp.com/advisory/ntap-20210902-0001/
http://www.oracle.com/security-alerts/cpuapr2022.html
http://lists.debian.org/debian-lts-announce/2023/04/msg00034.html

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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.