Open redirect in Nextcloud User Saml

1) Open redirect

EUVDB-ID: #VU85587

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-22400

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

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 user_saml within the RelayState parameter. 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

User Saml: 5.0.0 - 6.0.0

CPE2.3

• cpe:2.3:a:nextcloud:user_saml:5.2.4:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:user_saml:5.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:user_saml:5.2.2:*:*:*:*:*:*:*

External links

http://github.com/nextcloud/security-advisories/security/advisories/GHSA-622q-xhfr-xmv7
http://github.com/nextcloud/user_saml/pull/788
http://github.com/nextcloud/user_saml/commit/b184304a476deeba36e92b70562d5de7c2f85f8a
http://hackerone.com/reports/2263044

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.