CVE-2024-37312: user oidc Access Control Flaw — Exploit

Description

user_oidc app is an OpenID Connect user backend for Nextcloud. Missing access control on the ID4me endpoint allows an attacker to register an account eventually getting access to data that is available to all registered users. It is recommended that the OpenID Connect user backend is upgraded to 3.0.0 (Nextcloud 20-23), 4.0.0 (Nexcloud 24) or 5.0.0 (Nextcloud 25-28).

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CVSS v3.1 Score

6.3

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
nextcloud	user_oidc	< 5.0.0

References

Advisories & Patches

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-vw7g-959g-vj6q https://github.com/nextcloud/user_oidc/commit/9f68a716ecd264160a7c098b8840313f1ac855f2 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-vw7g-959g-vj6q https://github.com/nextcloud/user_oidc/commit/9f68a716ecd264160a7c098b8840313f1ac855f2

Exploits

https://hackerone.com/reports/2376929 https://hackerone.com/reports/2376929

Frequently Asked Questions

What is CVE-2024-37312? +

user_oidc app is an OpenID Connect user backend for Nextcloud. Missing access control on the ID4me endpoint allows an attacker to register an account eventually getting access to data that is available to all registered users. It is recommended that the OpenID Connect user backend is upgraded to 3.0.0 (Nextcloud 20-23), 4.0.0 (Nexcloud 24) or 5.0.0 (Nextcloud 25-28). It has a CVSS v3.1 base score of 6.3 (MEDIUM).

How severe is CVE-2024-37312? +

CVE-2024-37312 has a CVSS v3.1 score of 6.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-37312? +

CVE-2024-37312 affects products from nextcloud, specifically: user_oidc. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-37312? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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