CVE-2024-52520: nextcloud server DoS — Fix

Description

Nextcloud Server is a self hosted personal cloud system. Due to a pre-flighted HEAD request, the link reference provider could be tricked into downloading bigger websites than intended, to find open-graph data. It is recommended that the Nextcloud Server is upgraded to 28.0.10 or 29.0.7 and Nextcloud Enterprise Server is upgraded to 27.1.11.8, 28.0.10 or 29.0.7.

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CVSS v3.1 Score

5.7

MEDIUM

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

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
nextcloud	nextcloud_server	27.0.0 — 27.1.11.8
nextcloud	nextcloud_server	28.0.0 — 28.0.10
nextcloud	nextcloud_server	28.0.0 — 28.0.10
nextcloud	nextcloud_server	29.0.0 — 29.0.7
nextcloud	nextcloud_server	29.0.0 — 29.0.7

References

Advisories & Patches

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxqf-cfxw-mqmj https://github.com/nextcloud/server/commit/873c42b0f1383d5b6f2b7a481e1d9620ed30f44a https://github.com/nextcloud/server/pull/47627

Frequently Asked Questions

What is CVE-2024-52520? +

Nextcloud Server is a self hosted personal cloud system. Due to a pre-flighted HEAD request, the link reference provider could be tricked into downloading bigger websites than intended, to find open-graph data. It is recommended that the Nextcloud Server is upgraded to 28.0.10 or 29.0.7 and Nextcloud Enterprise Server is upgraded to 27.1.11.8, 28.0.10 or 29.0.7. It has a CVSS v3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2024-52520? +

CVE-2024-52520 has a CVSS v3.1 score of 5.7 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-2024-52520? +

CVE-2024-52520 affects products from nextcloud, specifically: nextcloud_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-52520? +

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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