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CVE-2024-52520— Nextcloud Server's link reference provider can be tricked into downloading bigger files than intended

Quick assessment

Affected
nextcloud security-advisories
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 存在资源管理错误漏洞，该漏洞源于由于预先发送的 HEAD 请求，链接引用提供程序可能会被诱骗下载比预期更大的网站，以查找开放图数据。

CVSS 5.7 · Medium EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-52520

Vulnerability Information
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Vulnerability Title
Nextcloud Server's link reference provider can be tricked into downloading bigger files than intended
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 存在资源管理错误漏洞，该漏洞源于由于预先发送的 HEAD 请求，链接引用提供程序可能会被诱骗下载比预期更大的网站，以查找开放图数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nextcloud security-advisories >= 28.0.0, < 28.0.10 -

II. Public POCs for CVE-2024-52520

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III. Intelligence Information for CVE-2024-52520

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Patches & Fixes for CVE-2024-52520 (1)

Vendor Advisories for CVE-2024-52520 (1)

Same Patch Batch · nextcloud · 2024-11-15 · 17 CVEs total

CVE-2024-52508 8.2 HIGH Nextcloud Mail auto configurator can be tricked into sending account information to wrong
CVE-2024-52511 6.3 MEDIUM Nextcloud Tables has an Authorization Bypass Through User-Controlled Key in Tables
CVE-2024-52515 5.7 MEDIUM Nextcloud Server has incomplete sanitization of SVG files allows to embed other images int
CVE-2024-52517 4.6 MEDIUM Nextcloud Server's global credentials of external storages are sent back to the frontend
CVE-2024-52523 4.6 MEDIUM Nextcloud Server Custom defined credentials of external storages are sent back to the fron
CVE-2024-52518 4.4 MEDIUM Nextcloud Server is missing password confirmation when changing external storage options
CVE-2024-52510 4.2 MEDIUM Nextcloud Desktop client behaves incorrectly if the initial end-to-end-encryption signatur
CVE-2024-52514 4.1 MEDIUM Nextcloud Server allows users to copy folder that contain files that are blocked by the fi
CVE-2024-52509 3.5 LOW Nextcloud Mail app does not respect download permissions in shares
CVE-2024-52507 3.5 LOW Share information of the Nextcloud Tables app is not limited to affected users
CVE-2024-52512 3.3 LOW Nextcloud User OIDC has an open redirection when logging in with User OIDC
CVE-2024-52516 3.0 LOW Nextcloud Server's shares are not removed when user is limited to share with in their grou
CVE-2024-52519 2.7 LOW Nextcloud Server's OAuth2 client secrets were stored in a recoverable way
CVE-2024-52513 2.6 LOW Nextcloud Server's Attachments folder for Text app is accessible on "Files drop" and "Pass
CVE-2024-52521 2.6 LOW Nextcloud Server has a potential hash collision for background jobs could skip queuing the
CVE-2024-52525 1.8 LOW Nextcloud Server User password is available in memory of the PHP process

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-400

V. Comments for CVE-2024-52520

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