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CVE-2024-52521— Nextcloud Server has a potential hash collision for background jobs could skip queuing them

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存在安全漏洞，该漏洞源于MD5 哈希用于检查后台作业的唯一性。这增加了后台作业被错误地识别为已经存在且未排队执行的可能性。通过将哈希更改为 SHA256，可能性大大降低。

CVSS 2.6 · Low EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1547.004 · Winlogon Helper DLL
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I. Basic Information for CVE-2024-52521

Vulnerability Information
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Vulnerability Title
Nextcloud Server has a potential hash collision for background jobs could skip queuing them
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a self hosted personal cloud system. MD5 hashes were used to check background jobs for their uniqueness. This increased the chances of a background job with arguments falsely being identified as already existing and not be queued for execution. By changing the Hash to SHA256 the probability was heavily decreased. It is recommended that the Nextcloud Server is upgraded to 28.0.10, 29.0.7 or 30.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
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存在安全漏洞，该漏洞源于MD5 哈希用于检查后台作业的唯一性。这增加了后台作业被错误地识别为已经存在且未排队执行的可能性。通过将哈希更改为 SHA256，可能性大大降低。
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-2024-52521

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III. Intelligence Information for CVE-2024-52521

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Patches & Fixes for CVE-2024-52521 (1)

Vendor Advisories for CVE-2024-52521 (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-2024-52520 5.7 MEDIUM Nextcloud Server's link reference provider can be tricked into downloading bigger files th
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-2024-52525 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-328

V. Comments for CVE-2024-52521

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