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CVE-2023-28644— Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server

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 25.0.3 之前的 25.0.x版本存在资源管理错误漏洞，该漏洞源于低效的提取操作可能会影响服务器性能或可能导致拒绝服务。

CVSS 5.7 · Medium EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-28644

Vulnerability Information
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Vulnerability Title
Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source home cloud implementation. In releases of the 25.0.x branch before 25.0.3 an inefficient fetch operation may impact server performances and/or can lead to a denial of service. This issue has been addressed and it is recommended that the Nextcloud Server is upgraded to 25.0.3. There are no known workarounds for this vulnerability.
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 25.0.3 之前的 25.0.x版本存在资源管理错误漏洞，该漏洞源于低效的提取操作可能会影响服务器性能或可能导致拒绝服务。
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 >= 25.0.0, < 25.0.3 -

II. Public POCs for CVE-2023-28644

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III. Intelligence Information for CVE-2023-28644

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Patches & Fixes for CVE-2023-28644 (1)

Vendor Advisories for CVE-2023-28644 (1)

Same Patch Batch · nextcloud · 2023-03-30 · 7 CVEs total

CVE-2023-26482 9.1 CRITICAL Scope of workflow operations is not validated in nextcloud server
CVE-2023-28643 5.5 MEDIUM Potential share collision for recipients when caching is enabled in nextcloud server
CVE-2023-28646 4.4 MEDIUM App lockout in nextcloud Android app can be bypassed via thirdparty apps
CVE-2023-28647 4.4 MEDIUM App pin of the iOS app can be bypassed in Nextcloud iOS
CVE-2023-28835 3.5 LOW Insecure randomness for default password in nextcloud
CVE-2023-28833 2.4 LOW Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud s

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-28644

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