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CVE-2023-28643— Potential share collision for recipients when caching is enabled 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 serve存在安全漏洞，该漏洞源于启用缓存时收件人可能发生共享冲突。受影响的产品和版本：Nextcloud serve 24.0.9之前的24.0.x版本， 25.0.3之前的25.0.x版本。

CVSS 5.5 · Medium EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer
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I. Basic Information for CVE-2023-28643

Vulnerability Information
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Vulnerability Title
Potential share collision for recipients when caching is enabled in nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9. Users unable to upgrade should avoid sharing 2 folders with the same name to the same user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
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 serve存在安全漏洞，该漏洞源于启用缓存时收件人可能发生共享冲突。受影响的产品和版本：Nextcloud serve 24.0.9之前的24.0.x版本， 25.0.3之前的25.0.x版本。
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 < 24.0.9 -

II. Public POCs for CVE-2023-28643

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III. Intelligence Information for CVE-2023-28643

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Patches & Fixes for CVE-2023-28643 (1)

Vendor Advisories for CVE-2023-28643 (1)

Other References for CVE-2023-28643 (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-2023-28644 5.7 MEDIUM Reference fetch can saturate the server bandwidth for 10 seconds 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-706

V. Comments for CVE-2023-28643

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