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CVE-2023-28833— Unrestricted filenames for logo or favicon as admin in the theming settings 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 server存在代码问题漏洞，该漏洞源于在主题设置中以管理员身份上传网站图标时能够控制文件名。受影响的产品和版本：Nextcloud server 24.0.10之前的24.0.x版本，25.0.4之前的25.0.x版本。

CVSS 2.4 · Low EPSS 0.76% · P54
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I. Basic Information for CVE-2023-28833

Vulnerability Information
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Vulnerability Title
Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source home cloud implementation. In affected versions admins of a server were able to upload a logo or a favicon and to provided a file name which was not restricted and could overwrite files in the appdata directory. Administrators may have access to overwrite these files by other means but this method could be exploited by tricking an admin into uploading a maliciously named file. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should avoid ingesting logo files from untrusted sources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 代码问题漏洞
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 server存在代码问题漏洞，该漏洞源于在主题设置中以管理员身份上传网站图标时能够控制文件名。受影响的产品和版本：Nextcloud server 24.0.10之前的24.0.x版本，25.0.4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 < 24.0.10 -

II. Public POCs for CVE-2023-28833

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III. Intelligence Information for CVE-2023-28833

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Patches & Fixes for CVE-2023-28833 (1)

Vendor Advisories for CVE-2023-28833 (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-2023-28643 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

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-22

V. Comments for CVE-2023-28833

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