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CVE-2022-39346— Missing length validation of user displayname 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存在资源管理错误漏洞，该漏洞源于没有正确限制用户的显示名称，这可能允许恶意用户超载备份数据库并导致拒绝服务。

CVSS 3.5 · Low EPSS 1.07% · P64

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-39346

Vulnerability Information
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Vulnerability Title
Missing length validation of user displayname in nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source personal cloud server. Affected versions of nextcloud server did not properly limit user display names which could allow a malicious users to overload the backing database and cause a denial of service. It is recommended that the Nextcloud Server is upgraded to 22.2.10, 23.0.7 or 24.0.3. There are no known workarounds for this issue.
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:L
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 Server存在资源管理错误漏洞，该漏洞源于没有正确限制用户的显示名称，这可能允许恶意用户超载备份数据库并导致拒绝服务。
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 < 22.2.10 -

II. Public POCs for CVE-2022-39346

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III. Intelligence Information for CVE-2022-39346

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Patches & Fixes for CVE-2022-39346 (1)

Vendor Advisories for CVE-2022-39346 (1)

Mailing List Discussions for CVE-2022-39346 (3)

Other References for CVE-2022-39346 (1)

Same Patch Batch · nextcloud · 2022-11-25 · 8 CVEs total

CVE-2022-39331 4.6 MEDIUM Cross-site Scripting (XSS) in Nexcloud Desktop Client
CVE-2022-39332 4.6 MEDIUM Cross-site scripting (XSS) in Nextcloud Desktop Client
CVE-2022-39333 4.6 MEDIUM Cross-site scripting (XSS) in Nextcloud Desktop Client
CVE-2022-39339 4.3 MEDIUM Cleartext Transmission of Sensitive Information in user_oidc
CVE-2022-39334 3.9 LOW nextcloudcmd incorrectly trusts bad TLS certificates
CVE-2022-39338 3.5 LOW Stored cross site scripting (XSS) vulnerability via Authorization Endpoint in user_oidc
CVE-2022-41926 3.3 LOW Nextcloud Talk Android broadcast incorrect permission handling

IV. Related Vulnerabilities

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

V. Comments for CVE-2022-39346

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