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CVE-2023-39953— Issuer not verified from obtained token in user_oidc

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 user_oidc是德国Nextcloud公司的一个应用程序 Nextcloud user_oidc 1.0.0版本至1.3.3之前版本存在安全漏洞，该漏洞源于缺少对发行者的验证。

CVSS 4.8 · Medium EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-39953

Vulnerability Information
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Vulnerability Title
Issuer not verified from obtained token in user_oidc
Source: CVE Program / CVE List V5
Vulnerability Description
user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud user_oidc 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud user_oidc是德国Nextcloud公司的一个应用程序 Nextcloud user_oidc 1.0.0版本至1.3.3之前版本存在安全漏洞，该漏洞源于缺少对发行者的验证。
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 >= 1.0.0, < 1.3.3 -

II. Public POCs for CVE-2023-39953

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III. Intelligence Information for CVE-2023-39953

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Patches & Fixes for CVE-2023-39953 (1)

Vendor Advisories for CVE-2023-39953 (1)

Other References for CVE-2023-39953 (1)

Same Patch Batch · nextcloud · 2023-08-10 · 10 CVEs total

CVE-2023-39963 8.1 HIGH Missing password confirmation when creating app passwords
CVE-2023-39962 7.7 HIGH Users can delete external storage mount points
CVE-2023-39952 6.5 MEDIUM Advanced permissions not respected when copying entire group folders
CVE-2023-39958 5.8 MEDIUM Missing brute force protection on password reset token OAuth2 API controller
CVE-2023-39954 3.8 LOW user_oidc app stores client secret unencrypted in database
CVE-2023-39955 3.5 LOW Notes attachment render HTML in preview mode
CVE-2023-39959 3.5 LOW Existence of calendars and address books can be checked by unauthenticated users
CVE-2023-39961 3.5 LOW Text does not respect "Allow download" permissions
CVE-2023-39957 Path traversal allows tricking the Talk Android app into writing files into it's root dire

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-303

V. Comments for CVE-2023-39953

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