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CVE-2023-39959— Existence of calendars and address books can be checked by unauthenticated users

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存在访问控制错误漏洞。攻击者利用该漏洞可以发送DAV请求，该请求会显示受害者是否存在具有给定标识符的日历或地址簿。

CVSS 3.5 · Low EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery
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I. Basic Information for CVE-2023-39959

Vulnerability Information
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Vulnerability Title
Existence of calendars and address books can be checked by unauthenticated users
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.9, 26.0.4, and 27.0.1, unauthenticated users could send a DAV request which reveals whether a calendar or an address book with the given identifier exists for the victim. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 访问控制错误漏洞
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存在访问控制错误漏洞。攻击者利用该漏洞可以发送DAV请求，该请求会显示受害者是否存在具有给定标识符的日历或地址簿。
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, < 25.0.9 -

II. Public POCs for CVE-2023-39959

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III. Intelligence Information for CVE-2023-39959

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Patches & Fixes for CVE-2023-39959 (1)

Vendor Advisories for CVE-2023-39959 (1)

Other References for CVE-2023-39959 (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-2023-39953 4.8 MEDIUM Issuer not verified from obtained token in user_oidc
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-2023-39961 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-284

V. Comments for CVE-2023-39959

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