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CVE-2021-32652— Missing permission check on email metadata retrieval

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 Mail 1.4.3之前版本，1.8.2版本存在访问控制错误漏洞，该漏洞源于权限检查缺失，允许另一个经过身份验证的用户访问其他用户的邮件元数据。

CVSS 8.8 · High EPSS 1.11% · P65

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-32652

Vulnerability Information
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Vulnerability Title
Missing permission check on email metadata retrieval
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Mail is a mail app for the Nextcloud platform. A missing permission check in Nextcloud Mail before 1.4.3 and 1.8.2 allows another authenticated users to access mail metadata of other users. Versions 1.4.3 and 1.8.2 contain patches for this vulnerability; no workarounds other than the patches are known to exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 Mail 1.4.3之前版本，1.8.2版本存在访问控制错误漏洞，该漏洞源于权限检查缺失，允许另一个经过身份验证的用户访问其他用户的邮件元数据。
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 < 1.4.3 -

II. Public POCs for CVE-2021-32652

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III. Intelligence Information for CVE-2021-32652

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Vendor Advisories for CVE-2021-32652 (1)

Other References for CVE-2021-32652 (1)

Same Patch Batch · nextcloud · 2021-06-01 · 6 CVEs total

CVE-2021-32656 8.6 HIGH Trusted servers exchange can be triggered by attacker
CVE-2021-32654 8.1 HIGH Attacker can obtain write access to any federated share/public link
CVE-2021-32657 4.3 MEDIUM Malicious user could break user administration page
CVE-2021-32655 3.5 LOW Files Drop public link can be added as federated share
CVE-2021-32653 2.7 LOW Default settings leak federated cloud ID to lookup server of all users

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2021-32652

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