CVE-2023-35927— Nextcloud system addressbooks can be modified by malicious trusted 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存在访问控制错误漏洞，该漏洞源于允许恶意服务器修改或删除源站系统通讯录中的VCard。受影响的产品和版本：NextCloud Server 25.0.0至25.0.7版本，26.0.0至26.0.2版本；Nextcloud Enterprise Server 21.0.0至21.0.9.12版本，22.0.0至22.2.10.12版本，23.0.0至23.0.12.7版本，24.
Possible ATT&CK Techniques 3 AI
T1133 · External Remote Services T1565.001 · Stored Data Manipulation T1098.003 · Additional Cloud Roles
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I. Basic Information for CVE-2023-35927
Vulnerability Information
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Vulnerability Title
Nextcloud system addressbooks can be modified by malicious trusted server
Source: CVE Program / CVE List V5
Vulnerability Description
NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again.
Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. Remove all trusted servers in the "Administration" > "Sharing" settings `…/index.php/settings/admin/sharing`. Afterwards, trigger a recreation of the local system addressbook with the following `occ dav:sync-system-addressbook`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
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，该漏洞源于允许恶意服务器修改或删除源站系统通讯录中的VCard。受影响的产品和版本：NextCloud Server 25.0.0至25.0.7版本，26.0.0至26.0.2版本；Nextcloud Enterprise Server 21.0.0至21.0.9.12版本，22.0.0至22.2.10.12版本，23.0.0至23.0.12.7版本，24.
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 | Nextcloud Server >= 25.0.0, < 25.0.7 | - |
|
II. Public POCs for CVE-2023-35927
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-35927 (1)
-
https://github.com/nextcloud/server/pull/38247 x_refsource_MISC
Vendor Advisories for CVE-2023-35927 (1)
Other References for CVE-2023-35927 (1)
-
https://hackerone.com/reports/1976754 x_refsource_MISC
Same Patch Batch · nextcloud · 2023-06-23 · 5 CVEs total
| CVE-2023-35172 | 8.7 HIGH | Nextcloud Server password reset endpoint is not brute force protected |
| CVE-2023-35928 | 8.5 HIGH | Nextcloud user scoped external storage can be used to gather credentials of other users |
| CVE-2023-35173 | 5.7 MEDIUM | End-to-End encrypted file-drops can be made inaccessible |
| CVE-2023-35171 | 4.1 MEDIUM | Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning |
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V. Comments for CVE-2023-35927
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