CVE-2023-23942— Self reflected HTML injection in Desktop client
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 Desktop Client 3.6.3之前版本存在跨站脚本漏洞，该漏洞源于缺少对qml标签的清理，从而导致javascript注入。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2023-23942
Vulnerability Information
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Vulnerability Title
Self reflected HTML injection in Desktop client
Source: CVE Program / CVE List V5
Vulnerability Description
The Nextcloud Desktop Client is a tool to synchronize files from a Nextcloud Server with your computer. Versions prior to 3.6.3 are missing sanitisation on qml labels which are used for basic HTML elements such as `strong`, `em` and `head` lines in the UI of the desktop client. The lack of sanitisation may allow for javascript injection. It is recommended that the Nextcloud Desktop Client is upgraded to 3.6.3. 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:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 跨站脚本漏洞
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 Desktop Client 3.6.3之前版本存在跨站脚本漏洞，该漏洞源于缺少对qml标签的清理，从而导致javascript注入。
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 | < 3.6.3 | - |
|
II. Public POCs for CVE-2023-23942
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-23942 (1)
-
https://github.com/nextcloud/desktop/pull/5233 x_refsource_MISC
Vendor Advisories for CVE-2023-23942 (1)
Other References for CVE-2023-23942 (1)
-
https://hackerone.com/reports/1788598 x_refsource_MISC
Same Patch Batch · nextcloud · 2023-02-06 · 3 CVEs total
| CVE-2023-23943 | 5.0 MEDIUM | Blind SSRF via server URL input in the Nextcloud Mail app |
| CVE-2023-23944 | 2.0 LOW | Nexcloud Mail app temporarily stores cleartext password in database |
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V. Comments for CVE-2023-23942
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