CVE-2021-32733— XSS in Nextcloud Text application
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 Text在19.0.13、20.0.11和21.0.3之前的版本中存在跨站脚本漏洞，该漏洞是一个跨站脚本漏洞。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-32733
Vulnerability Information
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Vulnerability Title
XSS in Nextcloud Text application
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a `text/html` Content-Type when serving files to users. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. As a workaround, use a browser that has support for Content-Security-Policy.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/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 Text在19.0.13、20.0.11和21.0.3之前的版本中存在跨站脚本漏洞，该漏洞是一个跨站脚本漏洞。
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 | < 19.0.13 | - |
|
II. Public POCs for CVE-2021-32733
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2021-32733 (1)
-
https://github.com/nextcloud/text/pull/1689 x_refsource_MISC
Vendor Advisories for CVE-2021-32733 (1)
Other References for CVE-2021-32733 (1)
-
https://hackerone.com/reports/1241460 x_refsource_MISC
Same Patch Batch · nextcloud · 2021-07-12 · 14 CVEs total
| CVE-2021-32688 | 8.8 HIGH | Application specific tokens can change their own scope |
| CVE-2021-32689 | 8.1 HIGH | Nextcloud Talk not properly disassociating users from chats after account deletion |
| CVE-2021-32726 | 7.1 HIGH | Webauthn tokens not removed after user has been deleted |
| CVE-2021-32727 | 5.7 MEDIUM | End-to-end encryption device setup did not verify public key |
| CVE-2021-32741 | 5.3 MEDIUM | Lack of ratelimit on public share link mount endpoint |
| CVE-2021-32705 | 5.3 MEDIUM | Lack of ratelimit on public DAV endpoint |
| CVE-2021-32703 | 5.3 MEDIUM | Lack of ratelimit on shareinfo endpoint |
| CVE-2021-32707 | 4.3 MEDIUM | Bypass of image blocking in Nextcloud Mail |
| CVE-2021-32678 | 3.7 LOW | Ratelimit not applied on OCS API responses |
| CVE-2021-32725 | 3.5 LOW | Default share permissions not respected for federated reshares |
| CVE-2021-32679 | 3.5 LOW | Filenames not escaped by default in controllers using DownloadResponse |
| CVE-2021-32680 | 3.3 LOW | Audit log is not properly logging unsetting of share expiration date |
| CVE-2021-32734 | 3.1 LOW | File path disclosure of shared files in Nextcloud Text application |
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