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CVE-2021-37628— File Drop can be bypassed using Richdocuments app in nextcloud

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 Richdocuments存在信息泄露漏洞，该漏洞源于在受影响的版本中，Richdocuments OCS端点没有速率限制。这可能允许攻击者可利用该漏洞枚举潜在的有效共享令牌。建议将Nextcloud Richdocuments应用升级到3.8.4或4.2.1来解决。对于无法升级的用户，建议禁用Richdocuments应用程序。

CVSS 7.5 · High EPSS 2.09% · P81

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-37628

Vulnerability Information
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Vulnerability Title
File Drop can be bypassed using Richdocuments app in nextcloud
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Richdocuments is an open source collaborative office suite. In affected versions the File Drop features ("Upload Only" public link shares in Nextcloud) can be bypassed using the Nextcloud Richdocuments app. An attacker was able to read arbitrary files in such a share. It is recommended that the Nextcloud Richdocuments is upgraded to 3.8.4 or 4.2.1. If upgrading is not possible then it is recommended to disable the Richdocuments application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 信息泄露漏洞
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 Richdocuments存在信息泄露漏洞，该漏洞源于在受影响的版本中，Richdocuments OCS端点没有速率限制。这可能允许攻击者可利用该漏洞枚举潜在的有效共享令牌。建议将Nextcloud Richdocuments应用升级到3.8.4或4.2.1来解决。对于无法升级的用户，建议禁用Richdocuments应用程序。
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 < 3.8.4 -

II. Public POCs for CVE-2021-37628

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III. Intelligence Information for CVE-2021-37628

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Patches & Fixes for CVE-2021-37628 (1)

Vendor Advisories for CVE-2021-37628 (1)

Other References for CVE-2021-37628 (1)

Same Patch Batch · nextcloud · 2021-09-07 · 9 CVEs total

CVE-2021-32802 9.3 CRITICAL Preview generation used third-party library not suited for user-generated content in Nextc
CVE-2021-32800 8.1 HIGH Bypass of Two Factor Authentication in Nextcloud server
CVE-2021-37630 6.5 MEDIUM Secret Circle can be joined without approval in Nextcloud Circles
CVE-2021-37631 6.5 MEDIUM Circle can be accessed by non-Circle members in Nextcloud Deck
CVE-2021-32782 5.8 MEDIUM Cross-Site Scripting in Nextcloud Circles
CVE-2021-32801 5.5 MEDIUM Exceptions may have logged Encryption-at-Rest key content in Nextcloud server
CVE-2021-32766 5.3 MEDIUM Nextcloud Text app can disclose existence of folders in "File Drop" link share
CVE-2021-37629 5.3 MEDIUM Lack of ratelimit on Richdocuments OCS endpoint in nextcloud

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-639

V. Comments for CVE-2021-37628

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