Vulnerability CVE-2021-37628
Published: 2021-09-07

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.

Type:

CWE-639

 (Authorization Bypass Through User-Controlled Key)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Nextcloud -> Richdocuments 

 References:
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w
https://hackerone.com/reports/1253403
https://github.com/nextcloud/richdocuments/pull/1664
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