Vulnerability Details : CVE-2021-32766
Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case the public link share has been created with "Upload Only" privileges. (aka "File Drop"). A link share recipient is not expected to see which folders or files exist in a "File Drop" share. Using this vulnerability an attacker is able to enumerate folders in such a share. Exploitation requires that the attacker has access to a valid affected "File Drop" link share. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.0.1. Users who are unable to upgrade are advised to disable the Nextcloud Text application in the app settings.
Products affected by CVE-2021-32766
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-32766
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 36 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-32766
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
GitHub, Inc. |
CWE ids for CVE-2021-32766
-
The product generates an error message that includes sensitive information about its environment, users, or associated data.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2021-32766
-
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3wmc-88jr
Nextcloud Text app can disclose existence of folders in "File Drop" link share · Advisory · nextcloud/security-advisories · GitHubThird Party Advisory
-
https://hackerone.com/reports/1253475
Sign inPermissions Required;Third Party Advisory
-
https://github.com/nextcloud/text/pull/1716
Unify error responses and add logging where appropriate by juliushaertl · Pull Request #1716 · nextcloud/text · GitHubPatch;Third Party Advisory
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