Vulnerability · Published Oct 25, 2021 · Assigned by GitHub_M

CVE-2021-39224File path disclosure of shared files in OfficeOnline application

Low 3.5

In plain English

A low-severity information exposure in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)3.5Low

Exploit odds (30 days)0.9%top 40.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 1.1.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56wm-r6jm-3v9h x_refsource_CONFIRM
https://github.com/nextcloud/officeonline/pull/204 x_refsource_MISC