PT-2021-22474 · Nextcloud · Nextcloud Richdocuments

Lukas Reschke · Published 2021-10-25 · Updated 2021-10-29 · CVE-2021-39223

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud Richdocuments versions prior to 3.8.6 and 4.2.3

Description The Nextcloud Richdocuments application returned verbatim exception messages to the user, which could result in a full path disclosure on shared files. For example, an attacker could see that the file shared.txt is located within /files/$username/Myfolder/Mysubfolder/shared.txt.

Recommendations For versions prior to 3.8.6, upgrade to version 3.8.6. For versions prior to 4.2.3, upgrade to version 4.2.3. As a temporary workaround, consider disabling the Richdocuments application in the app settings.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2021-39223

GHSA-RJCC-4CGJ-6V93

Affected Products

Nextcloud Richdocuments

References · 7

• https://github.com/nextcloud/richdocuments/pull/1760 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-39223 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39223 · Vendor Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93 · Note
• https://t.me/cibsecurity/31188 · Telegram Post
• https://hackerone.com/reports/1253460 · Note
• https://t.me/cvenotify/22397 · Telegram Post