CVE-2023-28997

MEDIUM6.7

Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files

Published Apr 4, 2023

Modified 4 months ago

Details

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

References

WEB

https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf

WEB

https://github.com/nextcloud/desktop/pull/5324

WEB

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc

WEB

https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2023-28997

CVSS Analysis