The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading. References: https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5 https://github.com/nextcloud/desktop/pull/3338 https://hackerone.com/reports/1189162
Created nextcloud-client tracking bugs for this issue: Affects: epel-all [bug 1995586] Affects: fedora-all [bug 1995585]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.