End-to-end encryption device setup did not verify public key
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-32727US | high7.5 | — | ||
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/nextcloud/android/pull/8438ADVISORY
- https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devicesADVISORY
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736ADVISORY
- https://hackerone.com/reports/1189162WEB
- https://nvd.nist.gov/vuln/detail/CVE-2021-32727WEB
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