Downgrade encryption scheme and break integrity through known-plaintext attack (NC-SA-2020-039)
26th August 2020
Risk level: Low
CVSS v3 Base Score: 5.3 (AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N)
CWE: Cryptographic Issues - Generic (CWE-310)
HackerOne report: 742588
Description
A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.
Affected Software
- Nextcloud Server < 19.0.2 (CVE-2020-8150)
Action Taken
The error has been fixed.
Resolution
It is recommended that the Nextcloud Server is upgraded to 19.0.2.
Acknowledgements
The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:
This advisory is licensed CC BY-SA 4.0.