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Nextcloud: Downgrade encryption scheme and break integrity through known-plaintext attack

🗓️ 20 Nov 2019 19:40:03Reported by yaheType 
hackerone
 hackerone
🔗 hackerone.com👁 29 Views

Nextcloud: Downgrade encryption scheme and break integrity through known-plaintext attack. Nextcloud's Server-Side Encryption scheme is vulnerable to a downgrade attack from AES-256-CTR to AES-256-CFB, allowing malicious code injection via known-plaintext attacks on encrypted files

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