CVE-2020-8173 : Security Advisory and Response

Nextcloud Server 18.0.4 uses a too small set of random characters for encryption, allowing for quicker decryption than intended.

Understanding CVE-2020-8173

A vulnerability in Nextcloud Server 18.0.4 due to insufficient randomness in encryption keys.

What is CVE-2020-8173?

This CVE identifies a cryptographic issue in Nextcloud Server version 18.0.4, where the encryption process uses a limited set of random characters, making decryption faster than expected.

The Impact of CVE-2020-8173

The vulnerability could potentially compromise the confidentiality of encrypted data stored on Nextcloud Server 18.0.4.

Technical Details of CVE-2020-8173

The specifics of the vulnerability in Nextcloud Server 18.0.4.

Vulnerability Description

Insufficient randomness in encryption keys
Faster decryption due to a limited set of random characters

Affected Systems and Versions

Product: Nextcloud Server
Version: 18.0.4

Exploitation Mechanism

Attackers could exploit the weak encryption to decrypt sensitive data more easily than intended.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-8173 vulnerability.

Immediate Steps to Take

Upgrade Nextcloud Server to a patched version
Monitor for any unauthorized access or data breaches

Long-Term Security Practices

Implement strong encryption practices
Regularly update and patch software to address security vulnerabilities

Patching and Updates

Apply security patches provided by Nextcloud to fix the encryption weakness