CVE-2020-5408 : Security Advisory and Response

Spring Security versions 5.3.x prior to 5.3.2, 5.2.x prior to 5.2.4, 5.1.x prior to 5.1.10, 5.0.x prior to 5.0.16, and 4.2.x prior to 4.2.16 are affected by a vulnerability that allows a malicious user to perform a dictionary attack on encrypted data.

Understanding CVE-2020-5408

This CVE involves a security issue in Spring Security related to the use of a fixed null initialization vector with CBC Mode in the queryable text encryptor implementation.

What is CVE-2020-5408?

Spring Security versions mentioned above use a vulnerable encryption method that could enable attackers to decrypt data through a dictionary attack.

The Impact of CVE-2020-5408

The vulnerability could allow malicious actors to derive unencrypted values from encrypted data, compromising sensitive information.

Technical Details of CVE-2020-5408

Spring Security's flawed encryption implementation exposes systems to potential data decryption by unauthorized users.

Vulnerability Description

The issue stems from the use of a fixed null initialization vector with CBC Mode, making it susceptible to dictionary attacks.

Affected Systems and Versions

Spring Security 4.2.x versions prior to 4.2.16
Spring Security 5.0.x versions prior to 5.0.16
Spring Security 5.1.x versions prior to 5.1.10
Spring Security 5.2.x versions prior to 5.2.4
Spring Security 5.3.x versions prior to 5.3.2

Exploitation Mechanism

Attackers with access to encrypted data can exploit the fixed null initialization vector to decrypt information using a dictionary attack.

Mitigation and Prevention

Taking immediate action and implementing long-term security measures are crucial to safeguard systems against this vulnerability.

Immediate Steps to Take

Update Spring Security to versions 4.2.16, 5.0.16, 5.1.10, 5.2.4, or 5.3.2 to mitigate the risk.
Monitor systems for any suspicious activities that may indicate unauthorized decryption attempts.

Long-Term Security Practices

Implement strong encryption practices with random initialization vectors to enhance data security.
Regularly review and update encryption protocols to address emerging threats.

Patching and Updates

Apply patches and security updates promptly to address known vulnerabilities and enhance system security.