CVE-2018-5382 : Vulnerability Insights and Analysis

By default, the BKS keystore utilizes a 16-bit HMAC (Hash-based Message Authentication Code), potentially compromising its integrity. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2018-5382

Bouncy Castle BKS-V1 keystore files are vulnerable to trivial hash collisions.

What is CVE-2018-5382?

The Bouncy Castle library's BKS keystore uses a 16-bit HMAC, which can compromise the keystore's integrity. Version 1.47 introduced a 160-bit HMAC format to address this issue.

The Impact of CVE-2018-5382

Vulnerability in BKS keystore integrity due to a 16-bit HMAC
Risk of trivial hash collisions

Technical Details of CVE-2018-5382

Bouncy Castle BKS-V1 keystore files are susceptible to hash collisions.

Vulnerability Description

Default BKS keystore uses a 16-bit HMAC
Release 1.47 upgraded to a 160-bit HMAC

Affected Systems and Versions

Product: Bouncy Castle
Vendor: Legion of the Bouncy Castle
Versions affected: < 1.47

Exploitation Mechanism

Attackers can compromise keystore integrity through trivial hash collisions

Mitigation and Prevention

Immediate Steps to Take:

Update to Bouncy Castle version 1.47 or higher
Avoid using the "BKS-V1" keystore type unless necessary Long-Term Security Practices:
Regularly update cryptographic libraries
Implement strong cryptographic algorithms
Conduct security assessments and audits
Educate developers on secure coding practices

Patching and Updates

Apply patches provided by Bouncy Castle
Monitor for security advisories and updates from the vendor