CVE-2021-43568 : Security Advisory and Response

Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 allows for signature forgery on arbitrary messages.

Understanding CVE-2021-43568

What is CVE-2021-43568?

The verify function in the Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 fails to verify that the signature is non-zero, enabling attackers to create forged signatures on any message.

The Impact of CVE-2021-43568

This vulnerability can lead to the forging of signatures on arbitrary messages, potentially allowing unauthorized access and malicious activities.

Technical Details of CVE-2021-43568

Vulnerability Description

The issue stems from the failure of the verify function in the library to validate non-zero signatures, facilitating signature forgery.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: 1.0.0

Exploitation Mechanism

Attackers can exploit this vulnerability to create falsified signatures on any message, potentially leading to unauthorized activities.

Mitigation and Prevention

Immediate Steps to Take

Users should update to version 1.0.1 of ecdsa-elixir or the latest secure version.
Employ alternative cryptographic libraries that provide proper signature verification.

Long-Term Security Practices

Regularly monitor for security advisories and updates from the library developers.
Conduct security audits to identify and mitigate vulnerabilities in cryptographic processes.

Patching and Updates

Apply security patches promptly to ensure the integrity of cryptographic operations and prevent signature forgeries.