CVE-2020-15237 : Vulnerability Insights and Analysis

In Shrine before version 3.3.0, a timing attack vulnerability exists when using the

derivation_endpoint

plugin. This CVE-2020-15237 affects Shrine versions below 3.3.0.

Understanding CVE-2020-15237

This CVE involves a timing attack vulnerability in the Shrine library.

What is CVE-2020-15237?

In Shrine versions prior to 3.3.0, attackers can exploit the

derivation_endpoint

plugin to guess the signature of the derivation URL through a timing attack.

The Impact of CVE-2020-15237

The impact of this CVE is rated as MEDIUM severity with a CVSS base score of 5.9. It has a HIGH attack complexity and affects confidentiality.

Technical Details of CVE-2020-15237

This section provides technical details of the CVE.

Vulnerability Description

The vulnerability allows attackers to perform a timing attack to guess the signature of the derivation URL.

Affected Systems and Versions

Product: Shrine
Vendor: shrinerb
Versions Affected: < 3.3.0

Exploitation Mechanism

The issue arises when using the

derivation_endpoint

plugin, enabling attackers to exploit timing discrepancies to deduce the URL signature.

Mitigation and Prevention

Protect your systems from CVE-2020-15237 with the following steps.

Immediate Steps to Take

Upgrade to Shrine version 3.3.0 or higher to mitigate the vulnerability.
Implement the provided workaround detailed in the linked advisory.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Conduct security audits and testing to identify and address potential weaknesses.

Patching and Updates

Stay informed about security updates and patches released by Shrine to address vulnerabilities like CVE-2020-15237.