CVE-2018-20744 : Exploit Details and Defense Strategies

The Olivier Poitrey Go CORS handler up to version 1.3.0 has a feature that converts a wildcard CORS policy to reflect any Origin header value, potentially leading to security issues due to misconfiguration of CORS.

Understanding CVE-2018-20744

This CVE involves a security issue in the Olivier Poitrey Go CORS handler.

What is CVE-2018-20744?

The vulnerability in the Go CORS handler allows conversion of a wildcard CORS policy to reflect any Origin header value, deviating from CORS security design.

The Impact of CVE-2018-20744

The vulnerability could result in security issues related to misconfiguration of CORS, potentially exposing sensitive data to unauthorized parties.

Technical Details of CVE-2018-20744

The technical aspects of the CVE-2018-20744 vulnerability.

Vulnerability Description

The Go CORS handler through version 1.3.0 converts a wildcard CORS policy to reflect an arbitrary Origin header value, posing security risks.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: Up to 1.3.0

Exploitation Mechanism

The vulnerability allows attackers to manipulate CORS policies, potentially leading to unauthorized access and data exposure.

Mitigation and Prevention

Ways to address and prevent the CVE-2018-20744 vulnerability.

Immediate Steps to Take

Update the Go CORS handler to a patched version that addresses the vulnerability.
Implement strict CORS policies to limit potential exploitation.

Long-Term Security Practices

Regularly monitor and update CORS configurations to ensure security.
Conduct security assessments to identify and mitigate CORS-related vulnerabilities.

Patching and Updates

Stay informed about security updates for the Go CORS handler and apply patches promptly to mitigate risks.