CVE-2019-9837 : Vulnerability Insights and Analysis

The OpenID Connect extension for Doorkeeper, specifically versions 1.4.x and 1.5.x before 1.5.4, has a vulnerability that allows an open redirect, potentially leading to phishing attacks.

Understanding CVE-2019-9837

This CVE involves a security vulnerability in the OpenID Connect extension for Doorkeeper, allowing malicious actors to exploit an open redirect flaw.

What is CVE-2019-9837?

The vulnerability in versions 1.4.x and 1.5.x before 1.5.4 enables an open redirect when the redirect_uri field is used in an OAuth authorization request with specific parameters, making it susceptible to phishing attacks.

The Impact of CVE-2019-9837

The vulnerability allows threat actors to launch phishing attacks during the authorization flow, potentially compromising user credentials and sensitive information.

Technical Details of CVE-2019-9837

The technical aspects of the CVE provide insight into the specific vulnerability and its implications.

Vulnerability Description

The vulnerability in Doorkeeper::OpenidConnect allows an open redirect via the redirect_uri field in an OAuth authorization request, facilitating phishing attacks against the authorization flow.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: 1.4.x and 1.5.x before 1.5.4

Exploitation Mechanism

The vulnerability occurs when the redirect_uri field is utilized in an OAuth authorization request with the 'openid' scope and a prompt=none value, resulting in an error response that can be exploited by malicious actors.

Mitigation and Prevention

Addressing the CVE involves taking immediate steps and implementing long-term security practices to mitigate risks.

Immediate Steps to Take

Update Doorkeeper::OpenidConnect to version 1.5.4 or later to patch the vulnerability.
Monitor authorization flows for any suspicious activity.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Educate users and administrators about phishing attacks and best practices for secure authorization.
Implement multi-factor authentication to enhance security.
Conduct security audits and assessments regularly.

Patching and Updates

Ensure that all systems running Doorkeeper::OpenidConnect are updated to version 1.5.4 or above to eliminate the vulnerability and enhance security measures.