CVE-2019-11269 : Exploit Details and Defense Strategies

Spring Security OAuth versions prior to 2.3.6, 2.2 prior to 2.2.5, 2.1 prior to 2.1.5, and 2.0 prior to 2.0.18 may be vulnerable to an open redirector attack leading to unauthorized disclosure of an authorization code.

Understanding CVE-2019-11269

This CVE involves a security vulnerability in Spring Security OAuth that could allow an attacker to leak authorization codes through an open redirector attack.

What is CVE-2019-11269?

CVE-2019-11269 is a vulnerability in Spring Security OAuth that could be exploited by malicious users to redirect resource owner user-agents to a URI controlled by the attacker, potentially exposing sensitive authorization codes.

The Impact of CVE-2019-11269

The vulnerability poses a medium severity risk with a CVSS base score of 4.2. It requires high privileges and user interaction, impacting confidentiality but not integrity or availability.

Technical Details of CVE-2019-11269

Spring Security OAuth is affected by an open redirector vulnerability that can be exploited as follows:

Vulnerability Description

Attackers can craft requests to the authorization endpoint using authorization code grant type
Malicious users can specify manipulated redirect URIs through the redirect_uri parameter
This can lead to unauthorized disclosure of authorization codes

Affected Systems and Versions

Spring Security OAuth versions 2.3.6, 2.2.5, 2.1.5, and 2.0.18 are affected
Unsupported older versions may also be vulnerable

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Network
Privileges Required: High
User Interaction: Required
Confidentiality Impact: High
Integrity Impact: None
Availability Impact: None

Mitigation and Prevention

To address CVE-2019-11269, consider the following steps:

Immediate Steps to Take

Upgrade Spring Security OAuth to versions 2.3.6, 2.2.5, 2.1.5, or 2.0.18
Implement input validation to prevent unauthorized redirect URIs

Long-Term Security Practices

Regularly monitor and update security patches
Conduct security audits to identify and mitigate vulnerabilities

Patching and Updates

Stay informed about security alerts and updates from Spring
Apply patches promptly to secure your systems