CVE-2020-1728 in KeyCloak
Summary
by MITRE
A vulnerability was found in all versions of Keycloak where, the pages on the Admin Console area of the application are completely missing general HTTP security headers in HTTP-responses. This does not directly lead to a security issue, yet it might aid attackers in their efforts to exploit other problems. The flaws unnecessarily make the servers more prone to Clickjacking, channel downgrade attacks and other similar client-based attack vectors.
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Analysis
by VulDB Data Team • 05/17/2024
The vulnerability identified as CVE-2020-1728 represents a significant security oversight in Keycloak versions prior to 11.0.0 where the administrative console fails to implement essential HTTP security headers. This weakness exists across all affected versions and specifically impacts the admin console area of the application. The absence of proper security headers creates an environment where attackers can more easily exploit other potential vulnerabilities that may exist within the system. While this particular flaw does not directly compromise authentication or authorization mechanisms, it creates favorable conditions for various client-side attack vectors that could be leveraged by malicious actors to escalate their attacks. The vulnerability aligns with CWE-693, which addresses protection mechanism failures, and represents a failure to implement proper security controls at the HTTP response layer. Organizations using Keycloak without these security headers are essentially providing attackers with a more accessible attack surface that could facilitate the exploitation of additional weaknesses.
The technical implementation of this vulnerability stems from Keycloak's default configuration where the admin console responses do not include critical security headers such as X-Frame-Options, Content-Security-Policy, X-Content-Type-Options, and Strict-Transport-Security. These headers serve as fundamental defenses against various attack patterns including clickjacking, cross-site scripting, and protocol downgrade attacks. The missing headers create a dangerous environment where an attacker could potentially frame the admin console within a malicious website, tricking administrators into performing unintended actions. Additionally, the lack of proper content-type options and security policies leaves the application vulnerable to MIME type confusion attacks and other client-side exploits. The vulnerability directly relates to ATT&CK technique T1566, which involves social engineering through the manipulation of web content and user interactions. The absence of these headers essentially removes the application's ability to provide basic client-side protection mechanisms that are standard practice in modern web application security.
The operational impact of CVE-2020-1728 extends beyond the immediate security implications, as it creates a foundation for more sophisticated attacks that could compromise the entire Keycloak deployment. When administrators access the admin console without proper security headers, they become vulnerable to clickjacking attacks where malicious actors can overlay transparent elements on top of legitimate admin interfaces, potentially capturing credentials or performing unauthorized administrative actions. The vulnerability also makes the system more susceptible to man-in-the-middle attacks through protocol downgrade scenarios, as the lack of HSTS headers removes protection against SSL stripping attacks. Organizations may experience increased risk of successful exploitation of other vulnerabilities that might exist in the same deployment, as the missing security headers provide attackers with additional attack vectors to consider. This vulnerability is particularly concerning in enterprise environments where Keycloak serves as a central authentication and authorization service, as compromising the admin console could provide attackers with elevated privileges to manipulate user access, modify authentication policies, and potentially gain access to sensitive backend systems.
Mitigation strategies for CVE-2020-1728 require both immediate and long-term approaches to address the missing security headers. The most effective immediate solution involves upgrading to Keycloak version 11.0.0 or later, where the security headers are properly implemented in the admin console responses. Organizations should also implement reverse proxy configurations that enforce the necessary security headers for all admin console endpoints, particularly X-Frame-Options to prevent clickjacking, Content-Security-Policy to restrict content sources, and X-Content-Type-Options to prevent MIME type confusion. Network-level controls such as web application firewalls should be configured to automatically inject missing security headers into responses from the Keycloak admin console. Additionally, organizations should conduct comprehensive security audits to identify all instances of the vulnerable Keycloak versions and ensure that proper header implementation is enforced through configuration management practices. The implementation of these mitigations should follow security standards such as those outlined in NIST SP 800-53 and ISO/IEC 27001, ensuring that HTTP security headers are consistently applied across all application components. Regular security testing and monitoring should be implemented to verify that the security headers remain properly configured and that no regressions occur in the security posture of the Keycloak deployment.