CVE-2017-12158 : Security Advisory and Response
Discover the impact of CVE-2017-12158, a Keycloak vulnerability allowing a reflected XSS attack. Learn about affected systems, exploitation, and mitigation steps.
Keycloak vulnerability allowing reflected XSS attack.
Understanding CVE-2017-12158
A security flaw in Keycloak could be exploited by a malicious server to launch a reflected XSS attack.
What is CVE-2017-12158?
- Discovered on October 17, 2017, CVE-2017-12158 is a vulnerability in Keycloak's admin console that allows the acceptance of a HOST header URL to determine web resource locations.
- This vulnerability could be leveraged by a malicious server to execute a reflected XSS attack against authenticated users.
The Impact of CVE-2017-12158
- An attacker could exploit this vulnerability to trick authenticated users into executing malicious scripts unknowingly.
- Successful exploitation could lead to unauthorized access to sensitive information or actions on the affected system.
Technical Details of CVE-2017-12158
Keycloak vulnerability details.
Vulnerability Description
- Keycloak's admin console vulnerability allows the acceptance of a HOST header URL to locate web resources.
- This flaw enables a malicious server to launch a reflected XSS attack against authenticated users.
Affected Systems and Versions
- Product: Keycloak
- Vendor: Red Hat, Inc.
- Version: 3.4.0
Exploitation Mechanism
- A malicious server can exploit the vulnerability by sending a crafted HOST header URL to the admin console, tricking authenticated users into executing malicious scripts.
Mitigation and Prevention
Protecting against CVE-2017-12158.
Immediate Steps to Take
- Apply security patches provided by Red Hat to address the vulnerability.
- Monitor and restrict the input validation for HOST header URLs in Keycloak.
- Educate users about the risks of executing scripts from untrusted sources.
Long-Term Security Practices
- Regularly update Keycloak and other software components to mitigate potential vulnerabilities.
- Implement strict security controls and best practices to prevent XSS attacks.
Patching and Updates
- Red Hat has released security advisories (RHSA-2017:2904, RHSA-2017:2905, RHSA-2017:2906) containing patches to fix the vulnerability in Keycloak.