Description Preview
Overview
Keycloak is an open-source identity and access management solution. This vulnerability affects the SAML Single Logout (SLO) functionality within Keycloak. When a malicious actor sends a specially crafted SAML Logout request with Extensions placed in a specific position within the request structure, the parsing mechanism enters an infinite loop. This consumes server resources and can lead to a denial of service condition, making the authentication service unavailable to legitimate users. The vulnerability is particularly concerning in environments where Keycloak serves as a central authentication point for multiple applications.
Remediation
The recommended remediation is to upgrade Keycloak to version 2.5.5 or later, which contains a fix for this vulnerability. If immediate upgrading is not possible, consider implementing the following temporary mitigations:
- Deploy a Web Application Firewall (WAF) to filter potentially malicious SAML requests
- Monitor server resource usage for unusual spikes that might indicate exploitation attempts
- Implement rate limiting for authentication endpoints to reduce the impact of potential attacks
- Consider implementing network-level protection to block suspicious traffic patterns targeting SAML endpoints
References
- Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2646
- SecurityFocus: http://www.securityfocus.com/bid/96882
- Common Weakness Enumeration: CWE-835 (Infinite Loop)
- Keycloak Security Advisories: Check the official Keycloak documentation for additional security information
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- Transportation & WarehousingTransportation & Warehousing
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- ConstructionConstruction
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Health Care & Social AssistanceHealth Care & Social Assistance
- InformationInformation
- ManufacturingManufacturing
- MiningMining
- Other Services (except Public Administration)Other Services (except Public Administration)
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Public AdministrationPublic Administration
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- UtilitiesUtilities
- Wholesale TradeWholesale Trade