SUSE Rancher is a popular open-source platform used for managing Kubernetes clusters in production environments. It is widely used by organizations to provide a UI for cluster management, integrate with DevOps processes, and simplify the deployment and operation of containerized applications. SUSE Rancher supports projects in hybrid and multi-cloud environments, allowing users to leverage a mixture of on-premise and cloud resources. The platform is known for its ease of use, powerful features, and seamless integration with cloud-native tools, enabling developers and operations teams to deliver applications consistently across environments. Rancher is typically administered by IT teams and is often deployed in environments where large-scale Kubernetes management is essential.
This template detects a stored Cross-Site Scripting (XSS) vulnerability in SUSE Rancher that arises from an improper handling of input in its Norman API framework, specifically via the `_method` query parameter. This vulnerability allows an unauthenticated attacker to execute arbitrary scripts on users visiting the affected SUSE Rancher login page due to unsanitized user input. The threat posed by this vulnerability is critical since it involves the execution of unwanted scripts in the context of a user's session, potentially allowing for substantial exploitation. It provides an attack vector for session hijacking and could lead to the compromise of user credentials and administrative sessions within the Kubernetes clusters managed by Rancher.
Technical details of the vulnerability indicate that the XSS route is through the alteration of the `ui-pl` settings parameter using HTTP method override with PUT requests. Typically, the affected endpoint is the login page located at `/dashboard/auth/login`, where the vulnerability results from rendering dynamic content without input sanitization. An attacker can use this entry to embed malicious JavaScript code, which remains persistent and gets executed when unwary users visit the page. The critical aspect of the attack is its use of public UI settings, which were meant to be immutable by unauthenticated users, leveraging the willingness of the system to override methods via query parameter manipulation.
If exploited, this vulnerability could lead to several possible effects, including unauthorized administrative access to the SUSE Rancher environment. Malicious actors could hijack administrator sessions, retrieve or alter sensitive configuration data, steal session tokens, or fully control the linked Kubernetes clusters. Such exploitation can severely undermine the entire security posture of the cloud-native application infrastructure managed by SUSE Rancher, possibly facilitating lateral movement within networks and leading to a further system compromise.
REFERENCES
- Update SUSE Rancher to at least version 2.15.2, 2.14.6, 2.13.10, 2.12.14, or 2.11.18 to fix the vulnerability.
- Audit all public UI settings for unexpected values and adjust them if necessary to enhance security.
- Immediately rotate the administrator password and revoke existing admin sessions to minimize potential exposure.
- Enable monitoring of suspicious activity around the login page and other interfaces susceptible to XSS attacks.
- Implement additional layers of input validation and sanitization policies to prevent similar vulnerabilities in the future.
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