Overview
A critical security vulnerability, designated as CVE-2024-58259, has been identified in Rancher Manager, a widely-used open-source tool for managing Kubernetes clusters. This vulnerability can potentially impact any organization or individual that uses Rancher Manager in their infrastructure. It is of particular concern due to the potential for a Denial of Service (DoS) attack, which could lead to system compromise or data leakage, hence, the need for immediate attention cannot be overstated.
Vulnerability Summary
CVE ID: CVE-2024-58259
Severity: High (CVSS: 8.2)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise, or data leakage
Affected Products
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Product | Affected Versions
Rancher Manager | All versions prior to the patch
How the Exploit Works
The vulnerability lies in Rancher Manager’s lack of enforcement of request body size limits on certain public and authenticated API endpoints. A malicious user could exploit this by sending excessively large payloads, which are fully loaded into memory during processing. This could overload the system’s resources, leading to a Denail of Service (DoS) attack. In worst-case scenarios, this could even lead to potential system compromise or data leakage.
Conceptual Example Code
Here is a conceptual example of how this vulnerability might be exploited. This example shows a malicious payload being sent to a vulnerable endpoint:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"malicious_payload": "[Payload of excessive size]"
}In this scenario, the malicious payload is of excessive size, which when processed by the server, leads to resource exhaustion and potential DoS.
Mitigation
To mitigate this vulnerability, users are advised to apply the latest patch from the vendor. If a patch is not available, users might consider using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary solution. These tools can limit the size of incoming payloads, therefore, providing some level of protection against this exploit.
Remember, staying updated with the latest patches and security recommendations is one of the most effective ways to ensure the security of your systems.
