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CVE-2024-58259 is a critical high-severity vulnerability impacting SUSE Rancher Manager resulting from improper resource allocation and a complete absence of request body size restrictions on specific public unauthenticated and authenticated API endpoints.
Within the vulnerable architecture, endpoints such as public `/v3-public/` routes and select internal API handlers fail to validate or truncate incoming data streams before reading them into memory.
When an unauthenticated malicious actor transmits an excessively large payload containing massive text or binary data blocks to these API routes, the application attempts to load the entire payload directly into server RAM.
Because there are no built-in size caps, throttling mechanisms, or buffer limits enforced on these specific handlers, memory consumption escalates uncontrollably during the parsing phase.
This triggers an immediate resource exhaustion condition where available system memory and CPU cycles are completely depleted by the rogue request processing routine.
Consequently, the main Rancher server process crashes, hangs, or becomes entirely unresponsive, leading to a total Denial of Service (DoS) condition that halts all cluster management capabilities.
Administrators lose access to operational controls, credential management, and monitoring dashboards across all downstream Kubernetes environments until manual service recovery or server restarts are performed.
DailyCVE Form:
Platform: Rancher Manager
Version: Prior to 2.12.1
Vulnerability: Unauthenticated Denial Service
Severity: High Severity
date: August 28 2025
Prediction: Already Patched Date
What Undercode Say:
Check Rancher server version via public settings endpoint curl -k -X GET "https://rancher.local/v3-public/settings" Send a large mock payload to test unauthenticated request size handling dd if=/dev/zero bs=1M count=100 | curl -k -X POST -H "Content-Type: application/octet-stream" --data-binary @- "https://rancher.local/v3-public/endpoint"
Exploit: (Educational Purposes!)
An adversary targets the unauthenticated public endpoints by sending HTTP POST requests packed with multi-megabyte payloads. Since the application fails to validate the content-length or restrict incoming data chunks, the backend memory buffer overflows with garbage data, crashing the service instantly.
Protection:
Upgrade Rancher Manager immediately to secure patched releases including version v2.12.1, v2.11.5, v2.10.9, or v2.9.12. Alternatively, enforce strict request body size restrictions at the reverse proxy or ingress controller layer, such as configuring NGINX ingress limits.
Impact:
Complete service outage of the Rancher management plane, interrupting global administrative access, locking out operators from managing downstream clusters, and creating high recovery overhead due to server crashes.
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Sources:
Reported By: github.com
Extra Source Hub:
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