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The vulnerability manifests due to two critical security lapses in NeuVector’s telemetry function. First, when transmitting anonymous cluster data, the client fails to verify the TLS certificate presented by the telemetry server (upgrades.neuvector-upgrade-responder.livestock.rancher.io). This lack of certificate chain and hostname validation dismantles the trust model of TLS, permitting any server—including those controlled by an attacker—to pose as the legitimate endpoint. A man-in-the-middle attacker can exploit this to intercept, read, or alter the transmitted telemetry data in transit. Second, the mechanism that processes the server’s response reads the entire HTTP response body into memory without imposing a size limit. A malicious server, or one compromised via the first flaw, can send an infinitely large response, causing the NeuVector container to consume all available memory and crash, leading to a Denial of Service.
Platform: NeuVector
Version: <5.4.7
Vulnerability: TLS Bypass & DoS
Severity: Medium
date: 2024
Prediction: Patch available
What Undercode Say:
`curl -I -v https://upgrades.neuvector-upgrade-responder.livestock.rancher.io`
`openssl s_client -connect upgrades.neuvector-upgrade-responder.livestock.rancher.io:443`
`kubectl get deployment neuvector -o yaml | grep image`
How Exploit:
Intercept telemetry traffic.
Serve infinite HTTP response.
Exhaust container memory.
Protection from this CVE
Upgrade to v5.4.7.
Disable anonymous reporting.
Enforce network policies.
Impact:
Data Interception
Cluster DoS
Memory Exhaustion
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
