CVE-2019-11248
Description
From CVE.org
The debugging endpoint /debug/pprof is exposed over the unauthenticated Kubelet healthz port. The go pprof endpoint is exposed over the Kubelet's healthz port. This debugging endpoint can potentially leak sensitive information such as internal Kubelet memory addresses and configuration, or for limited denial of service. Versions prior to 1.15.0, 1.14.4, 1.13.8, and 1.12.10 are affected. The issue is of medium severity, but not exposed by the default configuration.
Statement
OpenShift Container Platform 3 is not vulnerable to this flaw as the kubelet healthz server is disabled by default. OpenShift Container Platform 4 enables the /debug/pprof endpoint on the kubelet healthz server to local traffic only. There are multiple reasons why this has been rated as moderate by Red Hat.
- Firstly, even though the endpoint is vulnerable, not all Kubernetes deployments expose the healthz /debug/pprof interface to untrusted networks. Many use network policies or restrict that port to internal or localhost. SUSE’s advisory explicitly notes that the debugging endpoint “is not exposed by the default configuration.”
- While the biggest impact is confidentiality, theoretical leakage of internal state or memory, there is no integrity or full service takeover.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | 8.2 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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