VulnerabilityModified

CVE-2018-5256

HIGH 7.5EPSS 1.67%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CoreOS Tectonic 1.7.x before 1.7.9-tectonic.4 and 1.8.x before 1.8.4-tectonic.3 mounts a direct proxy to the kubernetes cluster at /api/kubernetes/ which is accessible without authentication to Tectonic and allows an attacker to directly connect to the kubernetes API server. Unauthenticated users are able to list all Namespaces through the Console, resulting in an information disclosure. Tectonic's exposure of an unauthenticated API endpoint containing information regarding the internal state of the cluster can provide an attacker with information that may assist in other attacks against the cluster. For example, an attacker may not have the permissions required to list all namespaces in the cluster but can instead leverage this vulnerability to enumerate the namespaces and then begin to check each namespace for weak authorization policies that may allow further escalation of privileges.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 1.67% probability · 75th percentile
CISA KEV: Not listed
Weakness: CWE-200
Affected: redhat/tectonic
Source: cve@mitre.org

References

https://coreos.com/blog/tectonic-namespace-information-disclosure-vulnerability-patchedVendor Advisory
https://coreos.com/tectonic/releases/#1.8.4-tectonic.3Release Notes, Vendor Advisory
https://coreos.com/blog/tectonic-namespace-information-disclosure-vulnerability-patchedVendor Advisory
https://coreos.com/tectonic/releases/#1.8.4-tectonic.3Release Notes, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.