CVE-2018-5256 Missing authorization in n/a

What is CVE-2018-5256?

CVE-2018-5256 is a high-severity missing authorization vulnerability in n/a, published on 18 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-200

Which versions are affected by CVE-2018-5256?

It affects 1 product.

Products include Redhat Tectonic.

How do I fix CVE-2018-5256?

No fix has been published for CVE-2018-5256 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-5256 being exploited?

There is no known exploitation of CVE-2018-5256 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2018-9090 Cross-site scripting in n/a Medium 6.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2jqj-xw9v-qv9j.