CVE-2020-10706
Description
A flaw was found in OpenShift Container Platform where OAuth tokens are not encrypted when the encryption of data at rest is enabled. This flaw allows an attacker with access to a backup to obtain OAuth tokens and then use them to log into the cluster as any user who logged into the cluster via the WebUI or via the command line in the last 24 hours. Once the backup is older than 24 hours the OAuth tokens are no longer valid.
Statement
This issue only affects OpenShift Container Platform when the 'encryption at rest' feature enabled, see https://access.redhat.com/documentation/en-us/openshift_container_platform/4.3/html/authentication/encrypting-etcd. When backing up the encrypted data the keys should be stored separately to the data, making backups the most likely target of this attack.
Mitigation
If you have made a vulnerable backup public you can revoke leaked OAuth tokens by deleting them with the OpenShift API.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 6.6 | N/A |
| Attack Vector | Physical | Physical | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
An attacker with access to the system could read sensitive information stored in cleartext (i.e., unencrypted). Even if the information is encoded in a way that is not human-readable, certain techniques could determine which encoding is being used, then decode the information.
Acknowledgements
This issue was discovered by Stefan Schimanski (Red Hat).
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