CVE-2020-15257
Description
A flaw was found in containerd. Access controls for the shim's API socket verified that a connecting process had an effective UID of 0, but otherwise did not restrict access to the abstract Unix domain socket. This could allow malicious containers running in the same network namespace as the shim, with an effective UID of 0 but otherwise reduced privileges, to cause new processes to be run with elevated privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Statement
The container runtime in OpenShift Container Platform 4 is cri-o which is not affected by this flaw. It doesn't make use of abstract unix sockets like containerd, which lead to this vulnerability being possible.
Red Hat Advanced Cluster Management for Kubernetes is not affected by this flaw. While containerd is included in the multicloud-operators-subscription image as a dependency of helm, it is not used in any way that exposes the abstract unix socket that is involved in this vulnerability.
The container-tools module in Red Hat Enterprise Linux is not affected by this flaw as these packages do not use abstract unix sockets for container management.
For Red Hat OpenStack Platform, because containerd is not actually used in director-operator, the RHOSP Impact has been moved to Low.
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 | 8.8 | 5.2 | N/A |
| Attack Vector | Network | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Changed | N/A |
| Confidentiality | High | Low | N/A |
| Integrity Impact | High | Low | N/A |
| Availability Impact | High | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
