A privilege escalation flaw was found in openshift4/ose-docker-builder.
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-552.
Summary
A privilege escalation flaw was found in openshift4/ose-docker-builder. The build container runs with high privileges using a chrooted environment instead of runc. If an attacker can gain access to this build container, they can potentially utilize the raw devices of the underlying node, such as the network and storage devices, to at least escalate their privileges to that of the cluster admin. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | openshift | github.com/openshift/builder v0.0.0-20210118193943-6d10f5202a76 | — | No fix listed | CNA |
- openshift Vendor— Affected github.com/openshift/builder v0.0.0-20210118193943-6d10f5202a76 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:* | 4.4 to before 4.4.33; 4.5 to before 4.5.30; 4.6 to before 4.6.15 | Vulnerable | Red Hat |
- cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:* Versions 4.4 to before 4.4.33; 4.5 to before 4.5.30; 4.6 to before 4.6.15 Vulnerable ·Red Hat
Remediation
Red Hat 1 advisory
- RHSA-2021:0281 Released 2021-02-03 · Red Hat rating ImportantOpenShift Container Platform 4.4.33 bug fix and security update
- Red Hat OpenShift Container Platform 4.4 openshift4/ose-aws-machine-controllers, openshift4/ose-azure-machine-controllers, openshift4/ose-baremetal-machine-controllers +47
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 4.4 | Fixed | RHSA-2021:0281 |
| Red Hat OpenShift Container Platform 4.5 | Fixed | — |
| Red Hat OpenShift Container Platform 4.6 | Fixed | — |
Not affected: 2 products
- Red Hat OpenShift Container Platform 3.11
- Red Hat OpenShift Container Platform 4.5
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20182
References
More Red Hat Openshift Container Platform vulnerabilities
- TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
- TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
- TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
- TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
- TI-2026-34021 Linux kernel skb coalescing drops shared-frag marker KEVCVSS 3.1HIGH 7.8
- TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2021-20182 · CVE Program
- CVE-2021-20182 · NVD
- FIRST EPSS
- CVE-2021-20182 · Red Hat security data · CC BY 4.0
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