Input validation error in Kubernetes - CVE-2021-25735

Vulnerability identifier: #VU56245

CSH Severity: Medium

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-25735

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in kube-apiserver that could allow Node updates to bypass a Validating Admission Webhook. An authenticated user could exploit this by modifying Node properties to values that should have been prevented by registered admission webhooks.

Kubernetes
Red Hat OpenShift Container Platform
Migration Toolkit for Containers
openEuler
toolbox (Red Hat package)
coreos-installer (Red Hat package)
python-openshift (Red Hat package)
butane (Red Hat package)
python-pyrsistent (Red Hat package)
console-login-helper-messages (Red Hat package)
python-eventlet (Red Hat package)
python-hardware (Red Hat package)
python-openstacksdk (Red Hat package)
runc (Red Hat package)
python-oslo-upgradecheck (Red Hat package)
rteval-loads (Red Hat package)
kubernetes
kubernetes-kubelet
kubernetes-client
kubernetes-node
kubernetes-master
kubernetes-help
kubernetes-kubeadm
cri-tools (Red Hat package)
cri-o (Red Hat package)
python-sushy-oem-idrac (Red Hat package)
kata-containers (Red Hat package)
python-debtcollector (Red Hat package)
python-ironic-prometheus-exporter (Red Hat package)
haproxy (Red Hat package)
python-oslo-service (Red Hat package)
python-tooz (Red Hat package)
ignition (Red Hat package)
openvswitch2.15 (Red Hat package)
jenkins (Red Hat package)
podman (Red Hat package)
python-oslo-context (Red Hat package)
python-jsonschema (Red Hat package)
python-stevedore (Red Hat package)
python-oslo-policy (Red Hat package)
python-sushy (Red Hat package)
python-oslo-serialization (Red Hat package)
python-keystoneauth1 (Red Hat package)
python-oslo-concurrency (Red Hat package)
python-oslo-log (Red Hat package)
python-ironic-lib (Red Hat package)
python-oslo-utils (Red Hat package)
openshift-kuryr (Red Hat package)
atomic-openshift-service-idler (Red Hat package)
openshift-ansible (Red Hat package)
openshift-clients (Red Hat package)
openshift (Red Hat package)
jenkins-2-plugins (Red Hat package)
rust-afterburn (Red Hat package)
python-oslo-i18n (Red Hat package)
openstack-ironic-python-agent (Red Hat package)
python-oslo-db (Red Hat package)
python-oslo-config (Red Hat package)
openstack-ironic-inspector (Red Hat package)
python-kubernetes (Red Hat package)
openstack-ironic (Red Hat package)
ovn2.13 (Red Hat package)
redhat-release-coreos (Red Hat package)
ostree (Red Hat package)
ironic-images (Red Hat package)
IBM Cloud Pak for Watson AIOps
Robotic Process Automation for Cloud Pak

Install updates from vendor's website.

Kubernetes - addressed in versions 1.18.18, 1.19.10, 1.20.6
Red Hat OpenShift Container Platform - addressed in versions 4.8.2, 4.10.30
toolbox (Red Hat package) - update to 0.0.8-3.rhaos4.8.el8
coreos-installer (Red Hat package) - update to 0.9.0-6.rhaos4.8.el8
python-openshift (Red Hat package) - update to 0.12.1-1.el8
butane (Red Hat package) - update to 0.12.1-1.rhaos4.8.el8
python-pyrsistent (Red Hat package) - update to 0.16.0-3.el8ost
console-login-helper-messages (Red Hat package) - update to 0.20.3-1.rhaos4.8.el8
python-eventlet (Red Hat package) - update to 0.25.2-4.el8
python-hardware (Red Hat package) - update to 0.27.0-0.20210406121246.756fedb.el8
python-openstacksdk (Red Hat package) - update to 0.53.0-0.20210325011601.4629245.el8
runc (Red Hat package) - addressed in versions 1.0.0-98.rhaos4.8.gitcd80260.el7, 1.0.0-98.rhaos4.8.gitcd80260.el8
python-oslo-upgradecheck (Red Hat package) - update to 1.3.0-0.20210325003851.9f95a6e.el8
rteval-loads (Red Hat package) - update to 1.4-12.el8
Migration Toolkit for Containers - update to 1.5.1
kubernetes - update to 1.20.2-5
kubernetes-kubelet - update to 1.20.2-5
kubernetes-client - update to 1.20.2-5
kubernetes-node - update to 1.20.2-5
kubernetes-master - update to 1.20.2-5
kubernetes-help - update to 1.20.2-5
kubernetes-kubeadm - update to 1.20.2-5
cri-tools (Red Hat package) - addressed in versions 1.21.0-2.el7, 1.21.0-2.el8
cri-o (Red Hat package) - addressed in versions 1.21.2-5.rhaos4.8.gitb27d974.el7, 1.21.2-5.rhaos4.8.gitb27d974.el8
python-sushy-oem-idrac (Red Hat package) - update to 2.0.1-0.20210326152858.83b7eb0.el8
kata-containers (Red Hat package) - update to 2.1.0-4.el8
python-debtcollector (Red Hat package) - update to 2.2.0-0.20210324220630.649189d.el8
python-ironic-prometheus-exporter (Red Hat package) - update to 2.2.1-0.20210325143713.70e39c8.el8
haproxy (Red Hat package) - addressed in versions 2.2.13-1.el7, 2.2.13-1.el8
python-oslo-service (Red Hat package) - update to 2.5.0-0.20210325014731.d25e454.el8
python-tooz (Red Hat package) - update to 2.8.0-0.20210324235001.54448e9.el8
ignition (Red Hat package) - update to 2.9.0-6.rhaos4.8.el8
openvswitch2.15 (Red Hat package) - update to 2.15.0-9.el8fdp
jenkins (Red Hat package) - update to 2.289.1.1624020353-1.el8
podman (Red Hat package) - update to 3.0.1-6.el8
python-oslo-context (Red Hat package) - update to 3.2.0-0.20210325043103.0d02866.el8
python-jsonschema (Red Hat package) - update to 3.2.0-5.el8ost
python-stevedore (Red Hat package) - update to 3.3.0-0.20210325001012.7d7154f.el8
python-oslo-policy (Red Hat package) - update to 3.7.0-0.20210325051823.d853485.el8
python-sushy (Red Hat package) - update to 3.7.1-0.20210428165244.bc49878.el8
python-oslo-serialization (Red Hat package) - update to 4.1.0-0.20210325012242.8445e61.el8
python-keystoneauth1 (Red Hat package) - update to 4.3.0-0.20210325001456.6a66271.el8
python-oslo-concurrency (Red Hat package) - update to 4.4.0-0.20210325004915.7dcf9e9.el8
python-oslo-log (Red Hat package) - update to 4.4.0-0.20210409081224.9b29c90.el8
python-ironic-lib (Red Hat package) - update to 4.6.2-0.20210608101214.ca2e4ba.el8
python-oslo-utils (Red Hat package) - update to 4.8.0-0.20210325043201.3288539.el8
openshift-kuryr (Red Hat package) - update to 4.8.0-202106281541.p0.git.8a4c2d8.assembly.stream.el8
atomic-openshift-service-idler (Red Hat package) - update to 4.8.0-202106281541.p0.git.39cfc66.assembly.stream.el8
openshift-ansible (Red Hat package) - update to 4.8.0-202106281541.p0.git.626f7a3.assembly.stream.el7
openshift-clients (Red Hat package) - addressed in versions 4.8.0-202106281541.p0.git.1077b05.assembly.stream.el7, 4.8.0-202106281541.p0.git.1077b05.assembly.stream.el8
openshift (Red Hat package) - addressed in versions 4.8.0-202107161820.p0.git.051ac4f.assembly.stream.el7, 4.8.0-202107161820.p0.git.051ac4f.assembly.stream.el8
IBM Cloud Pak for Watson AIOps - update to 4.8.1
jenkins-2-plugins (Red Hat package) - update to 4.8.1624022417-1.el8
rust-afterburn (Red Hat package) - update to 5.0.0-1.rhaos4.8.el8
python-oslo-i18n (Red Hat package) - update to 5.0.1-0.20210324221600.73187bd.el8
openstack-ironic-python-agent (Red Hat package) - update to 7.0.2-0.20210611153100.bfa97cb.el8
python-oslo-db (Red Hat package) - update to 8.5.0-0.20210325041241.503db60.el8
python-oslo-config (Red Hat package) - update to 8.5.0-0.20210325050501.cfa2564.el8
openstack-ironic-inspector (Red Hat package) - update to 10.6.1-0.20210406091336.579f59c.el8
python-kubernetes (Red Hat package) - update to 12.0.1-1.el8
openstack-ironic (Red Hat package) - update to 17.0.4-0.20210713221218.a415e7e.el8
ovn2.13 (Red Hat package) - update to 20.12.0-25.el8fdp
Robotic Process Automation for Cloud Pak - update to 21.0.7.3
redhat-release-coreos (Red Hat package) - update to 48.84-4.el8
ostree (Red Hat package) - update to 2020.7-5.el8_4
ironic-images (Red Hat package) - update to 2021.1-20210614.1.el8

• Exploit #6728 - CVE-2021-25735 (Exploit CVE-2021-25735: Kubernetes Validating Admission Webhook Bypass) (September 12, 2021)

• https://github.com/kubernetes/kubernetes/issues/100096
• https://bugzilla.redhat.com/show_bug.cgi?id=1937562

• Input validation error in Kubernetes
• Multiple vulnerabilities in Red Hat Migration Toolkit for Containers
• Multiple vulnerabilities in OpenShift Container Platform 4.10
• Input validation error in IBM Robotic Process Automation for Cloud Pak
• openEuler update for kubernetes
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.8 packages
• Multiple vulnerabilities in IBM Cloud Pak for AIOps