Incorrect default permissions in Installer for CoreOS disk images - CVE-2021-3917

Vulnerability identifier: #VU58460

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-3917

CWE-ID: CWE-276

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions on the "/boot/ignition{,/config.ign}". A local user with access to the system can view contents of files and directories or modify them.

Installer for CoreOS disk images
Red Hat OpenShift Container Platform
coreos-installer (Red Hat package)
cri-o (Red Hat package)
jenkins (Red Hat package)
python-sushy (Red Hat package)
openshift-kuryr (Red Hat package)
openshift (Red Hat package)
jenkins-2-plugins (Red Hat package)

Install updates from vendor's website.

Installer for CoreOS disk images - update to 0.10.0
coreos-installer (Red Hat package) - update to 0.9.0-8.rhaos4.8.el8
cri-o (Red Hat package) - addressed in versions 1.21.4-3.rhaos4.8.git84fa55d.el7, 1.21.4-3.rhaos4.8.git84fa55d.el8
jenkins (Red Hat package) - update to 2.303.3.1637596565-1.el8
python-sushy (Red Hat package) - update to 3.7.4-0.20211119091058.2cc60dc.el8
Red Hat OpenShift Container Platform - update to 4.8.22
openshift-kuryr (Red Hat package) - update to 4.8.0-202111221627.p0.g43dd2f6.assembly.stream.el8
openshift (Red Hat package) - addressed in versions 4.8.0-202111221934.p0.g81bc627.assembly.stream.el7, 4.8.0-202111221934.p0.g81bc627.assembly.stream.el8
jenkins-2-plugins (Red Hat package) - update to 4.8.1637599935-1.el8

• https://bugzilla.redhat.com/show_bug.cgi?id=2018478

• Privilege escalation in Installer for CoreOS disk images
• Multiple vulnerabilities in OpenShift Container Platform 4.8