Permissions, Privileges, and Access Controls in Jenkins and Jenkins LTS - CVE-2021-21606

Vulnerability identifier: #VU49529

CSH Severity: Low

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

CVE-ID: CVE-2021-21606

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to arbitrary file existence check in file fingerprints. A remote authenticated attacker can check for the existence of XML files on the controller file system where the relative path can be constructed as 32 characters.

Jenkins
Jenkins LTS
Arch Linux
runc (Red Hat package)
cri-o (Red Hat package)
jenkins (Red Hat package)
conmon (Red Hat package)
jenkins (Alpine package)
python-rsa (Red Hat package)
openshift (Red Hat package)
machine-config-daemon (Red Hat package)
openshift-ansible (Red Hat package)
openshift-clients (Red Hat package)
openshift-kuryr (Red Hat package)
atomic-openshift-service-idler (Red Hat package)
jenkins-2-plugins (Red Hat package)
Red Hat OpenShift Container Platform

Install updates from vendor's website.

Jenkins - update to 2.275
Jenkins LTS - update to 2.263.2
runc (Red Hat package) - addressed in versions 1.0.0-72.rhaos4.5.giteadfc6b.el8, 1.0.0-82.rhaos4.6.git086e841.el7, 1.0.0-82.rhaos4.6.git086e841.el8
cri-o (Red Hat package) - update to 1.19.1-7.rhaos4.6.git6377f68.el7
jenkins (Red Hat package) - addressed in versions 2.263.3.1612434332-1.el7, 2.263.3.1612434510-1.el8
conmon (Red Hat package) - addressed in versions 2.0.21-1.rhaos4.5.el7, 2.0.21-1.rhaos4.5.el8
jenkins (Alpine package) - update to 2.275-r0
python-rsa (Red Hat package) - update to 4.7-1.el8
openshift (Red Hat package) - addressed in versions 4.5.0-202102050524.p0.git.0.9229406.el7, 4.5.0-202102050524.p0.git.0.9229406.el8, 4.6.0-202102050212.p0.git.94265.716fcf8.el7, 4.6.0-202102050212.p0.git.94265.716fcf8.el8
machine-config-daemon (Red Hat package) - update to 4.5.0-202102050524.p0.git.2594.ff3b8c0.el8
openshift-ansible (Red Hat package) - addressed in versions 4.5.0-202102031005.p0.git.0.c6839a2.el7, 4.6.0-202102031649.p0.git.0.bf90f86.el7
openshift-clients (Red Hat package) - addressed in versions 4.5.0-202102051529.p0.git.3612.61b096a.el7, 4.5.0-202102051529.p0.git.3612.61b096a.el8, 4.6.0-202102050644.p0.git.3831.1c61c6b.el7, 4.6.0-202102050644.p0.git.3831.1c61c6b.el8
Red Hat OpenShift Container Platform - addressed in versions 4.5.33, 4.6.17
openshift-kuryr (Red Hat package) - update to 4.6.0-202102031810.p0.git.2225.a3ab872.el8
atomic-openshift-service-idler (Red Hat package) - update to 4.6.0-202102031810.p0.git.15.dcab90a.el8
jenkins-2-plugins (Red Hat package) - update to 4.6.1612257979-1.el8

• https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023

• Multiple vulnerabilities in Jenkins and Jenkins LTS
• Permissions, Privileges, and Access Controls in jenkins (Alpine package)
• Arch Linux update for jenkins
• Multiple vulnerabilities in OpenShift Container Platform
• Multiple vulnerabilities in OpenShift Container Platform