Cryptographic issues in Jenkins and Jenkins LTS - CVE-2020-2102

Vulnerability identifier: #VU24761

CSH Severity: Medium

CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-2102

CWE-ID: CWE-310

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to the affected software does not use a constant-time comparison when checking whether two HMACs are equal. A remote authenticated attacker can use statistical methods to obtain a valid HMAC for an attacker-controlled input value.

Jenkins
Jenkins LTS
skopeo (Red Hat package)
runc (Red Hat package)
buildah (Red Hat package)
cri-o (Red Hat package)
cri-tools (Red Hat package)
ovn2.12 (Red Hat package)
jenkins (Red Hat package)
openshift (Red Hat package)
openshift-ansible (Red Hat package)
openshift-clients (Red Hat package)
atomic-enterprise-service-catalog (Red Hat package)
machine-config-daemon (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 2.219
Jenkins LTS - update to 2.204.2
skopeo (Red Hat package) - update to 0.1.40-4.rhaos.el8
runc (Red Hat package) - update to 1.0.0-65.rc10.rhaos4.3.el8
buildah (Red Hat package) - update to 1.11.6-4.el8
cri-o (Red Hat package) - update to 1.16.3-22.dev.rhaos4.3.git11c04e3.el8
cri-tools (Red Hat package) - addressed in versions 1.17.0-1.el7, 1.17.0-2.el8
ovn2.12 (Red Hat package) - update to 2.12.0-32.el7fdn
jenkins (Red Hat package) - update to 2.204.2.1583446818-1.el7
Red Hat OpenShift Container Platform - update to 4.3.5
openshift (Red Hat package) - addressed in versions 4.3.5-202002280657.git.0.b3bfb5a.el7, 4.3.5-202002280657.git.0.b3bfb5a.el8
openshift-ansible (Red Hat package) - update to 4.3.5-202002280657.git.1.e4f02b3.el7
openshift-clients (Red Hat package) - addressed in versions 4.3.5-202002280657.git.1.55a9334.el7, 4.3.5-202002280657.git.1.55a9334.el8
atomic-enterprise-service-catalog (Red Hat package) - update to 4.3.5-202003020117.git.0.4eb885c.el7
machine-config-daemon (Red Hat package) - update to 4.3.5-202003020117.git.0.61e0e48.el8
openshift-kuryr (Red Hat package) - update to 4.3.5-202003020117.git.0.237579a.el8
atomic-openshift-service-idler (Red Hat package) - update to 4.3.5-202003020117.git.13.3ac2b0e.el7
jenkins-2-plugins (Red Hat package) - update to 4.3.1583445947-1.el7

• http://www.openwall.com/lists/oss-security/2020/01/29/1
• https://jenkins.io/security/advisory/2020-01-29/#SECURITY-1660

• Multiple vulnerabilities in Jenkins and LTS
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.3 packages