==================================================================== CERT-Renater Note d'Information No. 2021/VULN165 _____________________________________________________________________ DATE : 18/03/2021 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running CloudBees AWS Credentials Plugin for Jenkins, Libvirt Agents Plugin for Jenkins, Matrix Authorization Strategy Plugin for Jenkins, Role-based Authorization Strategy Plugin for Jenkins, Warnings Next Generation Plugin for Jenkins. . ===================================================================== https://www.jenkins.io/security/advisory/2021-03-18/ _____________________________________________________________________ Jenkins Security Advisory 2021-03-18 This advisory announces vulnerabilities in the following Jenkins deliverables: CloudBees AWS Credentials Plugin Libvirt Agents Plugin Matrix Authorization Strategy Plugin Role-based Authorization Strategy Plugin Warnings Next Generation Plugin Descriptions Incorrect permission checks in Matrix Authorization Strategy Plugin may allow accessing some items SECURITY-2180 / CVE-2021-21623 Items (like jobs) can be organized hierarchically in Jenkins, using the Folders Plugin or something similar. An item is expected to be accessible only if all its ancestors are accessible as well. Matrix Authorization Strategy Plugin 2.6.5 and earlier does not correctly perform permission checks to determine whether an item should be accessible. This allows attackers with Item/Read permission on nested items to access them, even if they lack Item/Read permission for parent folders. Matrix Authorization Strategy Plugin 2.6.6 requires Item/Read permission on parent items to grant Item/Read permission on an individual item. As a workaround in older releases, do not grant permissions on individual items to users who do not have access to parent items. In case of problems, the Java system property hudson.security.AuthorizationMatrixProperty.checkParentPermissions can be set to false, completely disabling this fix. Incorrect permission checks in Role-based Authorization Strategy Plugin may allow accessing some items SECURITY-2182 / CVE-2021-21624 Items (like jobs) can be organized hierarchically in Jenkins, using the Folders Plugin or something similar. An item is expected to be accessible only if all its ancestors are accessible as well. Role-based Authorization Strategy Plugin 3.1 and earlier does not correctly perform permission checks to determine whether an item should be accessible. This allows attackers with Item/Read permission on nested items to access them, even if they lack Item/Read permission for parent folders. Role-based Authorization Strategy Plugin 3.1.1 requires Item/Read permission on parent items to grant Item/Read permission on an individual item. As a workaround in older releases, do not grant permissions on individual items to users who do not have access to parent items. In case of problems, the Java system property com.michelin.cio.hudson.plugins.rolestrategy.RoleMap.checkParentPermissions can be set to false, completely disabling this fix. Missing permission checks in CloudBees AWS Credentials Plugin allows enumerating credentials IDs SECURITY-2032 / CVE-2021-21625 CloudBees AWS Credentials Plugin 1.28 and earlier does not perform a permission check in a helper method for HTTP endpoints. This allows attackers with Overall/Read permission to enumerate credentials IDs of AWS credentials stored in Jenkins if any of the following plugins are installed: Amazon Elastic Container Service (ECS) / Fargate AWS Parameter Store Build Wrapper AWS SAM Further plugins may use this helper method as well without performing a permission check themselves. Credentials IDs obtained this way can be used as part of an attack to capture the credentials using another vulnerability. CloudBees AWS Credentials Plugin 1.28.1 performs permission checks in the helper method for HTTP endpoints. Missing permission checks in Warnings Next Generation Plugin allow listing workspace contents SECURITY-2041 / CVE-2021-21626 Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation. This allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents. Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents. CSRF vulnerability in Libvirt Agents Plugin SECURITY-1764 / CVE-2021-21627 Libvirt Agents Plugin 1.9.0 and earlier does not require POST requests for a form submission endpoint, resulting in a cross-site request forgery (CSRF) vulnerability. This vulnerability allows attackers to stop hypervisor domains. Libvirt Agents Plugin 1.9.1 requires POST requests for the affected HTTP endpoint. Severity SECURITY-1764: Medium SECURITY-2032: Medium SECURITY-2041: Medium SECURITY-2180: Medium SECURITY-2182: Medium Affected Versions CloudBees AWS Credentials Plugin up to and including 1.28 Libvirt Agents Plugin up to and including 1.9.0 Matrix Authorization Strategy Plugin up to and including 2.6.5 Role-based Authorization Strategy Plugin up to and including 3.1 Warnings Next Generation Plugin up to and including 8.4.4 Fix CloudBees AWS Credentials Plugin should be updated to version 1.28.1 Libvirt Agents Plugin should be updated to version 1.9.1 Matrix Authorization Strategy Plugin should be updated to version 2.6.6 Role-based Authorization Strategy Plugin should be updated to version 3.1.1 Warnings Next Generation Plugin should be updated to version 8.5.0 These versions include fixes to the vulnerabilities described above. All prior versions are considered to be affected by these vulnerabilities unless otherwise indicated. Credit The Jenkins project would like to thank the reporters for discovering and reporting these vulnerabilities: Daniel Beck, CloudBees, Inc. for SECURITY-2032, SECURITY-2041, SECURITY-2182 Wadeck Follonier, CloudBees, Inc. for SECURITY-1764 ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23/25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email:cert@support.renater.fr + =========================================================