==================================================================== CERT-Renater Note d'Information No. 2018/VULN049 _____________________________________________________________________ DATE : 13/02/2018 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Android Lint Plugin for Jenkins, CCM Plug-in for Jenkins, Credentials Binding Plugin for Jenkins, JUnit Plugin for Jenkins, Pipeline: Supporting APIs for Jenkins, Ant Plugin for Jenkins, Checkstyle Plug-in for Jenkins, DRY Plug-in for Jenkins, FindBugs Plug-in for Jenkins, Jenkins Release Plugin for Jenkins, Jenkins Translation Assistance plugin for Jenkins, PMD Plug-in for Jenkins, Pipeline: Nodes and Processes for Jenkins, Warnings Plug-in for Jenkins. ===================================================================== https://jenkins.io/security/advisory/2018-02-05/ https://jenkins.io/security/advisory/2018-01-22/ _____________________________________________________________________ Jenkins Security Advisory 2018-02-05 This advisory announces vulnerabilities in the following Jenkins deliverables: Android Lint Plugin CCM Plug-in Credentials Binding Plugin JUnit Plugin Pipeline: Supporting APIs Description XXE vulnerabilities in multiple static analysis plugins SECURITY-659 / CVE-2018-1000054 (CCM) SECURITY-660 / CVE-2018-1000055 (Android Lint) Multiple plugins based on Static Analysis Utilities plugin are affected by an XML External Entity (XXE) processing vulnerability. This allows an attacker to configure build processes such that one of these plugins parses a maliciously crafted file that uses external entities for extraction of secrets from the Jenkins master, server-side request forgery, or denial-of-service attacks. External entity resolution has been disabled for these plugins. XXE vulnerability in JUnit plugin SECURITY-521 / CVE-2018-1000056 JUnit plugin is affected by an XML External Entity (XXE) processing vulnerability. This allows an attacker to configure build processes such that JUnit plugin parses a maliciously crafted file that uses external entities for extraction of secrets from the Jenkins master, server-side request forgery, or denial-of-service attacks. External entity resolution has been adjusted to avoid XXE and still satisfy the existing features. Credentials Binding plugin did not mask the secret actually provided to the build in rare circumstances SECURITY-698 / CVE-2018-1000057 Credentials Binding plugin allows specifying passwords and other secrets as environment variables, and will hide them from console output in builds. However, since Jenkins will try to resolve references to other environment variables in environment variables passed to a build, this can result in other values than the one specified being provided to a build. For example, the value p4$$w0rd would result in Jenkins passing on p4$w0rd, as $$ is the escape sequence for a single $. Credentials Binding plugin does not prevent such a transformed value (e.g. p4$w0rd) from being shown on the build log, allowing users to reconstruct the actual password value from the transformed one. Credentials Binding plugin will now escape any $ characters in password values so they are correctly passed to the build. This issue did apply to freestyle and other classic job types, but does not apply to Pipelines. Arbitrary code execution due to incomplete sandbox protection in Pipeline: Supporting APIs Plugin SECURITY-699 / CVE-2018-1000058 Pipelines are subject to script security: Either the entire Pipeline needs to be approved, or it runs in a sandbox, with only whitelisted methods etc. allowed to be called. Methods related to Java deserialization like readResolve implemented in Pipeline scripts were not subject to sandbox protection, and could therefore execute arbitrary code. This could be exploited e.g. by regular Jenkins users with the permission to configure Pipelines in Jenkins, or by trusted committers to repositories containing Jenkinsfiles. Deserialization of objects in Pipeline is now also subject to sandbox protection. This change may cause existing scripts relying on the incomplete sandbox protection to start failing, and requiring additional script approval. This change requires that Pipeline: Groovy plugin is also updated to version 2.44, otherwise Pipeline builds using untrusted (folder-scoped) libraries will not be able to resume after a Jenkins master restart. Severity Affected Versions Android Lint Plugin up to and including 2.5 CCM Plug-in up to and including 3.1 Credentials Binding Plugin up to and including 1.14 JUnit Plugin up to and including 1.23 Pipeline: Supporting APIs up to and including 2.17 Fix Android Lint Plugin should be updated to version 2.6 CCM Plug-in should be updated to version 3.2 Credentials Binding Plugin should be updated to version 1.15 JUnit Plugin should be updated to version 1.24 Pipeline: Supporting APIs should be updated to version 2.18 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: Adith Sudhakar for SECURITY-659, SECURITY-660 Aleksandr Kazakov for SECURITY-699 James Nord, CloudBees, Inc. for SECURITY-521 Other Resources Announcement blog post _____________________________________________________________________ Jenkins Security Advisory 2018-01-22 This advisory announces vulnerabilities in the following Jenkins deliverables: Ant Plugin Checkstyle Plug-in DRY Plug-in FindBugs Plug-in Jenkins Release Plugin Jenkins Translation Assistance plugin PMD Plug-in Pipeline: Nodes and Processes Warnings Plug-in Description XXE vulnerabilities in multiple static analysis plugins SECURITY-655 / CVE-2018-1000008 (PMD) SECURITY-656 / CVE-2018-1000009 (Checkstyle) SECURITY-657 / CVE-2018-1000010 (DRY) SECURITY-658 / CVE-2018-1000011 (FindBugs) SECURITY-695 / CVE-2018-1000012 (Warnings) Multiple plugins based on Static Analysis Utilities plugin are affected by an XML External Entity (XXE) processing vulnerability. This allows attacker to configure build processes such that one of these plugins parses a maliciously crafted file that uses external entities for extraction of secrets from the Jenkins master, server-side request forgery, or denial-of-service attacks. External entity resolution has been disabled for these plugins. CSRF vulnerability in Release plugin SECURITY-607 / CVE-2018-1000013 Release plugin did not require form submissions to be submitted via POST, resulting in a CSRF vulnerability allowing attackers to trigger release builds. Access to the form action URL now requires POST. CSRF vulnerability in Translation Assistance plugin SECURITY-507 / CVE-2018-1000014 Translation Assistance plugin did not require form submissions to be submitted via POST, resulting in a CSRF vulnerability allowing attackers to override localized strings displayed to all users on the current Jenkins instance if the victim is a Jenkins administrator. Access to the form action URL now requires POST. Incorrect permission checks in Pipeline: Nodes and Processes plugin allows executing builds on agents while lacking Computer/Build permission SECURITY-675 / CVE-2018-1000015 On instances with Authorize Project plugin, the authentication associated with a build may lack the Computer/Build permission on some agents. This did not prevent the execution of node blocks on those agents due to incorrect permissions checks in Pipeline: Nodes and Processes plugin. Build permissions on agents are now properly enforced for node steps. XSS vulnerability in job configuration forms in Ant plugin SECURITY-624 and SECURITY-694 Ant plugin failed to escape tool names it shows on job configuration screens, resulting in a cross-site scripting (XSS) vulnerability that is exploitable only by Jenkins administrators. This is the same vulnerability that was announced without a fix on 2017-12-05. Contrary to what we wrote in that security advisory, Ant Plugin shows both the JDK and Ant tools on the configuration screen, and the vulnerability in Ant plugin was responsible for both problems we confirmed in the previous advisory. Ant plugin now correctly escapes tool names shown on the job configuration screen. Severity Affected Versions Ant Plugin up to and including 1.7 Checkstyle Plug-in up to and including 3.49 DRY Plug-in up to and including 2.49 FindBugs Plug-in up to and including 4.71 Jenkins Release Plugin up to and including 2.9 Jenkins Translation Assistance plugin up to and including 1.15 PMD Plug-in up to and including 1.7 Pipeline: Nodes and Processes up to and including 2.17 Warnings Plug-in up to and including 4.64 Fix Ant Plugin should be updated to version 1.8 Checkstyle Plug-in should be updated to version 3.5 DRY Plug-in should be updated to version 2.5 FindBugs Plug-in should be updated to version 4.72 Jenkins Release Plugin should be updated to version 2.1 Jenkins Translation Assistance plugin should be updated to version 1.16 PMD Plug-in should be updated to version 1.8 Pipeline: Nodes and Processes should be updated to version 2.18 Warnings Plug-in should be updated to version 4.65 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: Adith Sudhakar for SECURITY-655, SECURITY-656, SECURITY-657, SECURITY-658 Jesse Glick, CloudBees, Inc. for SECURITY-607, SECURITY-675 Oleg Nenashev, CloudBees, Inc. for SECURITY-507 ========================================================== + 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 + ==========================================================