Oracle Access Manager - Remote Code Execution

Exploited in the wild. Listed by CISA on 2022-11-28; known to be used by ransomware.

criticalseverity

9.8CVSS score

96.3%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

The Oracle Access Manager portion of Oracle Fusion Middleware (component: OpenSSO Agent) is vulnerable to remote code execution. Supported versions that are affected are 11.1.2.3.0, 12.2.1.3.0 and 12.2.1.4.0. This is an easily exploitable vulnerability that allows unauthenticated attackers with network access via HTTP to compromise Oracle Access Manager.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.

Fix

Apply the latest security patches provided by Oracle to mitigate this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/oam/server/opensso/sessionservice
Positive when: contains in header "x-oracle-dms-ecid" or "x-oracle-dms-rid" AND contains "/oam/pages/css/general.css" AND status 200

Run it with nuclei: nuclei -id CVE-2021-35587 -u <target>

The full check

id: CVE-2021-35587

info:
  name: Oracle Access Manager - Remote Code Execution
  author: cckuailong
  severity: critical
  description: |
    The Oracle Access Manager  portion of Oracle Fusion Middleware (component: OpenSSO Agent) is vulnerable to remote code execution. Supported versions that are affected are 11.1.2.3.0, 12.2.1.3.0 and 12.2.1.4.0. This is an easily exploitable vulnerability that allows unauthenticated attackers with network access via HTTP to compromise Oracle Access Manager.
  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://testbnull.medium.com/oracle-access-manager-pre-auth-rce-cve-2021-35587-analysis-1302a4542316
    - https://nvd.nist.gov/vuln/detail/CVE-2021-35587
    - https://www.oracle.com/security-alerts/cpujan2022.html
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/GrrrDog/Java-Deserialization-Cheat-Sheet
  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-2021-35587
    cwe-id: CWE-502
    epss-score: 0.96284
    epss-percentile: 0.99878
    cpe: cpe:2.3:a:oracle:access_manager:11.1.2.3.0:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: oracle
    product: access_manager
    shodan-query:
      - http.title:"Oracle Access Management"
      - http.title:"oracle access management"
      - http.html:"/oam/pages/css/login_page.css"
    fofa-query:
      - body="/oam/pages/css/login_page.css"
      - title="oracle access management"
    google-query: intitle:"oracle access management"
  tags: cve2021,cve,oam,rce,java,unauth,oracle,kev,vkev,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/oam/server/opensso/sessionservice'

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "x-oracle-dms-ecid"
          - "x-oracle-dms-rid"
        case-insensitive: true
        condition: or

      - type: word
        part: body
        words:
          - "/oam/pages/css/general.css"

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from