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Jenkins <=2.218 - Information Disclosure

ID: CVE-2020-2103

Severity: medium

Author: c-sh0

Tags: cve,cve2020,jenkins

Description

Section titled “Description”

Jenkins through 2.218, LTS 2.204.1 and earlier, is susceptible to information disclosure. An attacker can access exposed session identifiers on a user detail object in the whoAmI diagnostic page and thus potentially access sensitive information, modify data, and/or execute unauthorized operations.

YAML Source

Section titled “YAML Source”
id: CVE-2020-2103


info:
  name: Jenkins <=2.218 - Information Disclosure
  author: c-sh0
  severity: medium
  description: Jenkins through 2.218, LTS 2.204.1 and earlier, is susceptible to information disclosure. An attacker can access exposed session identifiers on a user detail object in the whoAmI diagnostic page and thus potentially access sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to gain sensitive information from the Jenkins server.
  remediation: |
    Upgrade Jenkins to a version higher than 2.218 to mitigate the vulnerability.
  reference:
    - https://www.jenkins.io/security/advisory/2020-01-29/#SECURITY-1695
    - https://jenkins.io/security/advisory/2020-01-29/#SECURITY-1695
    - http://www.openwall.com/lists/oss-security/2020/01/29/1
    - https://nvd.nist.gov/vuln/detail/CVE-2020-2103
    - https://access.redhat.com/errata/RHBA-2020:0402
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 5.4
    cve-id: CVE-2020-2103
    cwe-id: CWE-200
    epss-score: 0.00527
    epss-percentile: 0.76943
    cpe: cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
  metadata:
    max-request: 2
    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: cve,cve2020,jenkins


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


    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - 'text/html'
          - 'x-jenkins'
        case-insensitive: true
        condition: and


      - type: word
        part: body_2
        words:
          - 'Cookie'
          - 'SessionId: null'
        condition: and


      - type: status
        status:
          - 200


    extractors:
      - type: kval
        kval:
          - x_jenkins
# digest: 4a0a004730450220426b9169ebc68df24f2086caaa508ffbd01d292c24802eadd34449211e973ec7022100a1edbffe277c13eeb878ff9abf6750ca17d455d54a296518e03691b76f5dc45e: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/2020/CVE-2020-2103.yaml"

View on Github