Server Side Template Injection Strings

Description

Detects SSTI attempts sent via GET requests in access logs

Query · sigma

select_method:
  cs-method: GET
keywords:
- ={{
- =%7B%7B
- =${
- =$%7B
- =<%=
- =%3C%25=
- =@(
- freemarker.template.utility.Execute
- .getClass().forName('javax.script.ScriptEngineManager')
- T(org.apache.commons.io.IOUtils)
filter:
  sc-status: 404
condition: select_method and keywords and not filter

Known false positives

  • User searches in search boxes of the respective website
  • Internal vulnerability scanners can cause some serious FPs when used, if you experience a lot of FPs due to this think of adding more filters such as "User Agent" strings and more response codes
Raw source Server Side Template Injection Strings · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Server Side Template Injection Strings
id: ada3bc4f-f0fd-42b9-ba91-e105e8af7342
status: test
description: Detects SSTI attempts sent via GET requests in access logs
references:
    - https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection
    - https://github.com/payloadbox/ssti-payloads
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-14
tags:
    - attack.stealth
    - attack.t1221
logsource:
    category: webserver
detection:
    select_method:
        cs-method: 'GET'
    keywords:
        - '={{'
        - '=%7B%7B'
        - '=${'
        - '=$%7B'
        - '=<%='
        - '=%3C%25='
        - '=@('
        - 'freemarker.template.utility.Execute'
        - .getClass().forName('javax.script.ScriptEngineManager')
        - 'T(org.apache.commons.io.IOUtils)'
    filter:
        sc-status: 404
    condition: select_method and keywords and not filter
falsepositives:
    - User searches in search boxes of the respective website
    - Internal vulnerability scanners can cause some serious FPs when used, if you experience a lot of FPs due to this think of adding more filters such as "User Agent" strings and more response codes
level: high

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