Server Side Template Injection Strings

calendar Oct 17, 2023 · attack.defense_evasion attack.t1221  ·
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Detects SSTI attempts sent via GET requests in access logs

Sigma rule (View on GitHub)

 1title: Server Side Template Injection Strings
 2id: ada3bc4f-f0fd-42b9-ba91-e105e8af7342
 3status: test
 4description: Detects SSTI attempts sent via GET requests in access logs
 5references:
 6    - https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection
 7    - https://github.com/payloadbox/ssti-payloads
 8author: Nasreddine Bencherchali (Nextron Systems)
 9date: 2022/06/14
10tags:
11    - attack.defense_evasion
12    - attack.t1221
13logsource:
14    category: webserver
15detection:
16    select_method:
17        cs-method: 'GET'
18    keywords:
19        - '={{'
20        - '=%7B%7B'
21        - '=${'
22        - '=$%7B'
23        - '=<%='
24        - '=%3C%25='
25        - '=@('
26        - 'freemarker.template.utility.Execute'
27        - .getClass().forName('javax.script.ScriptEngineManager')
28        - 'T(org.apache.commons.io.IOUtils)'
29    filter:
30        sc-status: 404
31    condition: select_method and keywords and not filter
32falsepositives:
33    - User searches in search boxes of the respective website
34    - 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
35level: high

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