SSTI in Freemarker
Fuzzing vulnerable payloads in request body and query params to assess Server-Side Template Injection vulnerability.
Server Side Template Injection (SSTI)
How this template works
APIs Selection
The template uses regular expressions to match any request payload or query parameter key. It then extracts the matched key and assigns it to either "payloadKey" or "queryKey" for further use.
Execute request
The template modifies the query parameter "queryKey" by injecting the value "%24%7B89%20*%2091%7D", which represents the expression "${89*91}". Similarly, it modifies the request body parameter "payloadKey" by injecting the expression "${89*91}". These modifications aim to test for Server-Side Template Injection vulnerabilities.
Validation
The template validates the response payload by checking if it contains either the string "8099". This ensures that the executed request has successfully triggered the expected behavior related to Server-Side Template Injection.
Frequently asked questions
What is Server-Side Template Injection (SSTI) and how does it pose a security risk in the context of FreeMarker templates
How does the SSTI_IN_FREEMARKER test identify and exploit Server-Side Template Injection vulnerabilities specific to FreeMarker templates
What are the potential impacts of a successful Server-Side Template Injection attack, including the risks of arbitrary code execution, data exposure, and server compromise
How does the test modify the request payload and query parameters to fuzz vulnerable payloads and assess the presence of SSTI vulnerabilities
What are the specific selection filters used in the test to identify relevant request payloads and query parameters for fuzzing
How does the test validate the response payload to determine if the SSTI vulnerability has been successfully exploited, specifically looking for the presence of the value '8099'
"The text editor in Akto is absolutely remarkable. Its user-friendly YAML format strikes the perfect balance between simplicity and power. With intuitive features like 'API selection filter', 'Execute', Validate' creating test rules becomes incredibly easy. Akto's test editor is a game-changer, enabling seamless creation of highly personalized and effective tests that could meet the needs of any modern day organization. "
Security team,
Rippling
