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SSTI in Flask and Jinja

SSTI in Flask and Jinja

Fuzzing vulnerable payloads in request body and query params to assess Server-Side Template Injection vulnerability.

Server Side Template Injection (SSTI)

"By fuzzing vulnerable payloads in request bodies and query parameters, it aims to identify and exploit Server-Side Template Injection vulnerabilities specific to Flask and Jinja templates. This test assesses the risk of arbitrary code execution, data exposure, and server compromise within the Jinja templating engine, ensuring comprehensive security assessment."

"By fuzzing vulnerable payloads in request bodies and query parameters, it aims to identify and exploit Server-Side Template Injection vulnerabilities specific to Flask and Jinja templates. This test assesses the risk of arbitrary code execution, data exposure, and server compromise within the Jinja templating engine, ensuring comprehensive security assessment."

Impact of the vulnerability

Impact of the vulnerability

Successful exploitation might compromise sensitive AWS information which attacker can use to get unauthorized access to AWS.

Successful exploitation might compromise sensitive AWS information which attacker can use to get unauthorized access to AWS.

How this template works

APIs Selection

The template uses regular expressions to match any request payload or query parameter key. It extracts the matched key and assigns it to the variables "payloadKey" and "queryKey" respectively.

Execute request

The template modifies the query parameter "queryKey" by injecting the value "%24%7B%277%27%20*%207%7D", which represents the expression "${'7'*7}". It also modifies the request body parameter "payloadKey" by injecting the value "${'7'*7}". These modifications aim to test for Server-Side Template Injection vulnerabilities.

Validation

The template validates the response payload by checking if it contains the string "7777777". If the response payload contains this string, it indicates a successful exploitation of the Server-Side Template Injection vulnerability.

Frequently asked questions

What is Server-Side Template Injection (SSTI) and how does it relate to Flask and Jinja templates

How does the SSTI in Flask and Jinja test identify and exploit vulnerabilities

What is the impact of a successful exploitation of the SSTI vulnerability in Flask and Jinja

What are the severity and category of this test

What are the tags associated with this test

Are there any references or resources available for further information on SSTI in Flask and Jinja

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"We are absolutely thrilled with the testing feature of Akto. We have used it on our graphQL endpoints and it performs flawlessly identifying common API security issues. It's truly a game-changer and we highly recommend Akto to anyone looking to effortlessly secure their API endpoints. With a user-friendly interface, it's the perfect solution for anyone looking to embrace custom rules with context to reduce false positives."

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Loom

"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. "

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