Add vpatch-CVE-2025-27817 rule and test

[crowdsec-automation]

This rule detects exploitation attempts for CVE-2025-27817, where an attacker abuses the Druid sampler endpoint to supply a malicious Kafka configuration that references a local file via the sasl.oauthbearer.token.endpoint.url property, resulting in arbitrary file read.

• The first rule block matches requests to the /druid/indexer/v1/sampler endpoint, which is the only relevant endpoint for this attack.
• The second rule block ensures that the request body contains the parameter name sasl.oauthbearer.token.endpoint.url, indicating an attempt to set this property.
• The third rule block specifically checks if the value of sasl.oauthbearer.token.endpoint.url starts with file://, which is the vector for local file inclusion.
• All matches are performed in a case-insensitive manner by applying the lowercase transform.
• The rule avoids false positives by requiring all three conditions to be met: correct endpoint, presence of the relevant parameter, and

[github-actions]

Hello @crowdsec-automation and thank you for your contribution!

❗ It seems that the following scenarios are not part of the 'crowdsecurity/appsec-virtual-patching' collection:

🔴 crowdsecurity/vpatch-CVE-2025-27817 🔴

[github-actions]

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