Add vpatch-CVE-2022-36446 rule and test

[crowdsec-automation]

This rule detects exploitation attempts for CVE-2022-36446, a command injection vulnerability in Webmin <1.997. The attack is performed by sending a POST request to /package-updates/update.cgi with the u parameter containing shell metacharacters (such as ;) to inject commands. The rule:

• Matches requests to the vulnerable endpoint by checking if the URI contains /package-updates/update.cgi (case-insensitive).
• Inspects the u parameter in the POST body, applying lowercase and urldecode transforms to normalize the input.
• Triggers if the u parameter contains a semicolon (;), a common shell metacharacter used for command injection.
• The rule avoids false positives by only targeting the relevant parameter and endpoint, and by not matching on the full payload or specific command strings.
• All value: fields are lowercase, and the transform includes lowercase as required. The rule uses contains for matching, as per guidelines.

[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-2022-36446 🔴

[github-actions]

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

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Mitre ATT&CK

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