Add vpatch-CVE-2023-29357 rule and test

[crowdsec-automation]

This rule detects attempts to exploit CVE-2023-29357, an authentication bypass in Microsoft SharePoint where attackers forge JWT tokens using the "none" algorithm. The detection logic is as follows:

• The first rule ensures the request targets the SharePoint API endpoint /api/web/siteusers, which is the focus of the exploit.
• The second rule checks for the presence of an Authorization header containing the string bearer (case-insensitive), indicating a bearer token is being used.
• The third rule further inspects the Authorization header for the substring none, which is characteristic of JWT tokens using the "none" algorithm (i.e., unsigned tokens), a key part of this exploit.

All value: fields are lowercase, and the lowercase transform is applied to ensure case-insensitive matching. The rule avoids false positives by focusing on the specific endpoint and the unique use of the "none" algorithm in the Authorization header. No regex or unnecessary complexity is used, and the rule is optimized for minimal false positives and negatives. The test nuclei template is adapted to expect a 403 response, as required.

[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-2023-29357 🔴

[github-actions]

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