Add vpatch-CVE-2025-59718 rule and test

[crowdsec-automation]

This rule detects attempts to exploit CVE-2025-59718, a Fortinet FortiCloud SSO authentication bypass. The attack works by POSTing a specially crafted, base64-encoded SAMLResponse to the /remote/saml/login endpoint. The rule:

• Matches requests to the /remote/saml/login endpoint (case-insensitive, using endsWith for precision).
• Ensures the POST body contains a parameter named SAMLResponse (case-insensitive).
• Decodes the base64-encoded value of SAMLResponse and checks for the presence of the string <saml:issuer>https://sso.forticloud.com</saml:issuer>, which is a strong indicator of the crafted SAML assertion used in the exploit PoC.
• The use of lowercase and b64decode in the transform ensures the match is robust against case and encoding variations.
• The labels section includes the correct CVE, ATT&CK, and CWE references for authentication bypass.

Validation Checklist:

• All value: fields are lowercase.
• All relevant transforms include lowercase.
• No match.value contains capital letters.
• contains is used instead of regex where applicable.
• No use of both and and or in the rule logic.

[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-2025-59718 🔴

[github-actions]

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

I'm a bot that helps maintainers to validate scenarios and ensure they include all the required information.
I've found some errors in your scenarios, please fix them and re-submit your PR, or ask for help if you need it.

The following items have errors:

crowdsecurity/crs-exclusion-plugin-cpanel:

• labels not found

crowdsecurity/crs-exclusion-plugin-dokuwiki:

• labels not found

crowdsecurity/crs-exclusion-plugin-drupal:

• labels not found

crowdsecurity/crs-exclusion-plugin-nextcloud:

• labels not found

crowdsecurity/crs-exclusion-plugin-phpbb:

• labels not found

crowdsecurity/crs-exclusion-plugin-phpmyadmin:

• labels not found

crowdsecurity/crs-exclusion-plugin-wordpress:

• labels not found

crowdsecurity/crs-exclusion-plugin-xenforo:

• labels not found

Mitre ATT&CK

Information about mitre attack can be found here.
As an example, some common mitre attack techniques:

• T1110 for bruteforce attacks
• T1595 and T1190 for exploitation of public vulnerabilities
• T1595 for generic scanning of exposed applications

Expected format is (where XXXX is the technique ID):

labels:
  classification:
    - attack.TXXXX

CVEs

If your scenario covers a specific CVE (Common Vulnerabilities and Exposures), please add it.

Expected format is (where CVE-XXX-XXX is the CVE ID):

labels:
  classification:
    - cve.CVE-XXX-XXX

Behaviors

Please identify the behavior(s) your scenario is targeting. You can find the list of available behaviors here.

Expected format is (where <behavior> is the behavior you want to target):

labels:
  behavior: <behavior>

See the labels documentation for more information.